Advances in near-real-time forecasts of lava flow advance rates, final travel distance, and areal coverage are transforming hazard response, particularly in locations such as Hawaiʻi that experience frequent lava flow activity. The most severe threats are posed by rapidly advancing channelized ʻaʻā flows, such as those that characterized the November–December 2022 eruption of Mauna Loa volcano. To constrain rheological inputs to flow forecasting models during the eruption, samples were collected from the two most persistent lava flows and rapidly assessed for downflow changes in crystallinity and vesicularity. As observed in other channelized lava flows, the lava lost bubbles and cooled during transport, with consequent increases in groundmass crystallinity and bulk viscosity. Lava rheology, however, is controlled by more than bulk bubble and crystal contents; also important are the melt viscosity and the size and shape distributions of bubbles and crystals. Here we further interrogate the sample suite to document a down flow increase of almost two orders of magnitude in melt viscosity alone (a function of cooling combined with compositional change) and assess the extreme anisotropy of the plagioclase crystals as a function of size and flow type (pāhoehoe or ʻaʻā). When combined with previous studies, these data constrain observed relations between surface morphology, flow temperature and crystal content and indicate that remote assessments of morphological transitions and core lava temperature could be used for channel-wide monitoring of rheological evolution for assimilation into flow models.
","language":"English","publisher":"Springer","doi":"10.1007/s00445-026-01979-5","usgsCitation":"Cashman, K.V., Andrews, B.J., and Dietterich, H., 2026, Syn-emplacement crystallization of Mauna Loa 2022 lava flows, Hawaiʻi: Bulletin of Volcanology, v. 88, 59, 20 p., https://doi.org/10.1007/s00445-026-01979-5.","productDescription":"59, 20 p.","ipdsId":"IP-186451","costCenters":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"links":[{"id":505836,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Hawaii","otherGeospatial":"Mauna Loa","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -155.57,\n 19.7\n ],\n [\n -155.45,\n 19.7\n ],\n [\n -155.45,\n 19.5\n ],\n [\n -155.57,\n 19.5\n ],\n [\n -155.57,\n 19.7\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"88","noUsgsAuthors":false,"publicationDate":"2026-05-08","publicationStatus":"PW","contributors":{"authors":[{"text":"Cashman, Katharine V.","contributorId":372743,"corporation":false,"usgs":false,"family":"Cashman","given":"Katharine","middleInitial":"V.","affiliations":[{"id":6604,"text":"University of Oregon","active":true,"usgs":false}],"preferred":false,"id":963511,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Andrews, Benjamin J.","contributorId":372744,"corporation":false,"usgs":false,"family":"Andrews","given":"Benjamin","middleInitial":"J.","affiliations":[{"id":36606,"text":"Smithsonian Institution","active":true,"usgs":false}],"preferred":false,"id":963512,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Dietterich, Hannah R. 0000-0001-7898-4343","orcid":"https://orcid.org/0000-0001-7898-4343","contributorId":212771,"corporation":false,"usgs":true,"family":"Dietterich","given":"Hannah R.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":963513,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70276759,"text":"70276759 - 2026 - Can surface treatments and climate matching enhance restoration success in the Sonoran Desert?","interactions":[],"lastModifiedDate":"2026-06-22T15:17:06.82773","indexId":"70276759","displayToPublicDate":"2026-05-08T10:03:05","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3271,"text":"Restoration Ecology","active":true,"publicationSubtype":{"id":10}},"title":"Can surface treatments and climate matching enhance restoration success in the Sonoran Desert?","docAbstract":"Restoring native plant communities in arid ecosystems through seeding is a critical yet often unsuccessful strategy due to severe environmental stressors, including degraded soils, low and variable rainfall, and seed predation.
To improve restoration outcomes, we examined the influence of seed mix types and soil surface treatments on seeded and unseeded plant establishment across three Sonoran Desert sites, Arizona, United States.
Using a factorial design, we tested two seed mix types (cool versus warm adapted species) and four soil surface treatments (pits, mulch, connectivity modifiers or ConMods, and controls) on plant establishment. We examined if patterns of plant establishment could be predicted by whether the climate envelope of species in the seed mix types was similar to the site climate where they were seeded (climate matching). We monitored seeded and unseeded species establishment for 3 years and analyzed these effects using generalized linear mixed models and Tukey-adjusted multiple comparisons.
Pit treatments significantly enhanced seeded species density by nearly 3× and cover by 2× compared with ConMods and increased unseeded plant density by 2× to 4× times during post-drought springs. During these same seasons, species suited to cooler temperatures (e.g. Salvia columbariae and Lupinus sparsiflorus) had higher cover at the site receiving the highest precipitation, and species suited to warmer temperatures (e.g. Sphaeralcea ambigua and Senna covesii) established better at the drier two sites.
In arid systems, surface treatments like pits that retain soil moisture were most promising for supporting seed-based restoration, and matching species that have high temperature tolerance with hotter, drier sites may enhance restoration success.
","language":"English","publisher":"Wiley","doi":"10.1111/rec.70429","usgsCitation":"Lyu, S., Rowe, H.I., Broatch, J., Brady, J.X., Fastiggi, M., Fitts, S., Langenfeld, D., and Munson, S.M., 2026, Can surface treatments and climate matching enhance restoration success in the Sonoran Desert?: Restoration Ecology, https://doi.org/10.1111/rec.70429.","ipdsId":"IP-186075","costCenters":[{"id":568,"text":"Southwest Biological Science Center","active":true,"usgs":true}],"links":[{"id":505716,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Arizona","otherGeospatial":"Lake Pleasant, McDowell-Sonoran Preserve, Roosevelt Lake","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -112.51689217827725,\n 33.9992955\n ],\n [\n -110.8598752,\n 33.9992955\n ],\n [\n -110.8598752,\n 32.939696998087726\n ],\n [\n -112.51689217827725,\n 32.939696998087726\n ],\n [\n -112.51689217827725,\n 33.9992955\n ]\n ]\n ]\n }\n }\n ]\n}","edition":"Online First","noUsgsAuthors":false,"publicationDate":"2026-05-08","publicationStatus":"PW","contributors":{"authors":[{"text":"Lyu, Shumin","contributorId":372582,"corporation":false,"usgs":false,"family":"Lyu","given":"Shumin","affiliations":[{"id":88373,"text":"New College of Interdisciplinary Arts and Sciences, Arizona State University, Glendale, AZ 85306 USA","active":true,"usgs":false}],"preferred":false,"id":963275,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Rowe, Helen I.","contributorId":372583,"corporation":false,"usgs":false,"family":"Rowe","given":"Helen","middleInitial":"I.","affiliations":[{"id":88374,"text":"School of Earth and Sustainability, Northern Arizona University, Flagstaff, AZ 86011 USA","active":true,"usgs":false}],"preferred":false,"id":963276,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Broatch, Jennifer","contributorId":372584,"corporation":false,"usgs":false,"family":"Broatch","given":"Jennifer","affiliations":[{"id":88373,"text":"New College of Interdisciplinary Arts and Sciences, Arizona State University, Glendale, AZ 85306 USA","active":true,"usgs":false}],"preferred":false,"id":963277,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Brady, Jane X.","contributorId":372585,"corporation":false,"usgs":false,"family":"Brady","given":"Jane","middleInitial":"X.","affiliations":[{"id":88375,"text":"McDowell Sonoran Conservancy Citizen Science Program, Scottsdale, AZ","active":true,"usgs":false}],"preferred":false,"id":963278,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Fastiggi, Mary","contributorId":372637,"corporation":false,"usgs":false,"family":"Fastiggi","given":"Mary","affiliations":[],"preferred":false,"id":963335,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Fitts, Sharon","contributorId":372586,"corporation":false,"usgs":false,"family":"Fitts","given":"Sharon","affiliations":[{"id":88373,"text":"New College of Interdisciplinary Arts and Sciences, Arizona State University, Glendale, AZ 85306 USA","active":true,"usgs":false}],"preferred":false,"id":963279,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Langenfeld, Debbie","contributorId":372587,"corporation":false,"usgs":false,"family":"Langenfeld","given":"Debbie","affiliations":[{"id":88376,"text":"McDowell Sonoran Conservancy Citizen Science Program, Scottsdale, Arizona","active":true,"usgs":false}],"preferred":false,"id":963280,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Munson, Seth M. 0000-0002-2736-6374 smunson@usgs.gov","orcid":"https://orcid.org/0000-0002-2736-6374","contributorId":1334,"corporation":false,"usgs":true,"family":"Munson","given":"Seth","email":"smunson@usgs.gov","middleInitial":"M.","affiliations":[{"id":568,"text":"Southwest Biological Science Center","active":true,"usgs":true},{"id":411,"text":"National Climate Change and Wildlife Science Center","active":true,"usgs":true}],"preferred":true,"id":963281,"contributorType":{"id":1,"text":"Authors"},"rank":8}]}} ,{"id":70275789,"text":"70275789 - 2026 - Landscape connectivity and wildlife access to water across an international border: Barriers and opportunities for facilitating transboundary movement","interactions":[],"lastModifiedDate":"2026-05-19T13:56:31.436489","indexId":"70275789","displayToPublicDate":"2026-05-08T08:50:54","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1837,"text":"Global Change Biology","active":true,"publicationSubtype":{"id":10}},"title":"Landscape connectivity and wildlife access to water across an international border: Barriers and opportunities for facilitating transboundary movement","docAbstract":"Rapid global acceleration in the construction of physical barriers along international borders has greatly influenced biodiversity and animal movement. Physical barriers can fragment landscapes, hinder access to essential resources, impact long-distance migrations, and inhibit dispersal and gene flow. The effects of physical barriers on animal movement and landscape connectivity can be exacerbated in dryland environments where access to water is a limiting factor. In recent decades, the construction of border barrier infrastructure has accelerated along the international boundary between the United States and Mexico. Here, we used a landscape connectivity model to investigate the effects of barriers on wildlife access to the river in the Lower Rio Grande Valley. We used a modified omnidirectional connectivity model to compare access to the river for three large, terrestrial mammal species across three border barrier scenarios: (1) a landscape without border barriers; (2) a landscape with the existing barrier system; and (3) a potential future landscape with a continuous barrier system. The existing barrier system includes many discrete sections of barrier within tracts of the Lower Rio Grande Valley National Wildlife Refuge or on lands associated with the region's flood control system. Our results indicate that the existing border barriers can impede connectivity and wildlife access to the river in some areas, while some existing gaps between border barrier sections can serve as conduits for wildlife movement and river access. Our future scenario results show how a potential continuous border barrier system could further impede wildlife access to the river. We discuss management and landscape conservation options for enhancing wildlife access to water and riverine habitats. Collectively, our results illustrate the potential effects of border barriers on wildlife movement and access to water, providing information that can be used to better anticipate and lessen the ecological impacts of transboundary barriers.
","language":"English","publisher":"Wiley","doi":"10.1111/gcb.70888","usgsCitation":"Chivoiu, B., Koen, E.L., Osland, M., Gabler, C.A., Garrett, J.T., Reyes, E., Bilodeau, S.A., Sternberg, M.A., Villarreal, M.L., Waller, E.K., Chambers, S.N., Benavides, J.A., Lawson, R.S., and Martinez, J., 2026, Landscape connectivity and wildlife access to water across an international border: Barriers and opportunities for facilitating transboundary movement: Global Change Biology, v. 32, no. 5, e70888, 16 p., https://doi.org/10.1111/gcb.70888.","productDescription":"e70888, 16 p.","ipdsId":"IP-178984","costCenters":[{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true}],"links":[{"id":504648,"rank":2,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC13155767/","text":"External Repository"},{"id":504577,"rank":1,"type":{"id":30,"text":"Data Release"},"url":"https://doi.org/10.5066/P1KT9Y3A","text":"USGS data release","linkHelpText":"Land cover dataset for the Lower Rio Grande Valley (2023)"},{"id":504576,"rank":0,"type":{"id":30,"text":"Data Release"},"url":"https://doi.org/10.5066/P16WUBDY","text":"USGS data release","linkHelpText":"Modeling data for landscape connectivity and wildlife access to water across an international border"},{"id":504522,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Mexico, United States","state":"Tamaulipas, Texas","otherGeospatial":"Rio Grande","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -99.31616506764966,\n 26.756446591259376\n ],\n [\n -97.12393085477446,\n 26.756446591259376\n ],\n [\n -97.12393085477446,\n 25.753367645592732\n ],\n [\n -99.31616506764966,\n 25.753367645592732\n ],\n [\n -99.31616506764966,\n 26.756446591259376\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"32","issue":"5","noUsgsAuthors":false,"publicationDate":"2026-05-08","publicationStatus":"PW","contributors":{"authors":[{"text":"Chivoiu, Bogdan 0000-0002-4568-3496","orcid":"https://orcid.org/0000-0002-4568-3496","contributorId":141229,"corporation":false,"usgs":false,"family":"Chivoiu","given":"Bogdan","affiliations":[{"id":13722,"text":"University of Louisiana-Lafayette","active":true,"usgs":false}],"preferred":false,"id":961769,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Koen, Erin L. 0000-0001-9481-7692","orcid":"https://orcid.org/0000-0001-9481-7692","contributorId":330539,"corporation":false,"usgs":false,"family":"Koen","given":"Erin","email":"","middleInitial":"L.","affiliations":[{"id":78927,"text":"Cherokee Nation Systems Solutions","active":true,"usgs":false}],"preferred":false,"id":961770,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Osland, Michael 0000-0001-9902-8692","orcid":"https://orcid.org/0000-0001-9902-8692","contributorId":219650,"corporation":false,"usgs":true,"family":"Osland","given":"Michael","affiliations":[{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true}],"preferred":true,"id":961771,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Gabler, Christopher A. 0000-0001-9311-7248","orcid":"https://orcid.org/0000-0001-9311-7248","contributorId":371394,"corporation":false,"usgs":false,"family":"Gabler","given":"Christopher","middleInitial":"A.","affiliations":[{"id":88132,"text":"University of Texas Rio Grande Valley, Brownsville, TX","active":true,"usgs":false}],"preferred":false,"id":961772,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Garrett, Jerald T.","contributorId":371395,"corporation":false,"usgs":false,"family":"Garrett","given":"Jerald","middleInitial":"T.","affiliations":[{"id":88132,"text":"University of Texas Rio Grande Valley, Brownsville, TX","active":true,"usgs":false}],"preferred":false,"id":961773,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Reyes, Ernesto","contributorId":371396,"corporation":false,"usgs":false,"family":"Reyes","given":"Ernesto","affiliations":[{"id":88133,"text":"U.S. Fish and Wildlife Service, Alamo, TX","active":true,"usgs":false}],"preferred":false,"id":961774,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Bilodeau, Stephanie A. 0009-0008-0881-059X","orcid":"https://orcid.org/0009-0008-0881-059X","contributorId":371397,"corporation":false,"usgs":false,"family":"Bilodeau","given":"Stephanie","middleInitial":"A.","affiliations":[{"id":88133,"text":"U.S. Fish and Wildlife Service, Alamo, TX","active":true,"usgs":false}],"preferred":false,"id":961775,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Sternberg, Mitch A. 0009-0003-0028-2669","orcid":"https://orcid.org/0009-0003-0028-2669","contributorId":371398,"corporation":false,"usgs":false,"family":"Sternberg","given":"Mitch","middleInitial":"A.","affiliations":[{"id":88133,"text":"U.S. Fish and Wildlife Service, Alamo, TX","active":true,"usgs":false}],"preferred":false,"id":961776,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Villarreal, Miguel L. 0000-0003-0720-1422 mvillarreal@usgs.gov","orcid":"https://orcid.org/0000-0003-0720-1422","contributorId":214980,"corporation":false,"usgs":true,"family":"Villarreal","given":"Miguel","email":"mvillarreal@usgs.gov","middleInitial":"L.","affiliations":[{"id":657,"text":"Western Geographic Science Center","active":true,"usgs":true}],"preferred":true,"id":961777,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Waller, Eric K. 0000-0002-9169-9210","orcid":"https://orcid.org/0000-0002-9169-9210","contributorId":203496,"corporation":false,"usgs":true,"family":"Waller","given":"Eric","email":"","middleInitial":"K.","affiliations":[{"id":433,"text":"National Phenology Network","active":true,"usgs":true},{"id":657,"text":"Western Geographic Science Center","active":true,"usgs":true}],"preferred":true,"id":961778,"contributorType":{"id":1,"text":"Authors"},"rank":10},{"text":"Chambers, Samuel N. 0000-0002-4734-2855","orcid":"https://orcid.org/0000-0002-4734-2855","contributorId":371399,"corporation":false,"usgs":false,"family":"Chambers","given":"Samuel","middleInitial":"N.","affiliations":[{"id":6607,"text":"Arizona State University","active":true,"usgs":false}],"preferred":false,"id":961779,"contributorType":{"id":1,"text":"Authors"},"rank":11},{"text":"Benavides, Jude A.","contributorId":371400,"corporation":false,"usgs":false,"family":"Benavides","given":"Jude","middleInitial":"A.","affiliations":[{"id":88132,"text":"University of Texas Rio Grande Valley, Brownsville, TX","active":true,"usgs":false}],"preferred":false,"id":961780,"contributorType":{"id":1,"text":"Authors"},"rank":12},{"text":"Lawson, Robert S.","contributorId":371401,"corporation":false,"usgs":false,"family":"Lawson","given":"Robert","middleInitial":"S.","affiliations":[{"id":88134,"text":"Cherokee Nation System Solutions, Contractor to U.S. Geological Survey","active":true,"usgs":false}],"preferred":false,"id":961781,"contributorType":{"id":1,"text":"Authors"},"rank":13},{"text":"Martinez, James","contributorId":371402,"corporation":false,"usgs":false,"family":"Martinez","given":"James","affiliations":[{"id":88132,"text":"University of Texas Rio Grande Valley, Brownsville, TX","active":true,"usgs":false}],"preferred":false,"id":961782,"contributorType":{"id":1,"text":"Authors"},"rank":14}]}} ,{"id":70275700,"text":"70275700 - 2026 - Walleye In our hands","interactions":[],"lastModifiedDate":"2026-05-13T13:49:23.310903","indexId":"70275700","displayToPublicDate":"2026-05-08T08:45:11","publicationYear":"2026","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":4,"text":"Other Government Series"},"title":"Walleye In our hands","docAbstract":"No abstract available.
","language":"English","publisher":"Keep Fish Wet, Inc.","usgsCitation":"Embke, H., 2026, Walleye In our hands, 1 p.","productDescription":"1 p.","ipdsId":"IP-188429","costCenters":[{"id":65882,"text":"Midwest Climate Adaptation Science Center","active":true,"usgs":true}],"links":[{"id":504295,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":504294,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://www.keepfishwet.org/walleye-in-our-hands"}],"noUsgsAuthors":false,"publicationDate":"2026-05-08","publicationStatus":"PW","contributors":{"authors":[{"text":"Embke, Holly Susan 0000-0002-9897-7068","orcid":"https://orcid.org/0000-0002-9897-7068","contributorId":358337,"corporation":false,"usgs":true,"family":"Embke","given":"Holly Susan","affiliations":[{"id":65882,"text":"Midwest Climate Adaptation Science Center","active":true,"usgs":true}],"preferred":true,"id":961441,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70276545,"text":"70276545 - 2026 - Bank-dwelling beavers contribute to the wood regime in a dryland river","interactions":[],"lastModifiedDate":"2026-06-09T15:42:34.972701","indexId":"70276545","displayToPublicDate":"2026-05-08T08:36:44","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1465,"text":"Ecology","active":true,"publicationSubtype":{"id":10}},"title":"Bank-dwelling beavers contribute to the wood regime in a dryland river","docAbstract":"Our findings suggest that the influence of dwelling beavers on large wood budgets may substantially determine the structure and function of medium to large rivers, particularly in dryland systems such as the White River. Recognizing the role of bank-dwelling beavers expands our understanding of biotic drivers of riverscape complexity and provides new opportunities to integrate ecology with fluvial geomorphology in managing and restoring dynamic river corridors.","language":"English","publisher":"Wiley","doi":"10.1002/ecy.70396","usgsCitation":"Pennock, C.A., Macfarlane, W.W., Budy, P., Scamardo, J., and White, D.C., 2026, Bank-dwelling beavers contribute to the wood regime in a dryland river: Ecology, v. 107, no. 5, e70396, 4 p., https://doi.org/10.1002/ecy.70396.","productDescription":"e70396, 4 p.","ipdsId":"IP-181956","costCenters":[{"id":200,"text":"Coop Res Unit Seattle","active":true,"usgs":true}],"links":[{"id":505475,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1002/ecy.70396","text":"Publisher Index Page"},{"id":505237,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Utah","otherGeospatial":"eastern Utah, White River","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -110.1937831,\n 40.5473335\n ],\n [\n -110.1937831,\n 40.5473335\n ],\n [\n -110.1937831,\n 40.5473335\n ],\n [\n -110.1937831,\n 40.5473335\n ]\n ]\n ]\n }\n },\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -110.01797237006852,\n 40.53009343582272\n ],\n [\n -109.18996035918502,\n 40.53009343582272\n ],\n [\n -109.18996035918502,\n 39.923899931201504\n ],\n [\n -110.01797237006852,\n 39.923899931201504\n ],\n [\n -110.01797237006852,\n 40.53009343582272\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"107","issue":"5","noUsgsAuthors":false,"publicationDate":"2026-05-08","publicationStatus":"PW","contributors":{"authors":[{"text":"Pennock, Casey A.","contributorId":371986,"corporation":false,"usgs":false,"family":"Pennock","given":"Casey","middleInitial":"A.","affiliations":[{"id":18155,"text":"The Ohio State University","active":true,"usgs":false}],"preferred":false,"id":962640,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Macfarlane, William W.","contributorId":371987,"corporation":false,"usgs":false,"family":"Macfarlane","given":"William","middleInitial":"W.","affiliations":[{"id":6682,"text":"Utah State University","active":true,"usgs":false}],"preferred":false,"id":962641,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Budy, Phaedra E. 0000-0002-9918-1678","orcid":"https://orcid.org/0000-0002-9918-1678","contributorId":228930,"corporation":false,"usgs":true,"family":"Budy","given":"Phaedra E.","affiliations":[{"id":200,"text":"Coop Res Unit Seattle","active":true,"usgs":true}],"preferred":true,"id":962642,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Scamardo, Julianne","contributorId":352464,"corporation":false,"usgs":false,"family":"Scamardo","given":"Julianne","affiliations":[{"id":37627,"text":"Department of Watershed Sciences, Utah State University, Logan, UT, USA","active":true,"usgs":false}],"preferred":false,"id":962643,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"White, Daniel C.","contributorId":371994,"corporation":false,"usgs":false,"family":"White","given":"Daniel","middleInitial":"C.","affiliations":[{"id":6621,"text":"Colorado State University","active":true,"usgs":false}],"preferred":false,"id":962644,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70276615,"text":"70276615 - 2026 - Genomic structural variation rescues a classic biological invader from a population bottleneck","interactions":[],"lastModifiedDate":"2026-06-11T13:28:07.413161","indexId":"70276615","displayToPublicDate":"2026-05-08T08:23:03","publicationYear":"2026","noYear":false,"publicationType":{"id":27,"text":"Preprint"},"publicationSubtype":{"id":32,"text":"Preprint"},"seriesTitle":{"id":19846,"text":"BioRxiv","active":true,"publicationSubtype":{"id":32}},"title":"Genomic structural variation rescues a classic biological invader from a population bottleneck","docAbstract":"Invasion genetics presents a classic paradox: how do species successfully spread despite severe population bottlenecks? The brown treesnake (Boiga irregularis) in Guam represents a striking example of this phenomenon, having been introduced with only a handful of individuals. We show that the population endured an extreme bottleneck, with roughly half of the genome exhibiting runs of homozygosity, comparable to species of conservation concern. Despite this, we uncovered extensive diversity in the form of nearly 19,000 genomic structural variants, which affect almost eight times more of the genome than single-nucleotide variants and provide material for ‘rescuing’ the population from inbreeding-driven declines. Structural variant density was highest in gene promoters, where recombination and DNA repair often occur, providing a mechanism for rapid evolution of gene-linked diversity. This diversity is enriched in genes vital for adaptive immunity and olfaction, suggesting genomic diversity in key chromosomal regions can rescue populations from inbreeding. This work has critical implications for invasion biology and conservation genetics practitioners.
","language":"English","publisher":"BioRxiv","doi":"10.64898/2026.01.30.702330","usgsCitation":"Osborne, C., Foote, B.M., Fleck, S.J., Waterman, H.M., Chang, S.I., Nafus, M.G., Bellinger, M.R., Gray, L., and Krabbenhoft, T.J., 2026, Genomic structural variation rescues a classic biological invader from a population bottleneck: BioRxiv, preprint posted May 08, 2026, https://doi.org/10.64898/2026.01.30.702330.","productDescription":"59 p.","ipdsId":"IP-185639","costCenters":[{"id":521,"text":"Pacific Island Ecosystems Research Center","active":false,"usgs":true}],"links":[{"id":505496,"rank":0,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://doi.org/10.64898/2026.01.30.702330","text":"External Repository"},{"id":505383,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationDate":"2026-05-08","publicationStatus":"PW","contributors":{"authors":[{"text":"Osborne, Christopher 0000-0001-6387-5451","orcid":"https://orcid.org/0000-0001-6387-5451","contributorId":316603,"corporation":false,"usgs":false,"family":"Osborne","given":"Christopher","email":"","affiliations":[{"id":68653,"text":"State Univeristy of New York College University of Buffalo","active":true,"usgs":false}],"preferred":false,"id":962839,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Foote, Brian M","contributorId":372157,"corporation":false,"usgs":false,"family":"Foote","given":"Brian","middleInitial":"M","affiliations":[{"id":12978,"text":"Department of Biological Sciences, University at Buffalo","active":true,"usgs":false}],"preferred":false,"id":962840,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Fleck, Steven J 0000-0001-5370-2258","orcid":"https://orcid.org/0000-0001-5370-2258","contributorId":372158,"corporation":false,"usgs":false,"family":"Fleck","given":"Steven","middleInitial":"J","affiliations":[{"id":12978,"text":"Department of Biological Sciences, University at Buffalo","active":true,"usgs":false}],"preferred":false,"id":962841,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Waterman, Hannah M 0000-0002-8991-1059","orcid":"https://orcid.org/0000-0002-8991-1059","contributorId":372159,"corporation":false,"usgs":false,"family":"Waterman","given":"Hannah","middleInitial":"M","affiliations":[{"id":12978,"text":"Department of Biological Sciences, University at Buffalo","active":true,"usgs":false}],"preferred":false,"id":962842,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Chang, Sarah I 0000-0001-7280-8664","orcid":"https://orcid.org/0000-0001-7280-8664","contributorId":372160,"corporation":false,"usgs":false,"family":"Chang","given":"Sarah","middleInitial":"I","affiliations":[{"id":12978,"text":"Department of Biological Sciences, University at Buffalo","active":true,"usgs":false}],"preferred":false,"id":962843,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Nafus, Melia G. 0000-0002-7325-3055 mnafus@usgs.gov","orcid":"https://orcid.org/0000-0002-7325-3055","contributorId":197462,"corporation":false,"usgs":true,"family":"Nafus","given":"Melia","email":"mnafus@usgs.gov","middleInitial":"G.","affiliations":[{"id":291,"text":"Fort Collins Science Center","active":true,"usgs":true}],"preferred":true,"id":962844,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Bellinger, Mona Renee 0000-0001-5274-9572","orcid":"https://orcid.org/0000-0001-5274-9572","contributorId":301018,"corporation":false,"usgs":true,"family":"Bellinger","given":"Mona","email":"","middleInitial":"Renee","affiliations":[{"id":521,"text":"Pacific Island Ecosystems Research Center","active":false,"usgs":true}],"preferred":true,"id":962845,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Gray, Levi N 0000-0002-4428-1057","orcid":"https://orcid.org/0000-0002-4428-1057","contributorId":356349,"corporation":false,"usgs":false,"family":"Gray","given":"Levi N","affiliations":[{"id":40126,"text":"University of Buffalo","active":true,"usgs":false}],"preferred":false,"id":962846,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Krabbenhoft, Trevor J 0000-0002-7680-5169","orcid":"https://orcid.org/0000-0002-7680-5169","contributorId":372161,"corporation":false,"usgs":false,"family":"Krabbenhoft","given":"Trevor","middleInitial":"J","affiliations":[{"id":12978,"text":"Department of Biological Sciences, University at Buffalo","active":true,"usgs":false}],"preferred":false,"id":962847,"contributorType":{"id":1,"text":"Authors"},"rank":9}]}} ,{"id":70275631,"text":"sir20265007 - 2026 - Regression models for estimating suspended sediment concentrations and loads and comparison with acoustic surrogate model on the Snake River, Weiser, Idaho, 1977–2022","interactions":[],"lastModifiedDate":"2026-05-11T17:06:06.542003","indexId":"sir20265007","displayToPublicDate":"2026-05-07T15:45:00","publicationYear":"2026","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":334,"text":"Scientific Investigations Report","code":"SIR","onlineIssn":"2328-0328","printIssn":"2328-031X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2026-5007","displayTitle":"Regression Models for Estimating Suspended Sediment Concentrations and Loads and Comparison With Acoustic Surrogate Model on the Snake River, Weiser, Idaho, 1977–2022","title":"Regression models for estimating suspended sediment concentrations and loads and comparison with acoustic surrogate model on the Snake River, Weiser, Idaho, 1977–2022","docAbstract":"The U.S. Geological Survey, in cooperation with Idaho Power, developed streamflow- based regression models to estimate suspended sediment concentration (SSC) and loads on the Snake River at Weiser, Idaho site (U.S. Geological Survey streamgage 13269000; hereafter referred to as “Snake at Weiser site”). This site sits upstream from the dams and reservoirs of the Hells Canyon Complex and the Hells Canyon National Recreation Area, where large sandbars along the Snake River that provide recreation and riparian habitat and host archaeological resources have declined since 1973. Analyses of samples from historical (1977- 2003) and modern (2017- 22) periods show that SSC has decreased over time, with median concentrations declining from 50 milligrams per liter (mg/L) to 28 mg/L. Mann- Kendall trend tests confirm statistically significant declines in total SSC and the fine and sand fractions of suspended sediment through the full period of record.
Regression models specific to each period outperformed models using the full dataset, suggesting changes in the sediment supply to this reach of the Snake River and highlighting the need for period- based approaches. Regression models for total SSC and fine sediment were more accurate than those for sand, which exhibited greater error and bias, likely reflecting a sand supply limited by upstream dams. The regression model for modern period total SSC and a previously developed acoustic surrogate model showed similar performance, indicating both methods are viable for estimating SSC and loads.
These findings help to better quantify suspended sediment concentrations and loads upstream of the Hells Canyon Complex and provide resource managers with tools to better quantify sediment loads affecting reservoir storage and the maintenance of sandbars in the Hells Canyon National Recreation Area.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/sir20265007","collaboration":"Prepared in cooperation with Idaho Power","usgsCitation":"Kenworthy, M.K., 2026, Regression models for estimating suspended sediment concentrations and loads and comparison with acoustic surrogate model on the Snake River, Weiser, Idaho, 1977–2022: U.S. Geological Survey Scientific Investigations Report 2026–5007, 27 p., https://doi.org/10.3133/sir20265007.","productDescription":"Report: vi, 27 p.; 2 Data Releases","numberOfPages":"27","onlineOnly":"Y","additionalOnlineFiles":"N","ipdsId":"IP-173970","costCenters":[{"id":343,"text":"Idaho Water Science Center","active":true,"usgs":true}],"links":[{"id":504272,"rank":8,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_119409.htm","linkFileType":{"id":5,"text":"html"}},{"id":504016,"rank":7,"type":{"id":30,"text":"Data Release"},"url":"https://doi.org/10.5066/P14KZNMK","text":"USGS data release","linkHelpText":"Suspended sediment dataset for development of regression models to estimate suspended sediment concentration and loads for the Snake River at Weiser, Idaho, 1977–2022"},{"id":504011,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/sir/2026/5007/sir20265007.pdf","size":"4.25 MB","description":"SIR 2026-5007 PDF"},{"id":504015,"rank":6,"type":{"id":30,"text":"Data Release"},"url":"https://doi.org/10.5066/P9YT1GIC","text":"USGS data release","linkHelpText":"Model Archive Summary for acoustic derived suspended- sediment concentration at 13269000 Snake River at Weiser, ID"},{"id":504014,"rank":5,"type":{"id":34,"text":"Image Folder"},"url":"https://pubs.usgs.gov/sir/2026/5007/images/"},{"id":504013,"rank":4,"type":{"id":31,"text":"Publication XML"},"url":"https://pubs.usgs.gov/sir/2026/5007/sir20265007.XML","description":"SIR 2026-5007 XML"},{"id":504012,"rank":3,"type":{"id":39,"text":"HTML Document"},"url":"https://pubs.usgs.gov/publication/sir20265007/full","description":"SIR 2026-5007 HTML"},{"id":504010,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/sir/2026/5007/coverthb.jpg"}],"country":"United States","state":"Idaho, Nevada, Oregon, Utah","otherGeospatial":"Snake River","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -119,\n 45.5\n ],\n [\n -113,\n 45.5\n ],\n [\n -113,\n 41\n ],\n [\n -119,\n 41\n ],\n [\n -119,\n 45.5\n ]\n ]\n ]\n }\n }\n ]\n}","contact":"Director, Idaho Water Science Center
U.S. Geological Survey
230 Collins Rd.
Boise, Idaho 83702-4520
In September 2021, National Park Service staff, U.S. Geological Survey scientists, and an international team of researchers revealed evidence in the form of human footprints at White Sands National Park, New Mexico, that showed people were present in North America between 23,000 and 21,000 years ago. This time was during the Last Glacial Maximum, when large ice sheets covered much of the continent. The results stunned the scientific community and sparked a global debate. The story of how the discoveries were made, how they upended traditional thought, and how they “rewrote the book” on the earliest phases of North American prehistory is a classic example of the process of science.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston VA","doi":"10.3133/fs20253046","collaboration":"Prepared in cooperation with National Park Service","usgsCitation":"Springer, K.B., Pigati, J.S., Bustos, D., Urban, T.M., and Bennett, M.R., 2026, Fossil footprints and Ice Age ecosystems of White Sands National Park: U.S. Geological Survey Fact Sheet 2025-3046, 4 p., https://doi.org/10.3133/fs20253046.","productDescription":"4 p.","onlineOnly":"N","ipdsId":"IP-177481","costCenters":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"links":[{"id":503941,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/fs/2025/3046/coverthb.jpg"},{"id":503942,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/fs/2025/3046/fs20253046.pdf","text":"Report","size":"1.60 MB","linkFileType":{"id":1,"text":"pdf"},"description":"FS 2025-3046"},{"id":504017,"rank":3,"type":{"id":34,"text":"Image Folder"},"url":"https://pubs.usgs.gov/fs/2025/3046/images"},{"id":504018,"rank":4,"type":{"id":31,"text":"Publication XML"},"url":"https://pubs.usgs.gov/fs/2025/3046/fs20253046.xml"},{"id":504111,"rank":5,"type":{"id":39,"text":"HTML Document"},"url":"https://pubs.usgs.gov/publication/fs20253046/full","text":"Report","linkFileType":{"id":5,"text":"html"},"description":"FS 2025-3046"}],"country":"United States","state":"New Mexico","otherGeospatial":"White Sands National Park","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -106.50247040524931,\n 32.88598162330949\n ],\n [\n -106.11338464579849,\n 32.88598162330949\n ],\n [\n -106.11338464579849,\n 32.64753255908184\n ],\n [\n -106.50247040524931,\n 32.64753255908184\n ],\n [\n -106.50247040524931,\n 32.88598162330949\n ]\n ]\n ]\n }\n }\n ]\n}","contact":"Director, Geosciences and Environmental Change Science Center
U.S. Geological Survey
Box 25046, MS-980
Denver, CO 80225
This fact sheet summarizes the discovery, documentation, and publication of scientific results related to ancient human footprints at White Sands National Park that showed humans were present in North America during the Last Glacial Maximum.
","publicationDate":"2026-05-07","publicationStatus":"PW","contributors":{"authors":[{"text":"Springer, Kathleen B. 0000-0002-2404-0264 kspringer@usgs.gov","orcid":"https://orcid.org/0000-0002-2404-0264","contributorId":149826,"corporation":false,"usgs":true,"family":"Springer","given":"Kathleen","email":"kspringer@usgs.gov","middleInitial":"B.","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":960967,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Pigati, Jeffrey S. 0000-0001-5843-6219 jpigati@usgs.gov","orcid":"https://orcid.org/0000-0001-5843-6219","contributorId":201167,"corporation":false,"usgs":true,"family":"Pigati","given":"Jeffrey","email":"jpigati@usgs.gov","middleInitial":"S.","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":960820,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Bustos, David","contributorId":265969,"corporation":false,"usgs":false,"family":"Bustos","given":"David","email":"","affiliations":[{"id":36189,"text":"National Park Service","active":true,"usgs":false}],"preferred":false,"id":960822,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Urban, Thomas M.","contributorId":370870,"corporation":false,"usgs":false,"family":"Urban","given":"Thomas","middleInitial":"M.","affiliations":[{"id":12722,"text":"Cornell University","active":true,"usgs":false}],"preferred":false,"id":960823,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Bennett, Matthew R.","contributorId":370871,"corporation":false,"usgs":false,"family":"Bennett","given":"Matthew","middleInitial":"R.","affiliations":[{"id":48716,"text":"Bournemouth University","active":true,"usgs":false}],"preferred":false,"id":960824,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70275237,"text":"sir20265135 - 2026 - Water use in Louisiana, 2020","interactions":[],"lastModifiedDate":"2026-06-16T20:10:53.677874","indexId":"sir20265135","displayToPublicDate":"2026-05-07T09:31:12","publicationYear":"2026","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":334,"text":"Scientific Investigations Report","code":"SIR","onlineIssn":"2328-0328","printIssn":"2328-031X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2026-5135","displayTitle":"Water Use in Louisiana, 2020","title":"Water use in Louisiana, 2020","docAbstract":"The U.S. Geological Survey (USGS), in cooperation with the Louisiana Department of Transportation and Development, collected water-withdrawal and water-use data from a 2020 inventory of water withdrawals in Louisiana. In 2020, approximately 8,700 million gallons per day (Mgal/d) of water was withdrawn from groundwater and surface-water sources in Louisiana, which represented a 0.22-percent decrease from 2015. Total groundwater withdrawals were about 1,900 Mgal/d, an increase of 7.1 percent from 2015, and total surface-water withdrawals were about 6,800 Mgal/d, a decrease of 2.1 percent from 2015 to 2020.
Total water withdrawals, in million gallons per day, in 2020 for the various categories of use were as follows: public supply, 720; industry, 2,100; power generation, 4,100; rural domestic, 39; livestock, 7.0; rice irrigation, 930; general irrigation, 250; and aquaculture, 590. From 2015 to 2020, Louisiana’s total withdrawals for public supply increased by 1.4 percent, industry decreased by 2.3 percent, power generation decreased by 4.9 percent, rural domestic decreased by 1.2 percent, livestock increased by 11 percent, rice irrigation increased by 13 percent, general irrigation increased by 12 percent, and aquaculture increased by 20 percent.
About 51 percent (approximately 960 Mgal/d) of all groundwater withdrawn was from the Chicot aquifer system and 24 percent (approximately 450 Mgal/d) was withdrawn from the Mississippi River alluvial aquifer. Since 2015, withdrawals from the Chicot aquifer system increased by 13 percent, and withdrawals from the Mississippi River alluvial aquifer increased by 18 percent. About 72 percent (4,900 Mgal/d) of all surface water withdrawn was from the Mississippi River main stem. This value represents a 1.1-percent decrease in withdrawals from 2015 to 2020.
All water-withdrawal and water-use data presented in this report should be considered estimates. Because of rounding, totals and percentages presented in the tables, figures, and text in the report may differ slightly from totals or percentages calculated individually.
Director, Lower Mississippi-Gulf Water Science Center
U.S. Geological Survey
640 Grassmere Park, Suite 100
Nashville, TN 37211
Contact Us- USGS Publications Warehouse
","tableOfContents":"Provenance analysis is a powerful tool for investigating sediment delivery networks, constraining magmatic histories, and reconstructing the tectonic evolution of orogenic belts and basins. Basin analysis studies increasingly use detrital zircon (DZ) U-Pb forward mixture modeling to enhance provenance interpretations by quantifying the relative contributions of different sources. Forward mixture modeling requires significant a priori knowledge that limits deep-time applications. This challenge is overcome with an inverse mixture modeling approach non-negative matrix factorization to reconstruct the number and age distributions of paleo-source regions of Proterozoic metasedimentary rocks in the southwestern United States. This analysis indicates eight reconstructed end-member distributions representing unique sediment sources: two multi-modal end members characterized by ages older than ca. 1.8 Ga from cratonic Laurentia, five unimodal age distributions between ca. 1.80 Ga and 1.65 Ga consistent with Paleoproterozoic arc magmatic sources, and a ca. 1.6−1.5 Ga end member likely derived from exotic cratons in supercontinent Nuna (Columbia). Sediments deposited between ca. 1.80 Ga and 1.73 Ga yield heterogeneous age distributions suggesting multiple arc-backarc systems and several phases of slab roll back, contraction, and accretionary orogenesis, including input from pre−1.8 Ga Laurentian cratons. Homogenization of DZ signatures during the Yavapai orogeny (ca. 1.72−1.68 Ga) reflect crustal assembly as well as the uplift of Paleoproterozoic arcs in the orogenic hinterland. Detrital zircon age distributions from strata deposited during the Mazatzal orogeny (ca. 1.65−1.60 Ga) suggest the Mazatzal Province is a continental arc constructed on older crust. Mesoproterozoic samples are consistent with multiple basins derived from local recycling and long-distance sediment transport. Collectively, these data record the tectonic transition from the episodic accretion of disparate crustal domains to an increasingly integrated continental margin. These results provide new insights into the Proterozoic tectonic and paleogeographic evolution of the southwestern United States at basin to orogen scales and highlight the power of inverse DZ modeling to extract geologically meaningful quantitative mixture models from sedimentary records alone, offering a powerful tool for deep-time tectonic and basin analysis.
","language":"English","publisher":"Geological Society of America","doi":"10.1130/B38713.1","usgsCitation":"Hillenbrand, I.W., and Thomson, K.D., 2026, Reconstructing ancient sedimentary source-to-sink systems – Examples from southern Laurentia’s Proterozoic accretionary orogens: GSA Bulletin, https://doi.org/10.1130/B38713.1.","ipdsId":"IP-180279","costCenters":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"links":[{"id":504696,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Arizona, California, Colorado, New Mexico, Nevada, Texas, Utah, Wyoming","otherGeospatial":"southwestern United States","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -115,\n 45\n ],\n [\n -100,\n 45\n ],\n [\n -100,\n 30\n ],\n [\n -115,\n 30\n ],\n [\n -115,\n 45\n ]\n ]\n ]\n }\n }\n ]\n}","edition":"Online First","noUsgsAuthors":false,"publicationDate":"2026-05-07","publicationStatus":"PW","contributors":{"authors":[{"text":"Hillenbrand, Ian William 0000-0003-2801-3674","orcid":"https://orcid.org/0000-0003-2801-3674","contributorId":299032,"corporation":false,"usgs":true,"family":"Hillenbrand","given":"Ian","email":"","middleInitial":"William","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":961944,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Thomson, Kelly David 0000-0003-3378-1432","orcid":"https://orcid.org/0000-0003-3378-1432","contributorId":301019,"corporation":false,"usgs":true,"family":"Thomson","given":"Kelly","email":"","middleInitial":"David","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":961945,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70275677,"text":"70275677 - 2026 - Riverine pesticide trends in the United States: Assessing a decade of national-scale monitoring","interactions":[],"lastModifiedDate":"2026-06-17T13:22:52.707148","indexId":"70275677","displayToPublicDate":"2026-05-07T09:13:35","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":24028,"text":"Environmental Science & Technology Water (ES&T Water)","active":true,"publicationSubtype":{"id":10}},"title":"Riverine pesticide trends in the United States: Assessing a decade of national-scale monitoring","docAbstract":"Pesticides in freshwater systems can compromise water availability by degrading water quality, with implications for human health and aquatic life. Despite recognition of the need for national-scale monitoring and analysis, few studies have documented long-term trends in surface water pesticide contamination across the US. This study addresses that need by analyzing temporal trends and acute and chronic benchmark exceedances for aquatic life and human health from 81 river sites sampled from 2013 to 2022 using an analytical method targeting 80 pesticides. The majority (79%) of single site and pesticide combinations had too few pesticide detections to estimate trends. When detections were more frequent, increasing trends in concentration were twice as common as decreasing trends. Increasing pesticide concentrations were common in primary drainages of the Mississippi River Basin. Aquatic life benchmarks were exceeded by 19 pesticides, and exceedances were geographically widespread, with both acute and chronic aquatic life benchmark exceedances at 62% of sites. The herbicides atrazine and metolachlor and the insecticide imidacloprid were identified as the greatest threats to surface water availability based on their trends and aquatic life benchmark exceedances. These findings demonstrate the need for continued monitoring and trend analysis, driver investigation, and management strategies to protect freshwater resources.
","language":"English","publisher":"American Chemical Society Publications","doi":"10.1021/acsestwater.5c01472","usgsCitation":"Shoda, M.E., Breitmeyer, S.E., Hinman, E., and Stackpoole, S.M., 2026, Riverine pesticide trends in the United States: Assessing a decade of national-scale monitoring: Environmental Science & Technology Water (ES&T Water), v. 6, no. 6, p. 3510-3521, https://doi.org/10.1021/acsestwater.5c01472.","productDescription":"12 p.; Data Release","startPage":"3510","endPage":"3521","ipdsId":"IP-180524","costCenters":[{"id":532,"text":"Pennsylvania Water Science Center","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true}],"links":[{"id":504742,"rank":3,"type":{"id":30,"text":"Data Release"},"url":"https://doi.org/10.5066/P13VFS7H","text":"USGS data release","linkHelpText":"A data pipeline for fetching, processing, and analyzing riverine surface water pesticide trends and benchmark comparisons across the United 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]\n}","volume":"6","issue":"6","noUsgsAuthors":false,"publicationDate":"2026-05-07","publicationStatus":"PW","contributors":{"authors":[{"text":"Shoda, Megan E. 0000-0002-5343-9717 meshoda@usgs.gov","orcid":"https://orcid.org/0000-0002-5343-9717","contributorId":4352,"corporation":false,"usgs":true,"family":"Shoda","given":"Megan","email":"meshoda@usgs.gov","middleInitial":"E.","affiliations":[{"id":466,"text":"New England Water Science Center","active":true,"usgs":true},{"id":35860,"text":"Ohio-Kentucky-Indiana Water Science Center","active":true,"usgs":true},{"id":346,"text":"Indiana Water Science Center","active":true,"usgs":true},{"id":451,"text":"National Water Quality Assessment Program","active":true,"usgs":true},{"id":27231,"text":"Indiana-Kentucky Water Science Center","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true}],"preferred":true,"id":961387,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Breitmeyer, Sara E. 0000-0003-0609-1559 sbreitmeyer@usgs.gov","orcid":"https://orcid.org/0000-0003-0609-1559","contributorId":172622,"corporation":false,"usgs":true,"family":"Breitmeyer","given":"Sara","email":"sbreitmeyer@usgs.gov","middleInitial":"E.","affiliations":[{"id":37464,"text":"WMA - Laboratory & Analytical Services Division","active":true,"usgs":true},{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"preferred":true,"id":961388,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hinman, Elise Danica 0000-0001-5396-1583","orcid":"https://orcid.org/0000-0001-5396-1583","contributorId":356291,"corporation":false,"usgs":true,"family":"Hinman","given":"Elise Danica","affiliations":[{"id":37316,"text":"WMA - Integrated Information Dissemination Division","active":true,"usgs":true}],"preferred":true,"id":961389,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Stackpoole, Sarah M. 0000-0002-5876-4922","orcid":"https://orcid.org/0000-0002-5876-4922","contributorId":211238,"corporation":false,"usgs":true,"family":"Stackpoole","given":"Sarah","email":"","middleInitial":"M.","affiliations":[{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true}],"preferred":true,"id":961390,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70276566,"text":"70276566 - 2026 - Cook Inlet beluga whale calling varies by group characteristics, behavior, and tidal state","interactions":[],"lastModifiedDate":"2026-06-09T16:11:53.828437","indexId":"70276566","displayToPublicDate":"2026-05-07T09:07:54","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":982,"text":"Behavioral Ecology and Sociobiology","active":true,"publicationSubtype":{"id":10}},"title":"Cook Inlet beluga whale calling varies by group characteristics, behavior, and tidal state","docAbstract":"Communication allows social species to exchange information among group members. In aquatic environments, acoustic signals are among the most effective forms of communication and are important for many species, including cetaceans. Beluga whales (Delphinapterus leucas) are highly social and vocal, yet little is known about the functionality of their social calls. To examine context-dependent vocal behavior in belugas, we collected passive acoustic data and fine-scale behavioral observations for the endangered Cook Inlet beluga population. The resulting dataset includes 1,720 annotated vocalizations collected over 21 behaviorally encoded encounters. We fit generalized linear mixed models to these data to investigate the effect of behavioral state, group size, calf presence, and tidal state on (1) calling rate (number of calls/minute) and (2) call category (whistles, pulsed calls, combined calls). Belugas were more likely to call when traveling and had higher calling rates during flood tides. Group-level calling rate increased sublinearly with group size, suggesting that individuals called less in larger groups, possibly reflecting increased listening, vocal coordination, or a strategy to avoid acoustic masking. Group calling rate increased before transitions between traveling and milling, suggesting a possible link between communication and behavioral transitions. Whistles were more prevalent when traveling, while pulsed calls were more prevalent when milling. Combined calls occurred only when calves were present, indicating the importance of these calls in communication with calves. Identifying these communication patterns and the contexts in which they occur can enhance our understanding of beluga whale ecology and aid in conservation efforts via passive acoustic monitoring.
","language":"English","publisher":"Springer Nature","doi":"10.1007/s00265-026-03740-6","usgsCitation":"Brewer, A.M., Van Cise, A.M., Garner, C., Gilstad, A., Castellote, M., Converse, S.J., Goetz, K.T., and Berdahl, A.M., 2026, Cook Inlet beluga whale calling varies by group characteristics, behavior, and tidal state: Behavioral Ecology and Sociobiology, v. 80, 6, 16 p., https://doi.org/10.1007/s00265-026-03740-6.","productDescription":"6, 16 p.","ipdsId":"IP-183531","costCenters":[{"id":200,"text":"Coop Res Unit Seattle","active":true,"usgs":true}],"links":[{"id":505479,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1007/s00265-026-03740-6","text":"Publisher Index Page"},{"id":505241,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alaska","otherGeospatial":"Cook Inlet","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -154.85136047092215,\n 60.62831549811719\n ],\n [\n -151.01096777239783,\n 61.17874668796196\n ],\n [\n -149.92378999790864,\n 59.01208002904241\n ],\n [\n -153.53924170212275,\n 58.485308776435176\n ],\n [\n -154.85136047092215,\n 60.62831549811719\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"80","noUsgsAuthors":false,"publicationDate":"2026-05-07","publicationStatus":"PW","contributors":{"authors":[{"text":"Brewer, Arial M.","contributorId":372047,"corporation":false,"usgs":false,"family":"Brewer","given":"Arial","middleInitial":"M.","affiliations":[{"id":6934,"text":"University of Washington","active":true,"usgs":false}],"preferred":false,"id":962680,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Van Cise, Amy M.","contributorId":372048,"corporation":false,"usgs":false,"family":"Van Cise","given":"Amy","middleInitial":"M.","affiliations":[{"id":6934,"text":"University of Washington","active":true,"usgs":false}],"preferred":false,"id":962681,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Garner, Christopher","contributorId":372049,"corporation":false,"usgs":false,"family":"Garner","given":"Christopher","affiliations":[{"id":88244,"text":"US Air Force Conservation Department","active":true,"usgs":false}],"preferred":false,"id":962682,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Gilstad, Andrea","contributorId":372050,"corporation":false,"usgs":false,"family":"Gilstad","given":"Andrea","affiliations":[{"id":88244,"text":"US Air Force Conservation Department","active":true,"usgs":false}],"preferred":false,"id":962683,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Castellote, Manuel","contributorId":200241,"corporation":false,"usgs":false,"family":"Castellote","given":"Manuel","email":"","affiliations":[],"preferred":false,"id":962684,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Converse, Sarah J. 0000-0002-3719-5441 sconverse@usgs.gov","orcid":"https://orcid.org/0000-0002-3719-5441","contributorId":173772,"corporation":false,"usgs":true,"family":"Converse","given":"Sarah","email":"sconverse@usgs.gov","middleInitial":"J.","affiliations":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true},{"id":200,"text":"Coop Res Unit Seattle","active":true,"usgs":true}],"preferred":true,"id":962685,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Goetz, Kimberly T.","contributorId":372053,"corporation":false,"usgs":false,"family":"Goetz","given":"Kimberly","middleInitial":"T.","affiliations":[{"id":36612,"text":"National Marine Fisheries Service","active":true,"usgs":false}],"preferred":false,"id":962686,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Berdahl, Andrew M.","contributorId":372054,"corporation":false,"usgs":false,"family":"Berdahl","given":"Andrew","middleInitial":"M.","affiliations":[{"id":6934,"text":"University of Washington","active":true,"usgs":false}],"preferred":false,"id":962687,"contributorType":{"id":1,"text":"Authors"},"rank":8}]}} ,{"id":70276283,"text":"70276283 - 2026 - Acoustic measurements and modeling of sub-bottom layers on the summit of the Atlantis II Seamount","interactions":[],"lastModifiedDate":"2026-05-26T14:09:39.225853","indexId":"70276283","displayToPublicDate":"2026-05-07T09:05:37","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":24795,"text":"JASA Express Letters","active":true,"publicationSubtype":{"id":10}},"title":"Acoustic measurements and modeling of sub-bottom layers on the summit of the Atlantis II Seamount","docAbstract":"Sub-bottom profiler images taken from the summit plateau of the Atlantis II Seamount reveal distinct seabed stratigraphy, including marine sediment, limestone, and basalt layers. Acoustic reflection data also show arrivals reflecting from this sub-bottom structure. A wavenumber integration model with elastic geoacoustic properties is able to reproduce the arrival pattern of seabed reflections and particularly the phase inversion of the sub-bottom return. The reflection model suggests that the limestone layer is eroded with high porosity and possesses a lower compressional velocity than a well-cemented layer. The model results also highlight the necessity of incorporating elastic effects for realistic geoacoustic characterization.
","language":"English","publisher":"Acoustical Society of America","doi":"10.1121/10.0043836","usgsCitation":"Chen, T., Milone, M.A., Chaytor, J., Miller, J.H., Potty, G.R., Hodgkiss, W.S., and Lin, Y., 2026, Acoustic measurements and modeling of sub-bottom layers on the summit of the Atlantis II Seamount: JASA Express Letters, v. 6, no. 5, 0056001, 8 p., https://doi.org/10.1121/10.0043836.","productDescription":"0056001, 8 p.","ipdsId":"IP-185781","costCenters":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":504807,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1121/10.0043836","text":"Publisher Index Page"},{"id":504692,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"otherGeospatial":"Atlantis II Seamount","volume":"6","issue":"5","noUsgsAuthors":false,"publicationDate":"2026-05-07","publicationStatus":"PW","contributors":{"authors":[{"text":"Chen, Tzu-Ting","contributorId":371528,"corporation":false,"usgs":false,"family":"Chen","given":"Tzu-Ting","affiliations":[{"id":88174,"text":"Institute of Oceanography, National Taiwan University, Taipei","active":true,"usgs":false}],"preferred":false,"id":961955,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Milone, Matthew A.","contributorId":371529,"corporation":false,"usgs":false,"family":"Milone","given":"Matthew","middleInitial":"A.","affiliations":[{"id":35051,"text":"Scripps Institution of Oceanography, UC San Diego","active":true,"usgs":false}],"preferred":false,"id":961956,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Chaytor, Jason 0000-0001-8135-8677 jchaytor@usgs.gov","orcid":"https://orcid.org/0000-0001-8135-8677","contributorId":140095,"corporation":false,"usgs":true,"family":"Chaytor","given":"Jason","email":"jchaytor@usgs.gov","affiliations":[{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true},{"id":186,"text":"Coastal and Marine Geology Program","active":true,"usgs":true},{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":961957,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Miller, James H.","contributorId":371530,"corporation":false,"usgs":false,"family":"Miller","given":"James","middleInitial":"H.","affiliations":[{"id":88175,"text":"Department of Ocean Engineering, University of Rhode Island","active":true,"usgs":false}],"preferred":false,"id":961958,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Potty, Gopu R.","contributorId":371531,"corporation":false,"usgs":false,"family":"Potty","given":"Gopu","middleInitial":"R.","affiliations":[{"id":88175,"text":"Department of Ocean Engineering, University of Rhode Island","active":true,"usgs":false}],"preferred":false,"id":961959,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Hodgkiss, William S..","contributorId":317854,"corporation":false,"usgs":false,"family":"Hodgkiss","given":"William","email":"","middleInitial":"S..","affiliations":[{"id":34004,"text":"Scripps Institute of Oceanography","active":true,"usgs":false}],"preferred":false,"id":961960,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Lin, Ying-Tsong","contributorId":302804,"corporation":false,"usgs":false,"family":"Lin","given":"Ying-Tsong","email":"","affiliations":[],"preferred":false,"id":961961,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":70275706,"text":"70275706 - 2026 - Life history traits and population dynamics of Freshwater Drum across large river gradients","interactions":[],"lastModifiedDate":"2026-05-13T14:10:53.539574","indexId":"70275706","displayToPublicDate":"2026-05-07T09:05:02","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3624,"text":"Transactions of the American Fisheries Society","active":true,"publicationSubtype":{"id":10}},"title":"Life history traits and population dynamics of Freshwater Drum across large river gradients","docAbstract":"Monitoring and assessment of nongame native fishes is limited, but conservation interest in these species is growing. Freshwater Drum Aplodinotus grunniens are a wide-ranging species that serve important functional roles and could serve as an indicator for similar but less common species. Our overall objectives were to quantify and compare population dynamic rates and life history of Freshwater Drum among study reaches in the upper Mississippi and Illinois rivers and relate these metrics to hypothesized environmental and anthropogenic factors.
We integrated recently collected age data with monitoring data to estimate age and size distributions, growth curves, maturation schedules, mortality rates, and young-to-adult ratios of Freshwater Drum in six study reaches spanning 1,500 km of river. Principal component analyses and linear regression were used to relate environmental and anthropogenic gradients (latitude, commercial harvest, hydrologic dynamics, primary productivity) to life history traits and population dynamic rates.
We found latitudinal gradients in life history traits and population dynamic rates whereby Freshwater Drum in upstream, higher-latitude study reaches generally exhibited later maturity, slower growth, smaller maximum size, and lower mortality rates compared with those in lower-latitude study reaches. Further, young-to-adult ratios positively corresponded with chlorophyll-a concentration. No clear relationships were apparent between population dynamic rates and hydrologic variation or commercial harvest.
Latitude is an important structuring component of life history traits and population dynamics of Freshwater Drum in the upper Mississippi and Illinois rivers likely due to both temperature seasonality and disturbance regimes. The presence of demographic structure in a widespread, common species such as Freshwater Drum suggests similar patterns likely exist in other long-lived native fishes.
The giant gartersnake (Thamnophis gigas) is a semi aquatic snake endemic to the Central Valley of California. After losing 95 percent of its historic wetland habitat (Frayer and others, 1989), giant gartersnakes became state and federally listed as a threatened species (California Fish and Game Commission, 1971; U.S. Fish and Wildlife Service 1993, 1999). Continued monitoring of current populations and implementation of suggested management actions is necessary to recover the species. The Natomas basin in Sacramento, California, supports a population of giant gartersnakes persisting in restored marshes and rice agriculture. This annual report summarizes the giant gartersnake monitoring project for 2024, focusing on the apparent survival, abundance, density, and distribution of the giant gartersnakes and the connectivity of habitat throughout the Natomas basin. In 2024, 131 giant gartersnakes were captured 216 times at 44 sites by hand or trap. The catch-per-unit effort decreased from 2023 to 2024 but was similar to other years of the study. Estimates of occupancy increased between 2023 and 2024, although the trend of occupancy from 2011 through 2024 is still decreasing overall at a mean annual rate of 3 percent per year. Apparent survival was much higher at Betts-Kismat-Silva from 2018 to 2019 and from 2021 to 2022 than in other years, but this may be partly attributed to different sampling efforts over the years. Trapping effort was more consistent in the Sills tract, and apparent survival was slightly higher in later years (2022–23 and 2023–24). Giant gartersnake populations appeared to remain stable in 2024, but abundance, density, survival, and distribution is highly variable across different sites and years of the study. Continued monitoring of the populations would allow for better trend estimates over time and assessment of the effects of management activities. Giant gartersnake populations throughout the basin and on reserve lands would likely benefit from the following: (1) creating more managed marsh; (2) increasing the amount of emergent tule vegetation in existing marshes (for example, Cummings, Natomas Farms, and Lucich South); (3) continuing to flood existing marshes in early spring; (4) maintaining rice agriculture; and (5) continuing research into conservation actions that target the giant gartersnake, such as habitat and water management and translocation.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr20261009","collaboration":"Prepared in cooperation with the Natomas Basin Conservancy","programNote":"Ecosystems Mission Area—Species Management Research Program","usgsCitation":"Nguyen, A.M., Rose, J.P., Jordan, A.C., Napolitano, G.R., Macias, D., Schoenig, E.J., Reyes, G.A., and Halstead, B.J., 2026, Natomas basin giant gartersnake annual monitoring report 2024: U.S. Geological Survey Open-File Report 2026–1009, 40 p., https://doi.org/10.3133/ofr20261009.","productDescription":"viii, 40 p.","numberOfPages":"40","onlineOnly":"Y","additionalOnlineFiles":"N","ipdsId":"IP-181032","costCenters":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"links":[{"id":504021,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/2026/1009/ofr20261009.pdf","text":"Report","size":"6.7 MB","linkFileType":{"id":1,"text":"pdf"},"description":"OFR 2026-1009 PDF"},{"id":504023,"rank":4,"type":{"id":31,"text":"Publication XML"},"url":"https://pubs.usgs.gov/of/2026/1009/ofr20261009.XML","linkFileType":{"id":8,"text":"xml"},"description":"OFR 2026-1009 XML"},{"id":504020,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/2026/1009/coverthb2.jpg"},{"id":504022,"rank":3,"type":{"id":39,"text":"HTML Document"},"url":"https://pubs.usgs.gov/publication/ofr20261009/full","linkFileType":{"id":5,"text":"html"},"description":"OFR 2026-1009 HTML"},{"id":504024,"rank":5,"type":{"id":34,"text":"Image Folder"},"url":"https://pubs.usgs.gov/of/2026/1009/images"}],"country":"United States","state":"California","otherGeospatial":"Natomas Basin","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -121.633,\n 38.833\n ],\n [\n -121.433333,\n 38.833\n ],\n [\n -121.433333,\n 38.681881516888694\n ],\n [\n -121.633,\n 38.681881516888694\n ],\n [\n -121.633,\n 38.833\n ]\n ]\n ]\n }\n }\n ]\n}","contact":"Western Ecological Research Center
U.S. Geological Survey
3020 State University Drive East
Sacramento, California 95819
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 3 million barrels of oil and 343.5 trillion cubic feet of gas in reservoirs of the Bossier Formation within the onshore United States and State waters of the Gulf Coast region.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston VA","doi":"10.3133/fs20263004","programNote":"National and Global Petroleum Assessment","usgsCitation":"Gardner, R., Birdwell, J.E., Flaum, J.A., Kinney, S.A., Pitman, J.K., Paxton, S.T., Cicero, A.D., Lagesse, J.H., Pepin, J.D., Counts, J.W., Johnson, B.G., Lohr, C.D., Whidden, K.J., French, K.L., Mercier, T.J., and Leathers-Miller, H.M., 2026, Assessment of undiscovered oil and gas resources in the Bossier Formation within the onshore United States and State waters of the Gulf Coast region, 2025: U.S. Geological Survey Fact Sheet 2026–3004, 4 p., https://doi.org.10.3133/fs20263004.","productDescription":"Report: 4 p.; Data Release","onlineOnly":"Y","ipdsId":"IP-184698","costCenters":[{"id":164,"text":"Central Energy Resources Science Center","active":true,"usgs":true}],"links":[{"id":504226,"rank":6,"type":{"id":39,"text":"HTML Document"},"url":"https://pubs.usgs.gov/publication/fs20263004/full","text":"Report","linkFileType":{"id":5,"text":"html"},"description":"FS 2026-3004"},{"id":504040,"rank":5,"type":{"id":31,"text":"Publication XML"},"url":"https://pubs.usgs.gov/fs/2026/3004/fs20263004.xml"},{"id":504039,"rank":4,"type":{"id":34,"text":"Image Folder"},"url":"https://pubs.usgs.gov/fs/2026/3004/images"},{"id":504270,"rank":7,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_119407.htm","linkFileType":{"id":5,"text":"html"}},{"id":503891,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/fs/2026/3004/coverthb.jpg"},{"id":503892,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/fs/2026/3004/fs20263004.pdf","text":"Report","size":"3.83 MB","linkFileType":{"id":1,"text":"pdf"},"description":"FS 2026-3004"},{"id":503893,"rank":3,"type":{"id":30,"text":"Data Release"},"url":"https://doi.org/10.5066/P14PGG8R","text":"USGS data release","linkHelpText":"USGS National and Global Oil and Gas Assessment Project—Bossier Formation, Gulf Coast Region—Assessment Unit Boundaries, Assessment Input Data, and Fact Sheet Data Tables"}],"country":"United States","state":"Alabama, Arkansas, Florida, Louisiana, Mississippi, Texas","otherGeospatial":"Bossier Formation, Gulf Coast region","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -102,\n 34\n ],\n [\n -84,\n 34\n ],\n [\n -84,\n 27\n ],\n [\n -102,\n 27\n ],\n [\n -102,\n 34\n ]\n ]\n ]\n }\n }\n ]\n}","contact":"Director, Central Energy Resources Science Center
U.S. Geological Survey
Box 25046, MS-939
Denver, CO 80225-0046
Recreational fisheries are important global contributors to food security, socio-cultural practices, and local and regional economies. However, inland recreational fisheries are often overlooked by policymakers due to a limited understanding of the magnitude of participation, harvest, and economic impact. Here, we used the U.S. Inland Creel and Angler Survey Catalog and catch and effort model (CreelCatch) and several assumptions to provide an initial estimate of the magnitude of total inland recreational fisheries harvest in the conterminous USA. The CreelCatch model projected fishing harvest across lakes, ponds, and reservoirs based on fishing effort, water body area, and regional effects. We estimated that recreational lake fisheries in the conterminous USA likely harvest 236,000–671,000 tonnes of fish per year, 17–48 times greater than total inland fisheries harvest reported to the United Nations. Inland recreational fisheries may warrant greater consideration for their contribution to national scale socioeconomics and impacts on fish stocks and ecosystems.
","language":"English","publisher":"Oxford University Press","doi":"10.1093/fshmag/vuag014","usgsCitation":"Robertson, M.D., Embke, H., Lynch, A., Midway, S.R., and Paukert, C., 2026, Inland recreational fisheries harvest far exceeds reported inland harvest in the United States: Fisheries, https://doi.org/10.1093/fshmag/vuag014.","ipdsId":"IP-178993","costCenters":[{"id":198,"text":"Coop Res Unit Atlanta","active":true,"usgs":true},{"id":36940,"text":"National Climate Adaptation Science Center","active":true,"usgs":true},{"id":65882,"text":"Midwest Climate Adaptation Science Center","active":true,"usgs":true}],"links":[{"id":504218,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1093/fshmag/vuag014","text":"Publisher Index Page"},{"id":504092,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"conterminous United States","geographicExtents":"{\n 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Newfoundland","active":true,"usgs":false}],"preferred":false,"id":961327,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Embke, Holly Susan 0000-0002-9897-7068","orcid":"https://orcid.org/0000-0002-9897-7068","contributorId":358337,"corporation":false,"usgs":true,"family":"Embke","given":"Holly Susan","affiliations":[{"id":65882,"text":"Midwest Climate Adaptation Science Center","active":true,"usgs":true}],"preferred":true,"id":961328,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Lynch, Abigail J. 0000-0001-8449-8392","orcid":"https://orcid.org/0000-0001-8449-8392","contributorId":220490,"corporation":false,"usgs":true,"family":"Lynch","given":"Abigail","middleInitial":"J.","affiliations":[{"id":411,"text":"National Climate Change and Wildlife Science Center","active":true,"usgs":true}],"preferred":true,"id":961329,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Midway, Stephen R.","contributorId":371231,"corporation":false,"usgs":false,"family":"Midway","given":"Stephen","middleInitial":"R.","affiliations":[{"id":5115,"text":"Louisiana State University","active":true,"usgs":false}],"preferred":false,"id":961330,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Paukert, Craig 0000-0002-9369-8545","orcid":"https://orcid.org/0000-0002-9369-8545","contributorId":268045,"corporation":false,"usgs":true,"family":"Paukert","given":"Craig","affiliations":[{"id":198,"text":"Coop Res Unit Atlanta","active":true,"usgs":true}],"preferred":true,"id":961331,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70276523,"text":"70276523 - 2026 - Leopard occupancy and habitat use in the multi-use Chitwan-Annapurna Landscape, Nepal","interactions":[],"lastModifiedDate":"2026-06-09T16:58:23.2741","indexId":"70276523","displayToPublicDate":"2026-05-06T09:53:39","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3871,"text":"Global Ecology and Conservation","active":true,"publicationSubtype":{"id":10}},"title":"Leopard occupancy and habitat use in the multi-use Chitwan-Annapurna Landscape, Nepal","docAbstract":"We estimated leopard (Panthera pardus fusca) occupancy in a multi-use region within Nepal’s Chitwan-Annapurna Landscape to evaluate leopard habitat use and inform conservation planning in areas where most of the species’ habitat occurs outside protected areas. In 2021, sign surveys were conducted along 1277 km of transects distributed among 145 grid cells of 7×7 km within a 7105 km² study area, where 226 leopard signs (pugmarks and scats) were documented. We used an occupancy modeling framework to evaluate the influence of environmental and anthropogenic factors on leopard habitat use. We found that leopard occupancy (ψ = 0.73 ± 0.17 CI) was strongly and positively associated with areas used by wild prey such as red muntjac (Muntiacus muntjak), rhesus macaques (Macaca mulatta), chital (Axis axis), and wild boars (Sus scrofa). Our results provide evidence that large carnivores like leopards can persist in human-dominated landscapes when native prey remains abundant, underscoring the need for community-based conservation that sustains both prey and predator populations beyond protected areas. By estimating leopard occupancy outside of protected areas, the research establishes a baseline for developing management strategies to ensure the continued existence of leopards in Nepal's multi-use landscapes.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.gecco.2026.e04240","usgsCitation":"Poudel, S., Twining, J.P., Gilbert, M., Stedman, R.C., and Fuller, A.K., 2026, Leopard occupancy and habitat use in the multi-use Chitwan-Annapurna Landscape, Nepal: Global Ecology and Conservation, v. 68, e04240, 13 p., https://doi.org/10.1016/j.gecco.2026.e04240.","productDescription":"e04240, 13 p.","ipdsId":"IP-171391","costCenters":[{"id":199,"text":"Coop Res Unit Leetown","active":true,"usgs":true}],"links":[{"id":505485,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1016/j.gecco.2026.e04240","text":"Publisher Index Page"},{"id":505249,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Nepal","otherGeospatial":"Chitwan-Annapurna Landscape","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n 80.5864882,\n 30.6490225\n ],\n [\n 80.5864882,\n 30.6490225\n ],\n [\n 80.5864882,\n 30.6490225\n ],\n [\n 80.5864882,\n 30.6490225\n ]\n ]\n ]\n }\n },\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n 81.02866442667329,\n 30.56489592755348\n ],\n [\n 87.9944056,\n 27.8945674\n ],\n [\n 88.0807955,\n 26.2641858\n ],\n [\n 83.212831,\n 27.4466117\n ],\n [\n 79.5715026,\n 28.8561584\n ],\n [\n 81.02866442667329,\n 30.56489592755348\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"68","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Poudel, Shashank","contributorId":348087,"corporation":false,"usgs":false,"family":"Poudel","given":"Shashank","affiliations":[{"id":12722,"text":"Cornell University","active":true,"usgs":false}],"preferred":false,"id":962578,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Twining, Joshua P","contributorId":371922,"corporation":false,"usgs":false,"family":"Twining","given":"Joshua","middleInitial":"P","affiliations":[{"id":88237,"text":"Department of Fisheries, Wildlife, and Conservation Sciences, Oregon State University, Nash Hall, Corvallis, OR, USA, 97331","active":true,"usgs":false}],"preferred":false,"id":962579,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Gilbert, Martin","contributorId":225478,"corporation":false,"usgs":false,"family":"Gilbert","given":"Martin","affiliations":[{"id":41138,"text":"College of Veterinary Medicine, Cornel University, Ithaca, NY, USA","active":true,"usgs":false}],"preferred":false,"id":962580,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Stedman, Richard C","contributorId":371923,"corporation":false,"usgs":false,"family":"Stedman","given":"Richard","middleInitial":"C","affiliations":[{"id":88238,"text":"Ashley School of Global Development and the Environment, Cornell University, Fernow Hall, Ithaca, NY, USA, 14850","active":true,"usgs":false}],"preferred":false,"id":962581,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Fuller, Angela K. 0000-0002-9247-7468 afuller@usgs.gov","orcid":"https://orcid.org/0000-0002-9247-7468","contributorId":3984,"corporation":false,"usgs":true,"family":"Fuller","given":"Angela","email":"afuller@usgs.gov","middleInitial":"K.","affiliations":[{"id":199,"text":"Coop Res Unit Leetown","active":true,"usgs":true}],"preferred":true,"id":962582,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70276826,"text":"70276826 - 2026 - Patterns and drivers of cliff erosion in Big Sur, California, USA using repeat photogrammetry, 2017–2023","interactions":[],"lastModifiedDate":"2026-06-24T14:59:50.130518","indexId":"70276826","displayToPublicDate":"2026-05-06T09:47:19","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":5026,"text":"Earth and Space Science","active":true,"publicationSubtype":{"id":10}},"title":"Patterns and drivers of cliff erosion in Big Sur, California, USA using repeat photogrammetry, 2017–2023","docAbstract":"Seacliff erosion in steep terrain poses major risks to transportation and critical infrastructure. In Big Sur, California, USA, seacliff erosion threatens the sustainability of the central coast stretch of California State Route 1, a transportation corridor that is critical to the region's economy. Published cliff retreat rates for the region range from 1 to 40 cm yr−1, highlighting that high-resolution, process-based studies could enhance understanding of the causes of spatial and temporal variability. We quantified cliff erosion and investigated its drivers along ∼13 km of the Big Sur coastline at week–month timescales during the late fall to early spring wet seasons between January 2017 and June 2023 by analyzing 3D point clouds developed from aerial imagery using four-dimensional structure-from-motion (4D SfM) photogrammetry techniques. We calculated cliff face retreat rates of 2.23 ± 3.06 cm yr−1 (mean ±1σ), an order of magnitude lower than long-term estimated rates for the region (which included large deep-seated landslides), but in line with short-term rates reported across California. Change detection imagery comparison, cliff profiles through time, and statistical analysis reveal a cyclical cliff evolution process in which erosion by wave action at the cliff base destabilizes the cliff and primes it for subsequent failure during precipitation events. Although more erosion by volume could be attributed to precipitation-induced increases in soil moisture (784 m3 km−1 yr−1) compared with erosion attributed to wave power (282 m3 km−1 yr−1), our observations underscore the coupled nature of these processes in driving cliff evolution, consistent with established theory and observations.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2025EA004595","usgsCitation":"Dow, H.W., Warrick, J.A., and Ritchie, A., 2026, Patterns and drivers of cliff erosion in Big Sur, California, USA using repeat photogrammetry, 2017–2023: Earth and Space Science, v. 13, no. 5, e2025EA004595, 25 p., https://doi.org/10.1029/2025EA004595.","productDescription":"e2025EA004595, 25 p.","ipdsId":"IP-179578","costCenters":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":505818,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","city":"Big Sur","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -122,\n 37\n ],\n [\n -121.25,\n 37\n ],\n [\n -121.25,\n 35.75\n ],\n [\n -122,\n 35.75\n ],\n [\n -122,\n 37\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"13","issue":"5","noUsgsAuthors":false,"publicationDate":"2026-05-06","publicationStatus":"PW","contributors":{"authors":[{"text":"Dow, Helen Willemien 0000-0001-6386-5560","orcid":"https://orcid.org/0000-0001-6386-5560","contributorId":299290,"corporation":false,"usgs":true,"family":"Dow","given":"Helen","email":"","middleInitial":"Willemien","affiliations":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":963462,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Warrick, Jonathan A. 0000-0002-0205-3814 jwarrick@usgs.gov","orcid":"https://orcid.org/0000-0002-0205-3814","contributorId":167736,"corporation":false,"usgs":true,"family":"Warrick","given":"Jonathan","email":"jwarrick@usgs.gov","middleInitial":"A.","affiliations":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":963463,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Ritchie, Andrew C. 0000-0001-5826-9983","orcid":"https://orcid.org/0000-0001-5826-9983","contributorId":333630,"corporation":false,"usgs":true,"family":"Ritchie","given":"Andrew C.","affiliations":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":963464,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70275657,"text":"70275657 - 2026 - Drift and dispersion of silver carp (Hypophthalmichthys molitrix) eggs and larvae for hypothetical spawning scenarios in the Upper Mississippi River","interactions":[],"lastModifiedDate":"2026-05-07T14:43:22.789474","indexId":"70275657","displayToPublicDate":"2026-05-06T09:33:25","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3358,"text":"Scientific Reports","active":true,"publicationSubtype":{"id":10}},"displayTitle":"Drift and dispersion of silver carp (Hypophthalmichthys molitrix) eggs and larvae for hypothetical spawning scenarios in the Upper Mississippi River","title":"Drift and dispersion of silver carp (Hypophthalmichthys molitrix) eggs and larvae for hypothetical spawning scenarios in the Upper Mississippi River","docAbstract":"Invasive carp pose ecological and economic risks to North American freshwater systems. This study uses the Fluvial Egg Drift Simulator to model the drift of invasive silver carp (Hypophthalmichthys molitrix) eggs and larvae after hypothetical spawning in Pools 1–10 of the Upper Mississippi River. Although adult invasive carps have been detected in this region, no reproduction has been confirmed as of this publication. A total of 450 spawning scenarios were simulated, representing 5 water temperatures, 9 flows, and 10 spawning locations in the tailwaters of lock and dam structures. The study examined egg and larval positions at two key developmental stages: hatching and gas bladder inflation, when larvae seek nursery habitat. Under a wide variety of flow conditions and water temperatures, eggs spawned upstream from Lake Pepin (Pool 4) are likely to settle in the lake before hatching, possibly increasing mortality rates. Eggs that survive passage through Lake Pepin reach gas bladder inflation within the study area, except in scenarios with lower temperatures and higher flows. Conversely, larvae spawned downstream from Lake Pepin generally drift out of the study area before reaching gas bladder inflation, except in cases of higher temperatures and lower flows. These findings inform ichthyoplankton sampling strategies and management actions aimed at reducing invasive carp populations in areas likely to support recruitment.
","language":"English","publisher":"Nature","doi":"10.1038/s41598-026-41803-w","usgsCitation":"LeRoy, J.Z., Loppnow, G., Jackson, P.R., and Lasher, G.E., 2026, Drift and dispersion of silver carp (Hypophthalmichthys molitrix) eggs and larvae for hypothetical spawning scenarios in the Upper Mississippi River: Scientific Reports, v. 16, 14421, 18 p., https://doi.org/10.1038/s41598-026-41803-w.","productDescription":"14421, 18 p.","ipdsId":"IP-173009","costCenters":[{"id":36532,"text":"Central Midwest Water Science Center","active":true,"usgs":true}],"links":[{"id":504213,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1038/s41598-026-41803-w","text":"Publisher Index Page"},{"id":504086,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Iowa, Minnesota, Wisconsin","otherGeospatial":"Upper Mississippi River","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -93.6,\n 45.1\n ],\n [\n -90,\n 45.1\n ],\n [\n -90,\n 42.667\n ],\n [\n -93.6,\n 42.667\n ],\n [\n -93.6,\n 45.1\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"16","noUsgsAuthors":false,"publicationDate":"2026-05-06","publicationStatus":"PW","contributors":{"authors":[{"text":"LeRoy, Jessica Z. 0000-0003-4035-6872 jzinger@usgs.gov","orcid":"https://orcid.org/0000-0003-4035-6872","contributorId":174534,"corporation":false,"usgs":true,"family":"LeRoy","given":"Jessica","email":"jzinger@usgs.gov","middleInitial":"Z.","affiliations":[{"id":36532,"text":"Central Midwest Water Science Center","active":true,"usgs":true},{"id":344,"text":"Illinois Water Science Center","active":true,"usgs":true},{"id":35680,"text":"Illinois-Iowa-Missouri Water Science Center","active":true,"usgs":true}],"preferred":true,"id":961320,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Loppnow, Grace","contributorId":344014,"corporation":false,"usgs":false,"family":"Loppnow","given":"Grace","email":"","affiliations":[{"id":6964,"text":"Minnesota Department of Natural Resources","active":true,"usgs":false}],"preferred":false,"id":961321,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Jackson, P. Ryan 0000-0002-3154-6108 pjackson@usgs.gov","orcid":"https://orcid.org/0000-0002-3154-6108","contributorId":194529,"corporation":false,"usgs":true,"family":"Jackson","given":"P.","email":"pjackson@usgs.gov","middleInitial":"Ryan","affiliations":[{"id":36532,"text":"Central Midwest Water Science Center","active":true,"usgs":true},{"id":35680,"text":"Illinois-Iowa-Missouri Water Science Center","active":true,"usgs":true},{"id":344,"text":"Illinois Water Science Center","active":true,"usgs":true}],"preferred":true,"id":961322,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Lasher, G. Everett 0000-0001-6975-8264","orcid":"https://orcid.org/0000-0001-6975-8264","contributorId":371225,"corporation":false,"usgs":false,"family":"Lasher","given":"G.","middleInitial":"Everett","affiliations":[{"id":7197,"text":"Unaffiliated","active":true,"usgs":false}],"preferred":false,"id":961323,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70275797,"text":"70275797 - 2026 - Water scarcity and infrastructure risk of amplified seasonal sediment transport","interactions":[],"lastModifiedDate":"2026-05-19T14:28:32.16682","indexId":"70275797","displayToPublicDate":"2026-05-06T09:22:56","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":5791,"text":"Nature Sustainability","active":true,"publicationSubtype":{"id":10}},"title":"Water scarcity and infrastructure risk of amplified seasonal sediment transport","docAbstract":"Climate warming and deglaciation are reshaping hydrological seasonality in cold–dry regions, threatening the long-term sustainability of agriculture, ecosystems and local communities. However, existing evidence is limited to runoff seasonality. Changing sediment-transport seasonality, a more sensitive component, is emerging as a substantial yet under-recognized threat to water infrastructure. Leveraging monthly observations from the upper Tarim River from the 1960s to 2000s, we show that a warmer and wetter climate has intensified sediment-transport seasonality, with a 43% increase in summer sediment fluxes. Over half of this amplification stems from more frequent extreme sediment transport, particularly events triggered by high sediment supply rather than high discharge. Supported by a state-of-the-art river change dataset, we show that enhanced sediment seasonality and extreme sediment transport have largely contributed to increased river mobility since 2000. Sediment-driven changes are pushing riverine processes towards greater unpredictability and pose growing threats to water infrastructure and water security in vulnerable cold–dry regions.
","language":"English","publisher":"Nature","doi":"10.1038/s41893-026-01829-4","usgsCitation":"Zhang, T., Best, J.L., East, A.E., Rosa, L., Wu, Q., Li, Y., Qi, Y., Li, Y., and Li, D., 2026, Water scarcity and infrastructure risk of amplified seasonal sediment transport: Nature Sustainability, https://doi.org/10.1038/s41893-026-01829-4.","ipdsId":"IP-181090","costCenters":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":504525,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"edition":"Online First","noUsgsAuthors":false,"publicationDate":"2026-05-06","publicationStatus":"PW","contributors":{"authors":[{"text":"Zhang, Ting","contributorId":331672,"corporation":false,"usgs":false,"family":"Zhang","given":"Ting","affiliations":[],"preferred":false,"id":961783,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Best, Jim L.","contributorId":147995,"corporation":false,"usgs":false,"family":"Best","given":"Jim","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":961784,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"East, Amy E. 0000-0002-9567-9460 aeast@usgs.gov","orcid":"https://orcid.org/0000-0002-9567-9460","contributorId":196364,"corporation":false,"usgs":true,"family":"East","given":"Amy","email":"aeast@usgs.gov","middleInitial":"E.","affiliations":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":961785,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Rosa, Lorenzo","contributorId":209959,"corporation":false,"usgs":false,"family":"Rosa","given":"Lorenzo","email":"","affiliations":[{"id":36942,"text":"University of California, Berkeley","active":true,"usgs":false}],"preferred":false,"id":961786,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Wu, Qianhan","contributorId":371409,"corporation":false,"usgs":false,"family":"Wu","given":"Qianhan","affiliations":[{"id":88135,"text":"School of Biological Sciences and Institute for Climate and Carbon Neutrality, The University of Hong Kong","active":true,"usgs":false}],"preferred":false,"id":961787,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Li, Yiyi","contributorId":371410,"corporation":false,"usgs":false,"family":"Li","given":"Yiyi","affiliations":[{"id":88136,"text":"College of Water Resources and Civil Engineering, China Agricultural University","active":true,"usgs":false}],"preferred":false,"id":961788,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Qi, Yu","contributorId":371412,"corporation":false,"usgs":false,"family":"Qi","given":"Yu","affiliations":[],"preferred":false,"id":961791,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Li, Yunkai","contributorId":371411,"corporation":false,"usgs":false,"family":"Li","given":"Yunkai","affiliations":[{"id":88136,"text":"College of Water Resources and Civil Engineering, China Agricultural University","active":true,"usgs":false}],"preferred":false,"id":961789,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Li, Dongfeng","contributorId":297068,"corporation":false,"usgs":false,"family":"Li","given":"Dongfeng","email":"","affiliations":[{"id":64287,"text":"National University of Singapore","active":true,"usgs":false}],"preferred":false,"id":961790,"contributorType":{"id":1,"text":"Authors"},"rank":9}]}} ,{"id":70276467,"text":"70276467 - 2026 - Restoration in motion: Expanded migration and distribution of silver redhorse Moxostoma anisurum and shorthead redhorse M. macrolepidotum","interactions":[],"lastModifiedDate":"2026-06-08T13:16:07.262292","indexId":"70276467","displayToPublicDate":"2026-05-06T09:08:43","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1169,"text":"Canadian Journal of Fisheries and Aquatic Sciences","active":true,"publicationSubtype":{"id":10}},"displayTitle":"Restoration in motion: Expanded migration and distribution of silver redhorse Moxostoma anisurum and shorthead redhorse M. macrolepidotum","title":"Restoration in motion: Expanded migration and distribution of silver redhorse Moxostoma anisurum and shorthead redhorse M. macrolepidotum","docAbstract":"Habitat fragmentation poses a significant threat to migratory species. Dams are a common form of fragmentation, and recent restoration efforts around the Great Lakes have prioritized dam removal. We used acoustic telemetry to describe migratory movements of two redhorse species in the Sandusky and Cuyahoga rivers, Ohio, USA in relationship to habitat reconnection. Shorthead redhorse (Moxostoma macrolepidotum) typically migrated from both rivers into Lake Erie between May and July, moving 40–248 km straight-line distance from the river before returning the following spring. We recorded individual cumulative distances up to 809 km between spawning seasons. Shorthead redhorse demonstrated tributary fidelity, but individuals from both rivers co-occurred along southern Lake Erie. Silver redhorse (M. anisurum) largely remained in their tagging tributary watersheds year-round. Cuyahoga River silver redhorse moved upstream from March to April 28.8 km on average and passed upstream of the historical Brecksville Dam (removed in 2020), occasionally reaching the next upstream dam. Telemetry data revealed redhorse use of newly available habitat upstream of dam removals and previously undescribed long-range adfluvial migration by shorthead redhorse.
","language":"English","publisher":"Canadian Science Publishing","doi":"10.1139/cjfas-2025-0330","usgsCitation":"Bonjour, S.M., Roberts, J.J., Mills, M.A., Walters, D., Mueller, A.T., Fischer, N.D., Trimbath, R.J., Wagner, C.P., Jenkins, P.I., and Acre, M.R., 2026, Restoration in motion: Expanded migration and distribution of silver redhorse Moxostoma anisurum and shorthead redhorse M. macrolepidotum: Canadian Journal of Fisheries and Aquatic Sciences, v. 83, p. 1-13, https://doi.org/10.1139/cjfas-2025-0330.","productDescription":"13 p.","startPage":"1","endPage":"13","ipdsId":"IP-183824","costCenters":[{"id":192,"text":"Columbia Environmental Research Center","active":true,"usgs":true},{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"links":[{"id":505465,"rank":2,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1139/cjfas-2025-0330","text":"Publisher Index Page"},{"id":505089,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Ohio","otherGeospatial":"Cuyahoga River, Sandusky River","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -82.99957437904655,\n 41.455123996119426\n ],\n [\n -83.15876511531583,\n 41.455123996119426\n ],\n [\n -83.15759076931299,\n 41.29563625906624\n ],\n [\n -82.99922556340212,\n 41.29563625906624\n ],\n [\n -82.99957437904655,\n 41.455123996119426\n ]\n ]\n ]\n }\n },\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -81.79589612495593,\n 41.50836069209177\n ],\n [\n -81.4024573976178,\n 41.50836069209177\n ],\n [\n -81.40795017590118,\n 41.07604448536253\n ],\n [\n -81.79726538487185,\n 41.07604448536253\n ],\n [\n -81.79589612495593,\n 41.50836069209177\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"83","noUsgsAuthors":false,"publicationDate":"2026-05-06","publicationStatus":"PW","contributors":{"authors":[{"text":"Bonjour, Sophia Marie 0000-0003-3614-7023","orcid":"https://orcid.org/0000-0003-3614-7023","contributorId":335936,"corporation":false,"usgs":true,"family":"Bonjour","given":"Sophia","email":"","middleInitial":"Marie","affiliations":[{"id":192,"text":"Columbia Environmental Research Center","active":true,"usgs":true}],"preferred":true,"id":962455,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Roberts, James J. 0000-0002-4193-610X jroberts@usgs.gov","orcid":"https://orcid.org/0000-0002-4193-610X","contributorId":5453,"corporation":false,"usgs":true,"family":"Roberts","given":"James","email":"jroberts@usgs.gov","middleInitial":"J.","affiliations":[{"id":191,"text":"Colorado Water Science Center","active":true,"usgs":true},{"id":291,"text":"Fort Collins Science Center","active":true,"usgs":true},{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"preferred":true,"id":962456,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Mills, Marc A.","contributorId":371845,"corporation":false,"usgs":false,"family":"Mills","given":"Marc","middleInitial":"A.","affiliations":[{"id":6784,"text":"US EPA","active":true,"usgs":false}],"preferred":false,"id":962457,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Walters, David 0000-0002-4237-2158","orcid":"https://orcid.org/0000-0002-4237-2158","contributorId":203410,"corporation":false,"usgs":true,"family":"Walters","given":"David","affiliations":[{"id":291,"text":"Fort Collins Science Center","active":true,"usgs":true},{"id":192,"text":"Columbia Environmental Research Center","active":true,"usgs":true}],"preferred":true,"id":962458,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Mueller, Andrew T. 0000-0001-8566-8023","orcid":"https://orcid.org/0000-0001-8566-8023","contributorId":238278,"corporation":false,"usgs":true,"family":"Mueller","given":"Andrew","email":"","middleInitial":"T.","affiliations":[{"id":192,"text":"Columbia Environmental Research Center","active":true,"usgs":true}],"preferred":true,"id":962459,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Fischer, Nicholas David 0009-0002-7348-0773","orcid":"https://orcid.org/0009-0002-7348-0773","contributorId":371846,"corporation":false,"usgs":true,"family":"Fischer","given":"Nicholas","middleInitial":"David","affiliations":[{"id":192,"text":"Columbia Environmental Research Center","active":true,"usgs":true}],"preferred":true,"id":962460,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Trimbath, Ryan J.","contributorId":371847,"corporation":false,"usgs":false,"family":"Trimbath","given":"Ryan","middleInitial":"J.","affiliations":[{"id":36189,"text":"National Park Service","active":true,"usgs":false}],"preferred":false,"id":962461,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Wagner, Curtis P.","contributorId":371848,"corporation":false,"usgs":false,"family":"Wagner","given":"Curtis","middleInitial":"P.","affiliations":[{"id":16232,"text":"Ohio Department of Natural Resources","active":true,"usgs":false}],"preferred":false,"id":962462,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Jenkins, Peter I.","contributorId":371849,"corporation":false,"usgs":false,"family":"Jenkins","given":"Peter","middleInitial":"I.","affiliations":[{"id":16232,"text":"Ohio Department of Natural Resources","active":true,"usgs":false}],"preferred":false,"id":962463,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Acre, Matthew Ross 0000-0002-5417-9523","orcid":"https://orcid.org/0000-0002-5417-9523","contributorId":268034,"corporation":false,"usgs":true,"family":"Acre","given":"Matthew","email":"","middleInitial":"Ross","affiliations":[{"id":192,"text":"Columbia Environmental Research Center","active":true,"usgs":true}],"preferred":true,"id":962464,"contributorType":{"id":1,"text":"Authors"},"rank":10}]}} ,{"id":70276604,"text":"70276604 - 2026 - A 40,000-year packrat midden series from Cataviña, central Baja California, Mexico","interactions":[],"lastModifiedDate":"2026-06-11T14:02:26.845427","indexId":"70276604","displayToPublicDate":"2026-05-06T08:58:28","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3218,"text":"Quaternary Research","active":true,"publicationSubtype":{"id":10}},"title":"A 40,000-year packrat midden series from Cataviña, central Baja California, Mexico","docAbstract":"Thirty packrat (Neotoma spp.) middens collected from boulder fields near Cataviña, Baja California, Mexico, at 640–680 m elevation provide the first long chronology of macrofossils and pollen spanning the late Quaternary in the Central Desert of Baja California. Midden plant macrofossil and pollen assemblages document a rich chaparral/woodland assemblage during the last glacial and early Holocene dominated by Parry pinyon (Pinus quadrifolia) and California juniper (Juniperus californica) until 11,630 cal yr BP. This indicates chaparral/woodland had a much more extensive distribution in what are now desert elevations in northern and central Baja California. In contrast to late glacial and early Holocene midden records from northeastern Baja, the Cataviña middens of the same age lack plants adapted to warm season precipitation, suggesting that decreased temperatures and evapotranspiration during the growing season and enhanced winter precipitation, with little contribution from summer rains, supported the lowering of chaparral/woodland species distributions in central Baja California. Cataviña middens also record endemic desert plant taxa mixed in with chaparral/woodland species during the Pleistocene, persisting throughout the Holocene, followed by the quick arrival of other desert species after ∼11,000 cal yr BP. Baja California remains a high-potential yet poorly sampled area for packrat midden research in North America.
","language":"English","publisher":"Cambridge University Press","doi":"10.1017/qua.2026.10088","usgsCitation":"Betancourt, J.L., Holmgren, C.H., Rylander, K.A., Van Devender, T.R., and Peñalba, M.C., 2026, A 40,000-year packrat midden series from Cataviña, central Baja California, Mexico: Quaternary Research, https://doi.org/10.1017/qua.2026.10088.","ipdsId":"IP-180561","costCenters":[{"id":554,"text":"Science and Decisions Center","active":true,"usgs":true}],"links":[{"id":505498,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1017/qua.2026.10088","text":"Publisher Index Page"},{"id":505397,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Mexico","state":"Baja California","city":"Cataviña","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -114.84880727224979,\n 29.812078346521616\n ],\n [\n -114.60875688208735,\n 29.812078346521616\n ],\n [\n -114.60875688208735,\n 29.63938812674563\n ],\n [\n -114.84880727224979,\n 29.63938812674563\n ],\n [\n -114.84880727224979,\n 29.812078346521616\n ]\n ]\n ]\n }\n }\n ]\n}","edition":"Online First","noUsgsAuthors":false,"publicationDate":"2026-05-08","publicationStatus":"PW","contributors":{"authors":[{"text":"Betancourt, Julio L. 0000-0002-7165-0743 jlbetanc@usgs.gov","orcid":"https://orcid.org/0000-0002-7165-0743","contributorId":3376,"corporation":false,"usgs":true,"family":"Betancourt","given":"Julio","email":"jlbetanc@usgs.gov","middleInitial":"L.","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true},{"id":554,"text":"Science and Decisions Center","active":true,"usgs":true},{"id":436,"text":"National Research Program - Eastern Branch","active":true,"usgs":true}],"preferred":true,"id":962796,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Holmgren, Camille H.","contributorId":372114,"corporation":false,"usgs":false,"family":"Holmgren","given":"Camille","middleInitial":"H.","affiliations":[{"id":88260,"text":"SUNY Buffalo State University","active":true,"usgs":false}],"preferred":false,"id":962797,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Rylander, Kate A.","contributorId":372115,"corporation":false,"usgs":false,"family":"Rylander","given":"Kate","middleInitial":"A.","affiliations":[{"id":88261,"text":"Retired federal scientist","active":true,"usgs":false}],"preferred":false,"id":962798,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Van Devender, Thomar R.","contributorId":372116,"corporation":false,"usgs":false,"family":"Van Devender","given":"Thomar","middleInitial":"R.","affiliations":[{"id":88262,"text":"Greater Good Charities","active":true,"usgs":false}],"preferred":false,"id":962799,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Peñalba, M. Cristina","contributorId":372117,"corporation":false,"usgs":false,"family":"Peñalba","given":"M.","middleInitial":"Cristina","affiliations":[{"id":40545,"text":"Universidad de Sonora","active":true,"usgs":false}],"preferred":false,"id":962800,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70276631,"text":"70276631 - 2026 - Lunar analog study using portable gamma-ray neutron detector: Radiochemical mapping of silicic-to-basaltic volcanic terrains in the San Francisco Volcanic Field, Arizona","interactions":[],"lastModifiedDate":"2026-06-12T15:29:00.014977","indexId":"70276631","displayToPublicDate":"2026-05-06T08:19:00","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1963,"text":"Icarus","active":true,"publicationSubtype":{"id":10}},"title":"Lunar analog study using portable gamma-ray neutron detector: Radiochemical mapping of silicic-to-basaltic volcanic terrains in the San Francisco Volcanic Field, Arizona","docAbstract":"Studying lunar silicic volcanism provides key insights into the Moon’s crustal evolution, magmatic processes, and volcanic history. The Lunar-VISE (Lunar Vulkan Imaging and Spectroscopy Explorer) mission will investigate the Gruithuisen domes, a unique lunar region hypothesized to have formed through silicic volcanism. Using instruments on a Firefly Aerospace lander and a Honeybee Robotics rover, Lunar-VISE will analyze mineralogy, geochemistry, and surface properties to determine the origin and evolution of the domes, with a gamma-ray and neutron spectrometer (LV-GRNS) among its payload instruments.
In preparation for this mission, we conducted preliminary fieldwork using a handheld gamma-ray neutron detector with NaI(Tl) and CsLiYCl:Ce (CLYC) scintillators. This study focuses on various rhyolitic and basaltic volcanic centers in the San Francisco Volcanic Field (SFVF) near Flagstaff, Arizona—specifically Sugarloaf Peak, Bonito Lava Flow, and Robinson Mountain, a region containing several well-characterized lunar analog sites. The SFVF was selected for this study due to its broad compositional diversity spanning basaltic to rhyolitic compositions, its well-preserved volcanic morphologies, and its extensive use in previous NASA field campaigns and astronaut training exercises, making it an ideal terrestrial laboratory for testing planetary exploration techniques. We measured natural radioactivity, specifically from potassium (K), thorium (Th), and uranium (U) and other elements in their decay chains, which serve as diagnostic tracers of magmatic differentiation and crustal evolution processes, to assess geochemical variability across compositionally diverse terrains. The detector’s sensitivity was assessed across varying concentration levels.
Regionally averaged concentrations of radioisotopes were determined by gamma-ray spectroscopy at selected sites. Our measurements reveal significant compositional variations between sites, with Sugarloaf Peak (rhyolitic, silicic dome) exhibiting the highest average radioisotope concentrations (K: 3.29 ± 0.24 wt%, U: 14.35 ± 1.81 ppm, Th: 27.14 ± 2.43 ppm), while Bonito Lava Flow (K: 1.13 ± 0.08 wt%, U: 3.86 ± 0.52 ppm, Th: 7.52 ± 1.02 ppm), and Robinson Mountain (K: 1.46 ± 0.16 wt%, U: 5.59 ± 1.06 ppm, Th: 11.75 ± 1.98 ppm) show lower concentrations aligned with basaltic compositions. Gamma-ray fluxes were elevated by a factor of approximately three to four at Sugarloaf Peak relative to nearby basaltic terrains, consistent with expected geochemical differentiation patterns. Furthermore, at meter scales, proximity to geological features significantly affects measurements. Th concentrations adjacent to a cliff face at Sugarloaf’s base were 28% higher than values measured 3-5 meters away from the same feature, demonstrating localized compositional heterogeneity. Analysis of station-by-station measurements reveals that K, U, and Th concentrations show an elevation trend at Robinson Mountain and generally higher concentrations near Sugarloaf Peak’s summit, suggesting progressive magmatic differentiation and/or the presence of more evolved lithologies at higher elevations.