Ephemerally flooded playas are common in the southwestern United States and globally in drylands. Often formed in closed basins, playas are depressions which inundate infrequently from local precipitation and streamflow produced near the playa or from upland areas. Few studies have quantified the hydrologic connectivity between upland catchments and playas using observations. Here, we used rain gauge-corrected precipitation from weather radar and water level measurements in 18 playas of the Chihuahuan Desert to identify precipitation thresholds leading to playa inundation over a 6.4-year period. Geospatial data sets on topography, soil properties, and vegetation cover were employed to determine the controls on inundation. Only 9.4% of all precipitation events above 1 mm led to inundation, with 69.8% of all inundations occurring during the North American monsoon (NAM, July-September). Mean and standard deviations (Std) of runoff ratios at all playas were 2.74 ± 4.08% and 3.29 ± 5.19% for annual and NAM periods. At the annual scale, playa inundation occurred when mean precipitation thresholds of 18.3 ± 7.5 mm (event total) and 12.0 ± 4.5 mm/hr (60-min intensity) were exceeded. Across all playas, inundation occurrence and volume were related most strongly to precipitation metrics and catchment area, with secondary controls of soil and terrain properties. The explanatory power of the derived regressions describing the inundation response across the playas were significantly improved when considering their geological origin. As a result, the inundation response classification system could be applied to ephemeral playas in other arid and semiarid landscapes.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2024WR038848","usgsCitation":"Kimsal, C.R., Vivoni, E.R., Sala, O.E., Monger, H.C., and McKenna, O.P., 2026, Hydrologic dynamics of ephemerally flooded playas in a dryland environment: Water Resources Research, v. 62, no. 1, e2024WR038848, 29 p., https://doi.org/10.1029/2024WR038848.","productDescription":"e2024WR038848, 29 p.","ipdsId":"IP-171696","costCenters":[{"id":480,"text":"Northern Prairie Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":498933,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2024wr038848","text":"Publisher Index Page"},{"id":498832,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"New Mexico","otherGeospatial":"Jornada Experimental Range","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -106.95352847780691,\n 32.77776073898063\n ],\n [\n -106.95352847780691,\n 32.38877769427931\n ],\n [\n -106.58893585904038,\n 32.38877769427931\n ],\n [\n -106.58893585904038,\n 32.77776073898063\n ],\n [\n -106.95352847780691,\n 32.77776073898063\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"62","issue":"1","noUsgsAuthors":false,"publicationDate":"2026-01-16","publicationStatus":"PW","contributors":{"authors":[{"text":"Kimsal, Charles R.","contributorId":365427,"corporation":false,"usgs":false,"family":"Kimsal","given":"Charles","middleInitial":"R.","affiliations":[{"id":6607,"text":"Arizona State University","active":true,"usgs":false}],"preferred":false,"id":954288,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Vivoni, Enrique R.","contributorId":365428,"corporation":false,"usgs":false,"family":"Vivoni","given":"Enrique","middleInitial":"R.","affiliations":[{"id":6607,"text":"Arizona State University","active":true,"usgs":false}],"preferred":false,"id":954289,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Sala, Osvaldo E.","contributorId":365429,"corporation":false,"usgs":false,"family":"Sala","given":"Osvaldo","middleInitial":"E.","affiliations":[{"id":6607,"text":"Arizona State University","active":true,"usgs":false}],"preferred":false,"id":954290,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Monger, H. Curtis","contributorId":365430,"corporation":false,"usgs":false,"family":"Monger","given":"H.","middleInitial":"Curtis","affiliations":[{"id":12628,"text":"New Mexico State University","active":true,"usgs":false}],"preferred":false,"id":954291,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"McKenna, Owen P. 0000-0002-5937-9436 omckenna@usgs.gov","orcid":"https://orcid.org/0000-0002-5937-9436","contributorId":198598,"corporation":false,"usgs":true,"family":"McKenna","given":"Owen","email":"omckenna@usgs.gov","middleInitial":"P.","affiliations":[{"id":480,"text":"Northern Prairie Wildlife Research Center","active":true,"usgs":true}],"preferred":false,"id":954292,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70273514,"text":"70273514 - 2026 - Monitoring recreation on federally managed lands and waters—Aspects of visitor use","interactions":[],"lastModifiedDate":"2026-01-21T15:04:49.092865","indexId":"70273514","displayToPublicDate":"2026-01-16T09:00:10","publicationYear":"2026","noYear":false,"publicationType":{"id":27,"text":"Preprint"},"publicationSubtype":{"id":32,"text":"Preprint"},"seriesTitle":{"id":23167,"text":"SocArXiv","active":true,"publicationSubtype":{"id":32}},"title":"Monitoring recreation on federally managed lands and waters—Aspects of visitor use","docAbstract":"Federally managed public lands and waters receive about 1 billion recreational visits each year. Data on these visitors can aid in guiding policy decisions, managing resources effectively, and communicating the economic contributions of lands and waters. This report explores the methods used by agencies to collect data on aspects of recreational visitor use to Federal lands and waters (apart from visitation numbers, which are the focus of a companion publication). Aspects of recreational visitor use include visitor demographics, recreational activity participation, visitor satisfaction, visitor attitudes and experiences, trip characteristics, and economic contributions. We review practices used to understand aspects of visitor use across seven Federal agencies, revealing similarities such as the use of visitor intercept surveys and coverage of similar topic area, and differences in how survey programs are operationalized and how specific questions on visitor surveys are worded. We also evaluate emerging technologies, such as geolocated social media and mobile device location data, for their potential to aid in understanding aspects of visitor use. This report concludes with potential opportunities to enhance data collection and coordination, ensuring cost-effective data collection and informed decision-making.
","language":"English","publisher":"SocArXiv","doi":"10.31235/osf.io/usq34_v1","usgsCitation":"Wilkins, E.J., Hanson, D., Boone, W., Wood, S., Crowley, C.S., and Schuster, R., 2026, Monitoring recreation on federally managed lands and waters—Aspects of visitor use: SocArXiv, preprint posted January 16, 2026, https://doi.org/10.31235/osf.io/usq34_v1.","productDescription":"71 p.","ipdsId":"IP-182473","costCenters":[{"id":291,"text":"Fort Collins Science Center","active":true,"usgs":true}],"links":[{"id":498795,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationDate":"2026-01-16","publicationStatus":"PW","contributors":{"authors":[{"text":"Wilkins, Emily J. 0000-0003-3055-4808","orcid":"https://orcid.org/0000-0003-3055-4808","contributorId":328409,"corporation":false,"usgs":true,"family":"Wilkins","given":"Emily","email":"","middleInitial":"J.","affiliations":[{"id":291,"text":"Fort Collins Science Center","active":true,"usgs":true}],"preferred":true,"id":954103,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hanson, Dieta","contributorId":353967,"corporation":false,"usgs":false,"family":"Hanson","given":"Dieta","affiliations":[{"id":6934,"text":"University of Washington","active":true,"usgs":false}],"preferred":false,"id":954104,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Boone, Whitney","contributorId":353968,"corporation":false,"usgs":false,"family":"Boone","given":"Whitney","affiliations":[{"id":82391,"text":"DOI Office of Policy Analysis","active":true,"usgs":false}],"preferred":false,"id":954105,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Wood, Spencer A. 0000-0002-5794-2619","orcid":"https://orcid.org/0000-0002-5794-2619","contributorId":334970,"corporation":false,"usgs":false,"family":"Wood","given":"Spencer A.","affiliations":[{"id":6934,"text":"University of Washington","active":true,"usgs":false}],"preferred":false,"id":954106,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Crowley, Christian S.L.","contributorId":203551,"corporation":false,"usgs":false,"family":"Crowley","given":"Christian","email":"","middleInitial":"S.L.","affiliations":[{"id":36651,"text":"Department of the Interior Office of Policy Analysis","active":true,"usgs":false}],"preferred":false,"id":954107,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Schuster, Rudy 0000-0003-2353-8500 schusterr@usgs.gov","orcid":"https://orcid.org/0000-0003-2353-8500","contributorId":3119,"corporation":false,"usgs":true,"family":"Schuster","given":"Rudy","email":"schusterr@usgs.gov","affiliations":[],"preferred":true,"id":954108,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70273991,"text":"70273991 - 2026 - Gerrard strain Rainbow Trout are not piscivorous in a shallow, polymictic reservoir","interactions":[],"lastModifiedDate":"2026-02-23T15:53:33.416884","indexId":"70273991","displayToPublicDate":"2026-01-16T08:47:46","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2886,"text":"North American Journal of Fisheries Management","active":true,"publicationSubtype":{"id":10}},"title":"Gerrard strain Rainbow Trout are not piscivorous in a shallow, polymictic reservoir","docAbstract":"Objective
Georgetown Lake (Montana, USA) is renowned for its multispecies salmonid fishery. Although many anglers target kokanee Oncorhynchus nerka in Georgetown Lake, the body length of kokanee has typically been considered unsatisfactory. To reduce the density of kokanee and increase the average size, Montana Fish, Wildlife & Parks began stocking the piscivorous Gerrard strain of Rainbow Trout O. mykiss (hereafter “Gerrard”) in 2015 to consume kokanee. In 2020, preliminary evidence suggested that the average length of kokanee greater than 200 mm increased by almost 40 mm.
Methods
To assess the efficacy of biocontrol through the introduction of a piscivore to predate on kokanee, we examined the diet composition of all potential predators (three strains of Rainbow Trout and Brook Trout Salvelinus fontinalis) to determine the amount of predation on kokanee and to understand the feeding ecology of all potential predators.
Results
There was little evidence of piscivory in any predator and no evidence of Gerrards consuming kokanee. Gerrards exhibited a generalist feeding strategy, and there was dietary overlap and no difference in trophic position among Gerrards and other predators.
Conclusions
From a biological-control perspective, there is no benefit in continuing to stock Gerrards to reduce kokanee densities in Georgetown Lake. These findings underscore the challenge of predicting predator–prey relationships, as diet plasticity can lead to unexpected dynamics based on resource availability and habitat structure within aquatic ecosystems, highlighting the importance of evaluating management interventions, such as biocontrols, in different ecosystems.
","language":"English","publisher":"Oxford Academic","doi":"10.1093/najfmt/vqaf116","usgsCitation":"Furey, K.M., Guy, C.S., Liermann, B.W., Saffel, P., Schmetterling, D.A., 2026, Gerrard strain Rainbow Trout are not piscivorous in a shallow, polymictic reservoir: North American Journal of Fisheries Management, v. 46, no. 1, p. 247-258, https://doi.org/10.1093/najfmt/vqaf116.","productDescription":"12 p.","startPage":"247","endPage":"258","ipdsId":"IP-176634","costCenters":[{"id":200,"text":"Coop Res Unit Seattle","active":true,"usgs":true}],"links":[{"id":502571,"rank":0,"type":{"id":41,"text":"Open Access External Repository Page"},"text":"External Repository"},{"id":500408,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Montana","otherGeospatial":"Georgetown Lake","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -113.34012730042863,\n 46.2254998227597\n ],\n [\n -113.34012730042863,\n 46.1590036415387\n ],\n [\n -113.24568530830683,\n 46.1590036415387\n ],\n [\n -113.24568530830683,\n 46.2254998227597\n ],\n [\n -113.34012730042863,\n 46.2254998227597\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"46","issue":"1","noUsgsAuthors":false,"publicationDate":"2026-01-16","publicationStatus":"PW","contributors":{"authors":[{"text":"Furey, Kaitlyn M.","contributorId":366522,"corporation":false,"usgs":false,"family":"Furey","given":"Kaitlyn","middleInitial":"M.","affiliations":[{"id":36555,"text":"Montana State University","active":true,"usgs":false}],"preferred":false,"id":956025,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Guy, Christopher S. 0000-0002-9936-4781 cguy@usgs.gov","orcid":"https://orcid.org/0000-0002-9936-4781","contributorId":2876,"corporation":false,"usgs":true,"family":"Guy","given":"Christopher","email":"cguy@usgs.gov","middleInitial":"S.","affiliations":[{"id":200,"text":"Coop Res Unit Seattle","active":true,"usgs":true},{"id":5062,"text":"Office of the Chief Scientist for Ecosystems","active":true,"usgs":true},{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":956026,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Liermann, Bradley W.","contributorId":366523,"corporation":false,"usgs":false,"family":"Liermann","given":"Bradley","middleInitial":"W.","affiliations":[{"id":87492,"text":"Montana Wildlife and Parks","active":true,"usgs":false}],"preferred":false,"id":956027,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Saffel, Patrick","contributorId":366524,"corporation":false,"usgs":false,"family":"Saffel","given":"Patrick","affiliations":[{"id":87492,"text":"Montana Wildlife and Parks","active":true,"usgs":false}],"preferred":false,"id":956028,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Schmetterling, David A.","contributorId":366525,"corporation":false,"usgs":false,"family":"Schmetterling","given":"David","middleInitial":"A.","affiliations":[{"id":87492,"text":"Montana Wildlife and Parks","active":true,"usgs":false}],"preferred":false,"id":956029,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70273508,"text":"70273508 - 2026 - An integrated mudstone facies classification scheme and revised interpretation of the sedimentologic processes driving carbon burial in the Cenomanian–Turonian Greenhorn Formation, Colorado, U.S.A.","interactions":[],"lastModifiedDate":"2026-01-21T15:13:13.114286","indexId":"70273508","displayToPublicDate":"2026-01-16T08:04:39","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2451,"text":"Journal of Sedimentary Research","onlineIssn":"1938-3681","printIssn":"1527-1404","active":true,"publicationSubtype":{"id":10}},"title":"An integrated mudstone facies classification scheme and revised interpretation of the sedimentologic processes driving carbon burial in the Cenomanian–Turonian Greenhorn Formation, Colorado, U.S.A.","docAbstract":"Standardizing facies descriptions has proven key to integrating interpretations of depositional processes and environments from sedimentologic observations with geochemistry data for mudstone lithologies. Because of their fine-grained nature, high degree of compaction, and heterogeneous composition, standardizing methods for mudstone descriptions has proven difficult, but it is critical to formulating meaningful interpretations of the processes that govern the accumulation of organic-rich lithologies and their role in both petroleum systems and the global carbon cycle. In this study, we have developed a modified facies classification scheme for mudstone lithologies that incorporates sedimentologic and compositional observation at the hand-sample and thin-section scales with geochemical measurements, including bulk organic and inorganic geochemistry, to characterize these rocks and their variability more completely for improved interpretations of depositional environments during a low-order sea-level transgression. The facies described in this study are of the Cenomanian–Turonian Greenhorn Formation in the USGS #1 Portland Core drilled in Fremont County, Colorado. Strata of the Greenhorn Formation span Oceanic Anoxic Event 2 (OAE-2) and the preceding interval. Lithologies range from organic-rich argillaceous mudstones with varied sedimentary structures to organic-lean, highly bioturbated limestones. Six facies were identified, each differentiated by varied sedimentary structures and geochemical composition. These facies occur in a predictable stratigraphic stacking pattern that represents a low-order sea-level transgression with interpreted depositional environments ranging from terrigenous-dominated pro-delta and muddy continental shelf at the base of the interval to pelagic offshore marine at the top of the Greenhorn Formation. Though the facies are consistent with previous interpretations of depositional environments at this locale in the Cretaceous Western Interior Seaway during the Greenhorn cyclothem, the sedimentary processes governing the accumulation of organic-rich strata that have defined this interval are significantly revised. Variability in the proximity and intensity of bottom currents driven by storms and geostrophic flows were key to the accumulation of each facies, with significant sediment transport occurring even through deposition in the most oxygen-depleted bottom waters. The methodology and interpretations provided here are now being employed to basin-scale predictions of organic enrichment utilizing calibrated petrophysical methods. The approach and results from this study improve understanding of how organic and inorganic carbon was sequestered during perturbations to the global carbon cycle associated with events such as OAE-2.
","language":"English","publisher":"GeoScienceWorld","doi":"10.2110/jsr.2024.138","usgsCitation":"Flaum, J.A., French, K.L., Birdwell, J.E., and Timm, K.K., 2026, An integrated mudstone facies classification scheme and revised interpretation of the sedimentologic processes driving carbon burial in the Cenomanian–Turonian Greenhorn Formation, Colorado, U.S.A.: Journal of Sedimentary Research, v. 96, no. 1, p. 1-23, https://doi.org/10.2110/jsr.2024.138.","productDescription":"23 p.","startPage":"1","endPage":"23","ipdsId":"IP-172359","costCenters":[{"id":164,"text":"Central Energy Resources Science Center","active":true,"usgs":true}],"links":[{"id":498799,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Colorado","county":"Fremont County","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -106.0710390315544,\n 38.78981661569202\n ],\n [\n -106.13236791392487,\n 37.86241312434697\n ],\n [\n -104.5947771998546,\n 37.80870262042711\n ],\n [\n -104.5650571117552,\n 38.76694004570902\n ],\n [\n -106.0710390315544,\n 38.78981661569202\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"96","issue":"1","noUsgsAuthors":false,"publicationDate":"2026-01-16","publicationStatus":"PW","contributors":{"authors":[{"text":"Flaum, Jason A. 0000-0003-1251-1142","orcid":"https://orcid.org/0000-0003-1251-1142","contributorId":300809,"corporation":false,"usgs":true,"family":"Flaum","given":"Jason","middleInitial":"A.","affiliations":[{"id":164,"text":"Central Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":954084,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"French, Katherine L. 0000-0002-0153-8035","orcid":"https://orcid.org/0000-0002-0153-8035","contributorId":205462,"corporation":false,"usgs":true,"family":"French","given":"Katherine","email":"","middleInitial":"L.","affiliations":[{"id":164,"text":"Central Energy Resources Science Center","active":true,"usgs":true},{"id":255,"text":"Energy Resources Program","active":true,"usgs":true}],"preferred":false,"id":954085,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Birdwell, Justin E. 0000-0001-8263-1452 jbirdwell@usgs.gov","orcid":"https://orcid.org/0000-0001-8263-1452","contributorId":3302,"corporation":false,"usgs":true,"family":"Birdwell","given":"Justin","email":"jbirdwell@usgs.gov","middleInitial":"E.","affiliations":[{"id":164,"text":"Central Energy Resources Science Center","active":true,"usgs":true},{"id":569,"text":"Southwest Climate Science Center","active":true,"usgs":true},{"id":255,"text":"Energy Resources Program","active":true,"usgs":true}],"preferred":true,"id":954086,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Timm, Kira K. 0000-0002-7439-4626","orcid":"https://orcid.org/0000-0002-7439-4626","contributorId":270009,"corporation":false,"usgs":true,"family":"Timm","given":"Kira","email":"","middleInitial":"K.","affiliations":[{"id":164,"text":"Central Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":954087,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70274137,"text":"70274137 - 2026 - Quantifying post-fire live tree presence and spatial variation using Sentinel-2 time series","interactions":[],"lastModifiedDate":"2026-02-27T14:56:43.851841","indexId":"70274137","displayToPublicDate":"2026-01-16T07:50:46","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1687,"text":"Forest Ecology and Management","active":true,"publicationSubtype":{"id":10}},"title":"Quantifying post-fire live tree presence and spatial variation using Sentinel-2 time series","docAbstract":"Accurate mapping of post-fire surviving trees is important for tracking forest recovery and prioritizing land management decisions. Satellite-based remote sensing is an effective method to assess post-fire forest conditions. Traditionally, differenced satellite-derived burn severity indices are computed by differencing one year pre- and post-fire spectral reflectance values. Differenced burn severity indices are useful for quantifying and mapping the magnitude of ecological change, but their application to detecting and mapping post-fire live trees may not be as appropriate, particularly for delayed tree mortality. Delayed tree mortality (“delayed mortality”) is a phenomenon where trees that initially survive fire then die over an extended period (between one and five years), and it can be challenging to measure and predict. In this study, we demonstrate the potential of mapping delayed mortality using readily available remotely sensed imagery alone. We used random forest models to detect post-fire live trees using 10-m resolution Sentinel-2 data at one-, three-, and five-years post-fire for four fires in the southern Sierra Nevada, California, USA. Using imagery from the National Agriculture Imagery Program (NAIP; 60-cm resolution), we manually classified live tree presence in 6000 Sentinel-2 pixels (500 pixels for each fire-year combination) to calibrate and validate models. Sentinel-2 based model accuracies ranged from 65 % to 86 % with F-scores ranging from 0.52 to 0.86, and their predictions of live pixel area were on average 44 % lower than inferred from more traditional indices such as relative differenced normalized burn ratio (RdNBR). This work represents a promising first step in using freely available post-fire spectral reflectance imagery to detect live trees over an extended period to support post-fire management.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.foreco.2025.123461","usgsCitation":"Saberi, S.J., van Mantgem, P., Wright, M.C., Wong, C.Y., Latimer, A.M., and Young, D.J., 2026, Quantifying post-fire live tree presence and spatial variation using Sentinel-2 time series: Forest Ecology and Management, v. 605, 123461, 11 p., https://doi.org/10.1016/j.foreco.2025.123461.","productDescription":"123461, 11 p.","ipdsId":"IP-180306","costCenters":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"links":[{"id":500812,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1016/j.foreco.2025.123461","text":"Publisher Index Page"},{"id":500643,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","otherGeospatial":"Sequoia National Forest, Sierra National Forest","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -119.12109947611486,\n 37.015918722573474\n ],\n [\n -119.12109947611486,\n 35.62728306165032\n ],\n [\n -117.47104148650808,\n 35.62728306165032\n ],\n [\n -117.47104148650808,\n 37.015918722573474\n ],\n [\n -119.12109947611486,\n 37.015918722573474\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"605","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Saberi, Saba J.","contributorId":367061,"corporation":false,"usgs":false,"family":"Saberi","given":"Saba","middleInitial":"J.","affiliations":[{"id":12711,"text":"UC Davis","active":true,"usgs":false}],"preferred":false,"id":956655,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"van Mantgem, Phillip J. 0000-0002-3068-9422","orcid":"https://orcid.org/0000-0002-3068-9422","contributorId":204320,"corporation":false,"usgs":true,"family":"van Mantgem","given":"Phillip J.","affiliations":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"preferred":true,"id":956656,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wright, Micah C. 0000-0002-5324-1110","orcid":"https://orcid.org/0000-0002-5324-1110","contributorId":229071,"corporation":false,"usgs":true,"family":"Wright","given":"Micah","middleInitial":"C.","affiliations":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"preferred":true,"id":956657,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Wong, Christopher Y.S.","contributorId":367062,"corporation":false,"usgs":false,"family":"Wong","given":"Christopher","middleInitial":"Y.S.","affiliations":[{"id":18889,"text":"University of New Brunswick","active":true,"usgs":false}],"preferred":false,"id":956658,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Latimer, Andrew M.","contributorId":367063,"corporation":false,"usgs":false,"family":"Latimer","given":"Andrew","middleInitial":"M.","affiliations":[{"id":12711,"text":"UC Davis","active":true,"usgs":false}],"preferred":false,"id":956659,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Young, Derek J.N.","contributorId":367064,"corporation":false,"usgs":false,"family":"Young","given":"Derek","middleInitial":"J.N.","affiliations":[{"id":12711,"text":"UC Davis","active":true,"usgs":false}],"preferred":false,"id":956660,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70273386,"text":"sir20255084 - 2026 - Groundwater tracing used to delineate recharge areas and map karst groundwater pathways for subterranean streams at Oregon Caves National Monument and Preserve","interactions":[],"lastModifiedDate":"2026-02-03T17:07:56.82459","indexId":"sir20255084","displayToPublicDate":"2026-01-15T10:31:24","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":"2025-5084","displayTitle":"Groundwater Tracing Used to Delineate Recharge Areas and Map Karst Groundwater Pathways for Subterranean Streams at Oregon Caves National Monument and Preserve","title":"Groundwater tracing used to delineate recharge areas and map karst groundwater pathways for subterranean streams at Oregon Caves National Monument and Preserve","docAbstract":"Oregon Caves National Monument and Preserve in southwestern Oregon is a 4,554-acre area managed by the National Park Service that is home to several cave systems, including Oregon Caves, which is the longest cave in Oregon, with 3.03 miles of mapped passages. Because of the interconnected nature of karst hydrologic systems, it is critical to understand the areas that can influence water quality and quantity in karst environments. Toward this goal, dye tracing was conducted by the U.S. Geological Survey from 2021 to 2024 to better understand the pathways that karst groundwater follows at Oregon Caves National Monument and Preserve and to delineate recharge areas for two caves, Oregon Caves and Cave Next Door. During the project, eight dye injections were conducted, delineating a 0.51-square-mile recharge area for Oregon Caves and a 0.69-square-mile recharge area for Cave Next Door. Additionally, the study helped to identify three resurgences associated with Oregon Caves that were previously unknown and showed that the recharge areas for the two caves were distinct from one another. The dye traces also illuminated some unique recharge characteristics of the karst at Oregon Caves, including a high variance in karst groundwater velocities, retention within the karst aquifers, and a significant diffuse-flow component.
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Critical water supply watersheds in the western United States (WUS) are impacted by wildfires, with potential negative effects on water quality and quantity. Scientific understanding is currently insufficient to deliver estimates of wildfire consequences for water quantity that are regionally accurate. Regional variability in the directionality and magnitude of post-wildfire shifts in streamflow generation fuels uncertainty in estimates of wildfire effects on water supply. In this work we provide a narrative review of wildfire effects on hydrologic processes and the resulting changes in streamflow generation mechanisms with a focus on the WUS, incorporating other global regions when pertinent. A conceptual model summary of wildfire effects on streamflow generation emphasizes: (1) precipitation seasonality, (2) synchrony of precipitation and potential evapotranspiration, (3) net shifts in interception, evaporation, and transpiration relative to total annual precipitation, (4) vegetation changes, including compensatory uptake and type conversion, (5) degree of overlap in rainfall rates and infiltration, (6) fire extent and severity, (7) burn scar positioning (e.g. in headwaters or proximal to watershed outlet), (8) scale-dependent groundwater leakage, (9) near-surface water storage reduction, and (10) soil to groundwater connectivity. Ongoing gaps and challenges include separating the influences of precipitation variability, water withdrawals, and post-fire land management; compound and overlapping disturbances; and lack of pre-fire data. Notable future opportunities include: harnessing ever-improving gridded and remotely sensed precipitation and fire-effects data; linking geophysical, isotopic tracer, and geochemical signatures to diagnose hydrologic changes; leveraging physically based and data-driven model advancements; and analyzing streamflow generation recovery trajectories across diverse watersheds.
","language":"English","publisher":"IOP Publishing","doi":"10.1088/3033-4942/ae2a64","usgsCitation":"Ebel, B.A., Hammond, J., Walvoord, M.A., Partridge, T.F., Rey, D., and Murphy, S.F., 2026, A review and synthesis of post-wildfire shifts in hydrologic processes and streamflow generation mechanisms: Environmental Research: Water, v. 1, no. 4, 042001, 29 p., https://doi.org/10.1088/3033-4942/ae2a64.","productDescription":"042001, 29 p.","ipdsId":"IP-178244","costCenters":[{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true}],"links":[{"id":499330,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1088/3033-4942/ae2a64","text":"Publisher Index Page"},{"id":499183,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"western United States","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -127.12193959016071,\n 49.09854340485592\n ],\n [\n -127.12193959016071,\n 31.217992482905444\n ],\n [\n -103.12645954620436,\n 31.217992482905444\n ],\n [\n -103.12645954620436,\n 49.09854340485592\n ],\n [\n -127.12193959016071,\n 49.09854340485592\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"1","issue":"4","noUsgsAuthors":false,"publicationDate":"2026-01-15","publicationStatus":"PW","contributors":{"authors":[{"text":"Ebel, Brian A. 0000-0002-5413-3963 bebel@usgs.gov","orcid":"https://orcid.org/0000-0002-5413-3963","contributorId":218151,"corporation":false,"usgs":true,"family":"Ebel","given":"Brian","email":"bebel@usgs.gov","middleInitial":"A.","affiliations":[{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true}],"preferred":true,"id":954627,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hammond, John C. 0000-0002-4935-0736","orcid":"https://orcid.org/0000-0002-4935-0736","contributorId":223108,"corporation":false,"usgs":true,"family":"Hammond","given":"John C.","affiliations":[{"id":41514,"text":"Maryland-Delaware-District of Columbia Water Science Center","active":true,"usgs":true}],"preferred":true,"id":954628,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Walvoord, Michelle A. 0000-0003-4269-8366","orcid":"https://orcid.org/0000-0003-4269-8366","contributorId":211843,"corporation":false,"usgs":true,"family":"Walvoord","given":"Michelle","email":"","middleInitial":"A.","affiliations":[{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true}],"preferred":true,"id":954629,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Partridge, Trevor Fuess 0000-0003-1589-4783","orcid":"https://orcid.org/0000-0003-1589-4783","contributorId":302668,"corporation":false,"usgs":true,"family":"Partridge","given":"Trevor","email":"","middleInitial":"Fuess","affiliations":[{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true}],"preferred":true,"id":954630,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Rey, David M. 0000-0003-2629-365X","orcid":"https://orcid.org/0000-0003-2629-365X","contributorId":211848,"corporation":false,"usgs":true,"family":"Rey","given":"David M.","affiliations":[{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true}],"preferred":true,"id":954631,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Murphy, Sheila F. 0000-0002-5481-3635 sfmurphy@usgs.gov","orcid":"https://orcid.org/0000-0002-5481-3635","contributorId":1854,"corporation":false,"usgs":true,"family":"Murphy","given":"Sheila","email":"sfmurphy@usgs.gov","middleInitial":"F.","affiliations":[{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"preferred":true,"id":954632,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70273478,"text":"70273478 - 2026 - Computation of regional groundwater budgets for the Virginia Coastal Plain aquifer system","interactions":[{"subject":{"id":70273478,"text":"70273478 - 2026 - Computation of regional groundwater budgets for the Virginia Coastal Plain aquifer system","indexId":"70273478","publicationYear":"2026","noYear":false,"title":"Computation of regional groundwater budgets for the Virginia Coastal Plain aquifer system"},"predicate":"SUPERSEDED_BY","object":{"id":70275076,"text":"ofr20261002 - 2026 - Computation of regional groundwater budgets for the Virginia Coastal Plain aquifer system","indexId":"ofr20261002","publicationYear":"2026","noYear":false,"title":"Computation of regional groundwater budgets for the Virginia Coastal Plain aquifer system"},"id":1}],"supersededBy":{"id":70275076,"text":"ofr20261002 - 2026 - Computation of regional groundwater budgets for the Virginia Coastal Plain aquifer system","indexId":"ofr20261002","publicationYear":"2026","noYear":false,"title":"Computation of regional groundwater budgets for the Virginia Coastal Plain aquifer system"},"lastModifiedDate":"2026-04-16T18:20:04.469726","indexId":"70273478","displayToPublicDate":"2026-01-15T08:35:29","publicationYear":"2026","noYear":false,"publicationType":{"id":27,"text":"Preprint"},"publicationSubtype":{"id":32,"text":"Preprint"},"seriesTitle":{"id":18346,"text":"EarthArXiv","active":true,"publicationSubtype":{"id":32}},"title":"Computation of regional groundwater budgets for the Virginia Coastal Plain aquifer system","docAbstract":"Computation of detailed groundwater flow budgets for subdivisions of Virginia’s Coastal Plain aquifer system has enabled quantification and more thorough understanding of groundwater flow within this important water resource. A zone budget analysis conducted on previously published groundwater models of the Virginia Coastal Plain and Virginia Eastern Shore shows that groundwater conditions vary substantially throughout the Coastal Plain aquifer system due to local variations in hydrogeology and historical and ongoing variations in groundwater use and management. Decades of substantial groundwater withdrawal from the Coastal Plain aquifer system have fundamentally altered groundwater flow from pre-development conditions. Rates of sustainable withdrawal are limited because the downward groundwater flow rate into confined aquifers supplying groundwater is a relatively small portion of the total groundwater water budget for the aquifer system.
Analyses of groundwater budgets from the Virginia Coastal Plain model show that groundwater flow is generally outward from the surficial aquifer to rivers and coastal water bodies and downward through a series of underlying aquifers and confining units to the Potomac aquifer, which is the deepest aquifer and the source of most groundwater withdrawals. Downward flow into the Potomac aquifer currently is estimated to be only 7 percent of total net precipitation-derived net recharge at the land surface but makes up about 66 percent of inflow to the aquifer in Virginia, with much of the remaining inflow occurring laterally from areas outside of defined groundwater budget regions in Virginia. For several decades prior to 2010, high rates of withdrawal from the Potomac aquifer resulted in substantial decline in groundwater storage in the aquifer and in most overlying aquifers and confining units. From 2010 to 2025, rates of withdrawal substantially lower than the historical maximum have resulted in small net increases in groundwater storage in the confined aquifer system for most regions of the Virginia Coastal Plain. Nevertheless, for the same period, groundwater storage for the entire model domain continues to incrementally decline, indicating that storage recovery in Virginia is offset by a continued decrease in storage in areas beneath the Chesapeake Bay or in adjacent areas of Maryland and North Carolina. Withdrawals from the Potomac aquifer have induced substantial downward flow which is a large part of groundwater budgets for confined aquifers such as the Potomac. Downward groundwater flow continues under current conditions, but because vertical flow rates are a function of the difference between water pressure in the upper surficial systems and lower confined units, those rates are lower than those in earlier decades as the confined water levels partially recover from larger groundwater withdrawals in the past. Geographically, groundwater flow is generally inward from perimeter regions of the Virginia Coastal Plain toward central regions with the largest withdrawal rates. Estimated groundwater inflow from coastal regions could be contributing to saltwater intrusion, though that was not measured directly in this study.
Analyses of groundwater budgets from the Virginia Eastern Shore peninsula, a geographic region of the Virginia Coastal Plain, show that groundwater flow for that isolated aquifer system is generally outward from the surficial aquifer to coastal water bodies and downward into the confined Yorktown-Eastover aquifer system, which is the source of most withdrawals. Downward groundwater flow into the confined Yorktown-Eastover aquifer system is estimated to be less than 2 percent of total recharge and less than 9 percent of net recharge at the water table but makes up over 93 percent of all inflow to the confined aquifer system. Decades of substantial but relatively consistent groundwater withdrawals have induced greater downward flow rates into the confined aquifer system but also have resulted in loss of groundwater from storage. Currently, estimated storage loss accounts for slightly under 7 percent of withdrawals from the confined aquifer system. The current withdrawal rate from the confined Yorktown-Eastover system is near the highest reported rate for the Eastern Shore, which means that the storage depletion is expected to continue, even though groundwater levels appear to be relatively stable. Estimated groundwater flow rates upward from the confining unit underlying the Yorktown-Eastover system and small rates of inflow from coastal water bodies underscore ongoing concerns about up-coning and lateral intrusion of salty groundwater.
Accurate tectonic models are essential for assessing seismic hazard and fault interactions. However, the plate configuration at the complex Mendocino triple junction, where the San Andreas Fault and the Cascadia subduction zone meet, remains uncertain. We analyzed fault slip associated with a recently identified zone of tectonic tremor and low-frequency earthquakes (LFEs) near the southern edge of the subducting Gorda slab. Based on tidal sensitivity and P-wave first motions, we show that the LFEs are generated by dipping, strike-slip motion. This suggests that a former Farallon slab fragment, now captured by the Pacific plate, is translating northward beneath westernmost North America. This geometry effectively extends the slab interface fault, challenging prevailing interpretations of slab window formation and creating a potential unaccounted earthquake hazard in this region.
","language":"English","publisher":"American Association for the Advancement of Science","doi":"10.1126/science.aeb2407","usgsCitation":"Shelly, D.R., Thomas, A.M., Materna, K.Z., and Skoumal, R.J., 2026, Low-frequency earthquakes track the motion of a captured slab fragment: Science, v. 391, no. 6782, p. 294-299, https://doi.org/10.1126/science.aeb2407.","productDescription":"6 p.","startPage":"294","endPage":"299","ipdsId":"IP-180199","costCenters":[{"id":78686,"text":"Geologic Hazards Science Center - Seismology / Geomagnetism","active":true,"usgs":true}],"links":[{"id":498811,"rank":3,"type":{"id":42,"text":"Open Access USGS Document"},"url":"https://pubs.usgs.gov/publication/70273506/full"},{"id":498810,"rank":2,"type":{"id":31,"text":"Publication XML"},"url":"https://pubs.usgs.gov/ja/70273506/70273506.XML"},{"id":498792,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"391","issue":"6782","noUsgsAuthors":false,"publicationDate":"2026-01-15","publicationStatus":"PW","contributors":{"authors":[{"text":"Shelly, David R. 0000-0003-2783-5158 dshelly@usgs.gov","orcid":"https://orcid.org/0000-0003-2783-5158","contributorId":206750,"corporation":false,"usgs":true,"family":"Shelly","given":"David","email":"dshelly@usgs.gov","middleInitial":"R.","affiliations":[{"id":300,"text":"Geologic Hazards Science Center","active":true,"usgs":true},{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":954079,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Thomas, Amanda M.","contributorId":200641,"corporation":false,"usgs":false,"family":"Thomas","given":"Amanda","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":954080,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Materna, Kathryn Z. 0000-0002-6687-980X","orcid":"https://orcid.org/0000-0002-6687-980X","contributorId":209697,"corporation":false,"usgs":false,"family":"Materna","given":"Kathryn","middleInitial":"Z.","affiliations":[{"id":13693,"text":"University of Colorado Boulder","active":true,"usgs":false}],"preferred":false,"id":954081,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Skoumal, Robert J. 0000-0002-5627-6239 rskoumal@usgs.gov","orcid":"https://orcid.org/0000-0002-5627-6239","contributorId":191213,"corporation":false,"usgs":true,"family":"Skoumal","given":"Robert","email":"rskoumal@usgs.gov","middleInitial":"J.","affiliations":[{"id":237,"text":"Earthquake Science Center","active":true,"usgs":true}],"preferred":true,"id":954082,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70274087,"text":"70274087 - 2026 - Ground-motion simulations for the 2024 Mw 4.8 Tewksbury, New Jersey, earthquake","interactions":[],"lastModifiedDate":"2026-02-25T14:24:47.080909","indexId":"70274087","displayToPublicDate":"2026-01-15T08:01:06","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3372,"text":"Seismological Research Letters","onlineIssn":"1938-2057","printIssn":"0895-0695","active":true,"publicationSubtype":{"id":10}},"displayTitle":"Ground-motion simulations for the 2024 Mw 4.8 Tewksbury, New Jersey, earthquake","title":"Ground-motion simulations for the 2024 Mw 4.8 Tewksbury, New Jersey, earthquake","docAbstract":"Ground-motion simulations of notable earthquakes in the central and eastern United States are limited and typically assume one-dimensional (1D) Earth structure. In this study, we use a three-dimensional (3D) seismic velocity model to better constrain the depth and focal mechanism of the April 5th, 2024, moment magnitude 4.8 Tewksbury earthquake and investigate the spatial variability of earthquake ground motions and the effects of nearby sedimentary basins. We perform earthquake ground-motion simulations up to 0.5 Hz using the 3D spectral-element wave-propagation solver SPECFEM3D over a region 280-km wide by 260-km long by 77-km deep. Topography and subsurface geophysical structure are assigned using the U.S. Geological Survey National Crustal Model with a minimum shear-wave velocity of 200 m/s. We use earthquake time series from 13 broadband seismic stations in the region that have a uniform azimuthal distribution and epicentral distances ranging from 76 to 131 km to compare with synthetics and explore the effects of 1D versus 3D seismic structure on focal mechanism and depth solutions. Ground-motion intensity metrics are also presented relative to the NGA-East ground-motion models (GMMs) currently used in seismic hazard assessments for the region. We find that the 3D model, which reveals a wide spatial variability of period-dependent ground motions, yields better predictions of earthquake ground motions relative to the 1D model and the NGA-East ergodic ground-motion model, with 76 percent reduction of residual variance in observed ground motions averaged over 3-, 5-, 7-, and 10-second periods. Use of the 3D model to solve for a focal mechanism yields a shallower focal depth at 4 km and a shallower east-dipping focal plane relative to the U.S. Geological Survey regional moment tensor and Global Centroid Moment Tensor. Our study demonstrates that use of 3D seismic velocity models can improve estimates of earthquake focal mechanisms, ground motions, and seismic hazard.","language":"English","publisher":"Seismological Society of America","doi":"10.1785/0220250333","usgsCitation":"Boyd, O.S., Bozdağ, E., Kehoe, H.L., Moschetti, M.P., 2026, Ground-motion simulations for the 2024 Mw 4.8 Tewksbury, New Jersey, earthquake: Seismological Research Letters, v. 97, no. 2A, p. 755-766, https://doi.org/10.1785/0220250333.","productDescription":"12 p.","startPage":"755","endPage":"766","ipdsId":"IP-184176","costCenters":[{"id":78686,"text":"Geologic Hazards Science Center - Seismology / Geomagnetism","active":true,"usgs":true}],"links":[{"id":500604,"rank":2,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1785/0220250333","text":"Publisher Index Page"},{"id":500477,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"New Jersey","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -75.13460496006654,\n 41.13685910148769\n ],\n [\n -75.13460496006654,\n 40.31012949967425\n ],\n [\n -74.00929946762524,\n 40.31012949967425\n ],\n [\n -74.00929946762524,\n 41.13685910148769\n ],\n [\n -75.13460496006654,\n 41.13685910148769\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"97","issue":"2A","noUsgsAuthors":false,"publicationDate":"2026-01-15","publicationStatus":"PW","contributors":{"authors":[{"text":"Boyd, Oliver S. 0000-0001-9457-0407 olboyd@usgs.gov","orcid":"https://orcid.org/0000-0001-9457-0407","contributorId":140739,"corporation":false,"usgs":true,"family":"Boyd","given":"Oliver","email":"olboyd@usgs.gov","middleInitial":"S.","affiliations":[{"id":237,"text":"Earthquake Science Center","active":true,"usgs":true},{"id":300,"text":"Geologic Hazards Science Center","active":true,"usgs":true},{"id":234,"text":"Earthquake Hazards Program","active":true,"usgs":true}],"preferred":true,"id":956499,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bozdağ, Ebru","contributorId":365873,"corporation":false,"usgs":false,"family":"Bozdağ","given":"Ebru","affiliations":[{"id":6606,"text":"Colorado School of Mines","active":true,"usgs":false}],"preferred":false,"id":956500,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Kehoe, Haiyang Liam 0000-0002-5818-6077","orcid":"https://orcid.org/0000-0002-5818-6077","contributorId":362101,"corporation":false,"usgs":true,"family":"Kehoe","given":"Haiyang","middleInitial":"Liam","affiliations":[{"id":78686,"text":"Geologic Hazards Science Center - Seismology / Geomagnetism","active":true,"usgs":true}],"preferred":true,"id":956501,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Moschetti, Morgan P. 0000-0001-7261-0295 mmoschetti@usgs.gov","orcid":"https://orcid.org/0000-0001-7261-0295","contributorId":1662,"corporation":false,"usgs":true,"family":"Moschetti","given":"Morgan","email":"mmoschetti@usgs.gov","middleInitial":"P.","affiliations":[{"id":300,"text":"Geologic Hazards Science Center","active":true,"usgs":true}],"preferred":true,"id":956502,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70273408,"text":"fs20263059 - 2026 - Assessment of undiscovered continuous and conventional oil and gas resources in the Woodford and Barnett Shales of the Permian Basin Province, Texas and New Mexico, 2025","interactions":[],"lastModifiedDate":"2026-02-03T17:07:11.184152","indexId":"fs20263059","displayToPublicDate":"2026-01-14T11:50:00","publicationYear":"2026","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":313,"text":"Fact Sheet","code":"FS","onlineIssn":"2327-6932","printIssn":"2327-6916","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2026-3059","displayTitle":"Assessment of Undiscovered Continuous and Conventional Oil and Gas Resources in the Woodford and Barnett Shales of the Permian Basin Province, Texas and New Mexico, 2025","title":"Assessment of undiscovered continuous and conventional oil and gas resources in the Woodford and Barnett Shales of the Permian Basin Province, Texas and New Mexico, 2025","docAbstract":"Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean continuous and conventional resources of 1.6 billion barrels of oil and 28.3 trillion cubic feet of gas in the Woodford and Barnett Shales of the Permian Basin Province.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston VA","doi":"10.3133/fs20263059","programNote":"National and Global Petroleum Assessment","usgsCitation":"Cicero, A.D., Schenk, C.J., Lagesse, J.H., Johnson, B.G., Mercier, T.J., Leathers-Miller, H.M., Gelman, S.E., Hearon, J.S., and Le, P.A., 2026, Assessment of undiscovered continuous and conventional oil and gas resources in the Woodford and Barnett Shales of the Permian Basin Province, Texas and New Mexico, 2025: U.S. Geological Survey Fact Sheet 2026–3059, 4 p., https://doi.org/10.3133/fs20263059.","productDescription":"Report: 4 p,; Data Release","onlineOnly":"Y","ipdsId":"IP-179456","costCenters":[{"id":164,"text":"Central Energy Resources Science Center","active":true,"usgs":true}],"links":[{"id":498559,"rank":3,"type":{"id":30,"text":"Data Release"},"url":"https://doi.org/10.5066/P13P5ZGT","text":"USGS data release","linkHelpText":"USGS National and Global Oil and Gas Assessment Project—Permian Basin Province, Woodford Shale and Barnett Shale Conventional and Continuous Assessment Unit Boundaries, Assessment Input Data, and Fact Sheet Data Tables"},{"id":498556,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/fs/2026/3059/coverthb.jpg"},{"id":498906,"rank":7,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_119161.htm","linkFileType":{"id":5,"text":"html"}},{"id":498624,"rank":6,"type":{"id":39,"text":"HTML Document"},"url":"https://pubs.usgs.gov/publication/fs20263059/full","text":"Report","linkFileType":{"id":5,"text":"html"},"description":"FS 2026-3059"},{"id":498620,"rank":5,"type":{"id":31,"text":"Publication XML"},"url":"https://pubs.usgs.gov/fs/2026/3059/fs20263059.xml"},{"id":498619,"rank":4,"type":{"id":34,"text":"Image Folder"},"url":"https://pubs.usgs.gov/fs/2026/3059/images"},{"id":498557,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/fs/2026/3059/fs20263059.pdf","text":"Report","size":"6.60 MB","linkFileType":{"id":1,"text":"pdf"},"description":"FS 2026-3059"}],"country":"United States","state":"New Mexico, Texas","otherGeospatial":"Woodford and Barnett Shales","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -105,\n 33\n ],\n [\n -105,\n 30\n ],\n [\n -101.5,\n 30\n ],\n [\n -101.5,\n 33\n ],\n [\n -105,\n 33\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","contact":"Director, Central Energy Resources Science Center
U.S. Geological Survey
Box 25046, MS-939
Denver, CO 80225-0046
The hydrologic regime of the upper Mississippi River (UMR) has become wetter, with greater discharges, longer-lasting high-flow conditions, and seasonal shifts in these patterns over the past several decades. How these changes are expressed spatially as floodplain inundation area, frequency, depth, duration, and timing is not well understood. It is also unclear to what degree spatial patterns of submergence are represented by examining discharge data alone. We assessed changes in floodplain inundation characteristics from 1940 to 2022 in navigation pools 3–10 of the UMR using a geospatial model to simulate daily inundation depths. Inundation characteristics shifted significantly across pools, but the direction and magnitude of change varied by pool and metric. Characteristics summarized at the pool scale correlated with streamgage-derived proxies but the strength of the relationship varied. Within pools, variability in inundation trends highlighted the importance of spatially explicit modeling. Our study demonstrates that changes in discharge over 83 years have manifested across the UMR floodplain in ways that may have consequences for ecological patterns and processes. By mapping hydrologically sensitive areas, we can anticipate which areas may be susceptible to additional shifts in river discharge in a climatically uncertain future.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2025WR040614","usgsCitation":"Van Appledorn, M., De Jager, N.R., Rohweder, J.J., Windmuller-Campione, M., and Griffin, D., 2026, More water, more of the time: Spatial changes in flooding over 83 years in the upper Mississippi River floodplain and relationships with streamgage-derived proxies: Water Resources Research, v. 62, no. 1, e2025WR040614, 20 p., https://doi.org/10.1029/2025WR040614.","productDescription":"e2025WR040614, 20 p.","ipdsId":"IP-177472","costCenters":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"links":[{"id":499320,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2025wr040614","text":"Publisher Index Page"},{"id":499099,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Iowa, Minnesota, Wiscosnin","otherGeospatial":"Upper Mississippi River floodplain","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -94.18148467325908,\n 45.61816060242495\n ],\n [\n -94.18148467325908,\n 42.68629353773204\n ],\n [\n -90.60968047878275,\n 42.68629353773204\n ],\n [\n -90.60968047878275,\n 45.61816060242495\n ],\n [\n -94.18148467325908,\n 45.61816060242495\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"62","issue":"1","noUsgsAuthors":false,"publicationDate":"2026-01-14","publicationStatus":"PW","contributors":{"authors":[{"text":"Van Appledorn, Molly 0000-0002-8029-0014","orcid":"https://orcid.org/0000-0002-8029-0014","contributorId":205785,"corporation":false,"usgs":true,"family":"Van Appledorn","given":"Molly","email":"","affiliations":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"preferred":true,"id":954525,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"De Jager, Nathan R. 0000-0002-6649-4125 ndejager@usgs.gov","orcid":"https://orcid.org/0000-0002-6649-4125","contributorId":3717,"corporation":false,"usgs":true,"family":"De Jager","given":"Nathan","email":"ndejager@usgs.gov","middleInitial":"R.","affiliations":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"preferred":true,"id":954526,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Rohweder, Jason J. 0000-0001-5131-9773 jrohweder@usgs.gov","orcid":"https://orcid.org/0000-0001-5131-9773","contributorId":150539,"corporation":false,"usgs":true,"family":"Rohweder","given":"Jason","email":"jrohweder@usgs.gov","middleInitial":"J.","affiliations":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"preferred":true,"id":954527,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Windmuller-Campione, Marcella","contributorId":292936,"corporation":false,"usgs":false,"family":"Windmuller-Campione","given":"Marcella","email":"","affiliations":[{"id":6626,"text":"University of Minnesota","active":true,"usgs":false}],"preferred":false,"id":954528,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Griffin, Daniel","contributorId":203862,"corporation":false,"usgs":false,"family":"Griffin","given":"Daniel","email":"","affiliations":[{"id":36733,"text":"Department of Geography, Environment &Society, University of Minnesota","active":true,"usgs":false}],"preferred":false,"id":954529,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70273697,"text":"70273697 - 2026 - A new inventory and conservation assessment of United States islands","interactions":[],"lastModifiedDate":"2026-01-23T15:37:26.19888","indexId":"70273697","displayToPublicDate":"2026-01-14T09:24:52","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":5419,"text":"Annals of the American Association of Geographers","active":true,"publicationSubtype":{"id":10}},"title":"A new inventory and conservation assessment of United States islands","docAbstract":"To support conservation-focused research and management we developed a new 30-m resolution polygon data layer of the nonlacustrine and nonriverine islands of the United States, with associated attributes describing key physical and conservation geography characteristics. Islands were grouped into a three-tiered hierarchy of island regions (twelve), island provinces (twenty-eight), and individual islands (19,023). Islands were classified as either continental or oceanic based on their physiographic position relative to the North America continental shelf, and estuarine versus nonestuarine depending on their location within or external to estuaries. For each island we assessed the diversity of terrestrial and coastal ecosystems, the number of threatened and endangered (T&E) species listed under the Endangered Species Act, the number of T&E species critical habitats, the number of migratory bird species listed under the Migratory Bird Treaty Act, the number of Key Biodiversity Areas, and the number of and management responsibility for protected areas. We conclude that the conservation importance of islands is disproportionate to their total area as, for example, islands contain 52 percent of the T&E species yet their total area is only 2 percent of the area of the continental mainland. Similarly, of the global total of 431 World Terrestrial Ecosystems, 201 (47 percent) occur on U.S. islands compared with 286 (66 percent) that occur on the U.S. continental mainland.
","language":"English","publisher":"Taylor and Francis","doi":"10.1080/24694452.2025.2604843","usgsCitation":"Sayre, R., Martin, M.T., Naji, N., Sides, K.B., Cress, J., Butler, K., Van Graafeiland, K., Karagulle, D., Frye, C., Breyer, S., Wright, D., Klavitter, J., Spatz, D., Will, D., Howald, G., Wegmann, A., Stanley, C., and Holmes, N., 2026, A new inventory and conservation assessment of United States islands: Annals of the American Association of Geographers, https://doi.org/10.1080/24694452.2025.2604843.","ipdsId":"IP-171404","costCenters":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true},{"id":5055,"text":"Land Change Science","active":true,"usgs":true}],"links":[{"id":499311,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1080/24694452.2025.2604843","text":"Publisher Index Page"},{"id":498993,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","edition":"Online First","noUsgsAuthors":false,"publicationDate":"2026-01-14","publicationStatus":"PW","contributors":{"authors":[{"text":"Sayre, Roger 0000-0001-6703-7105","orcid":"https://orcid.org/0000-0001-6703-7105","contributorId":302356,"corporation":false,"usgs":true,"family":"Sayre","given":"Roger","affiliations":[{"id":5055,"text":"Land Change Science","active":true,"usgs":true}],"preferred":true,"id":954313,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Martin, Madeline T. 0000-0002-2704-1879","orcid":"https://orcid.org/0000-0002-2704-1879","contributorId":261694,"corporation":false,"usgs":true,"family":"Martin","given":"Madeline","email":"","middleInitial":"T.","affiliations":[{"id":5055,"text":"Land Change Science","active":true,"usgs":true}],"preferred":true,"id":954314,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Naji, Nadia 0000-0001-9039-1655","orcid":"https://orcid.org/0000-0001-9039-1655","contributorId":360509,"corporation":false,"usgs":false,"family":"Naji","given":"Nadia","affiliations":[],"preferred":false,"id":954384,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Sides, Kelly B. 0000-0003-1107-3355","orcid":"https://orcid.org/0000-0003-1107-3355","contributorId":360508,"corporation":false,"usgs":true,"family":"Sides","given":"Kelly","middleInitial":"B.","affiliations":[{"id":5055,"text":"Land Change Science","active":true,"usgs":true}],"preferred":true,"id":954316,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Cress, Jill Janene 0000-0002-3148-8374","orcid":"https://orcid.org/0000-0002-3148-8374","contributorId":213645,"corporation":false,"usgs":true,"family":"Cress","given":"Jill Janene","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":954317,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Butler, Kevin","contributorId":358586,"corporation":false,"usgs":false,"family":"Butler","given":"Kevin","affiliations":[{"id":38832,"text":"Esri","active":true,"usgs":false}],"preferred":false,"id":954318,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Van Graafeiland, Keith","contributorId":200271,"corporation":false,"usgs":false,"family":"Van Graafeiland","given":"Keith","email":"","affiliations":[{"id":18946,"text":"Environmental Systems Research Institute, Inc. (ESRI), Redlands, CA","active":true,"usgs":false}],"preferred":false,"id":954319,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Karagulle, Deniz","contributorId":365441,"corporation":false,"usgs":false,"family":"Karagulle","given":"Deniz","affiliations":[{"id":38832,"text":"Esri","active":true,"usgs":false}],"preferred":false,"id":954320,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Frye, Charlie","contributorId":267718,"corporation":false,"usgs":false,"family":"Frye","given":"Charlie","affiliations":[{"id":38832,"text":"Esri","active":true,"usgs":false}],"preferred":false,"id":954321,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Breyer, Sean","contributorId":213678,"corporation":false,"usgs":false,"family":"Breyer","given":"Sean","affiliations":[{"id":38832,"text":"Esri","active":true,"usgs":false}],"preferred":false,"id":954322,"contributorType":{"id":1,"text":"Authors"},"rank":10},{"text":"Wright, Dawn","contributorId":267717,"corporation":false,"usgs":false,"family":"Wright","given":"Dawn","affiliations":[{"id":38832,"text":"Esri","active":true,"usgs":false}],"preferred":false,"id":954323,"contributorType":{"id":1,"text":"Authors"},"rank":11},{"text":"Klavitter, John","contributorId":196052,"corporation":false,"usgs":false,"family":"Klavitter","given":"John","affiliations":[{"id":6927,"text":"USFWS, National Wildlife Refuge System","active":true,"usgs":false}],"preferred":false,"id":954324,"contributorType":{"id":1,"text":"Authors"},"rank":12},{"text":"Spatz, Dena","contributorId":261708,"corporation":false,"usgs":false,"family":"Spatz","given":"Dena","affiliations":[{"id":17933,"text":"Pacific Rim Conservation","active":true,"usgs":false}],"preferred":false,"id":954325,"contributorType":{"id":1,"text":"Authors"},"rank":13},{"text":"Will, David","contributorId":365447,"corporation":false,"usgs":false,"family":"Will","given":"David","affiliations":[{"id":81757,"text":"Island Conservation","active":true,"usgs":false}],"preferred":false,"id":954326,"contributorType":{"id":1,"text":"Authors"},"rank":14},{"text":"Howald, Gregg","contributorId":289411,"corporation":false,"usgs":false,"family":"Howald","given":"Gregg","email":"","affiliations":[{"id":62133,"text":"Advanced Conservation Strategies, Williamsburg, VA, USA","active":true,"usgs":false}],"preferred":false,"id":954327,"contributorType":{"id":1,"text":"Authors"},"rank":15},{"text":"Wegmann, Alex","contributorId":299151,"corporation":false,"usgs":false,"family":"Wegmann","given":"Alex","affiliations":[{"id":7041,"text":"The Nature Conservancy","active":true,"usgs":false}],"preferred":false,"id":954328,"contributorType":{"id":1,"text":"Authors"},"rank":16},{"text":"Stanley, Charlotte K. 0000-0002-5019-4427","orcid":"https://orcid.org/0000-0002-5019-4427","contributorId":358047,"corporation":false,"usgs":false,"family":"Stanley","given":"Charlotte K.","affiliations":[{"id":85576,"text":"The Nature Conservancy, San Francisco, California","active":true,"usgs":false}],"preferred":false,"id":954329,"contributorType":{"id":1,"text":"Authors"},"rank":17},{"text":"Holmes, Nick","contributorId":365451,"corporation":false,"usgs":false,"family":"Holmes","given":"Nick","affiliations":[{"id":87140,"text":"Tha Nature Conservancy","active":true,"usgs":false}],"preferred":false,"id":954330,"contributorType":{"id":1,"text":"Authors"},"rank":18}]}} ,{"id":70274201,"text":"70274201 - 2026 - Widespread abyssal turbidites record megathrust earthquake-triggered landslides and coseismic deformation in the Cascadia subduction zone","interactions":[],"lastModifiedDate":"2026-03-10T14:22:25.780598","indexId":"70274201","displayToPublicDate":"2026-01-14T09:14:36","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":5010,"text":"Science Advances","active":true,"publicationSubtype":{"id":10}},"title":"Widespread abyssal turbidites record megathrust earthquake-triggered landslides and coseismic deformation in the Cascadia subduction zone","docAbstract":"Abyssal marine turbidites provide some of the longest and most spatially extensive records of subduction zone earthquake recurrence globally; however, correlation of these deposits over long distances and interpretation of synchronous emplacement requires both an understanding of the turbidite generating systems and precise dating. Here, we present an integrated suite of high-resolution bathymetry, subbottom profiles, and sediment cores from combined autonomous underwater vehicle, remotely operated vehicle, and ship-based studies at a key paleoseismic site in the southern Cascadia subduction zone. We demonstrate how widespread, earthquake-triggered landslides on the lower slope deposit discrete, proximal mass transport deposits (MTDs) that grade offshore into complex, interfingered abyssal turbidites, which correspond to records of megathrust earthquake history. We propose accretion and oversteepening of thrust folds on the lower slope both preconditions the slope to fail and provides a perpetual source of unstable material to fail during every earthquake cycle. Furthermore, we suggest the periodic and pervasive landsliding indicates coseismic deformation of the outer accretionary wedge during megathrust rupture.
","language":"English","publisher":"AAAS","doi":"10.1126/sciadv.adx6028","usgsCitation":"Hill, J.C., Watt, J., Paull, C.K., Caress, D., Brothers, D., Arizmendi, K., Gwiazda, R., Kluesner, J., Lundsten, E.M., Nieminski, N.M., Padgett, J.S., Paduan, J.B., and Snyder, G.R., 2026, Widespread abyssal turbidites record megathrust earthquake-triggered landslides and coseismic deformation in the Cascadia subduction zone: Science Advances, v. 12, no. 3, eadx6028, 18 p., https://doi.org/10.1126/sciadv.adx6028.","productDescription":"eadx6028, 18 p.","ipdsId":"IP-177326","costCenters":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":501096,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1126/sciadv.adx6028","text":"Publisher Index Page"},{"id":500958,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California, Oregon","otherGeospatial":"Cascadia subduction zone","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -125.25,\n 43\n ],\n [\n -125.25,\n 40.5\n ],\n [\n -124,\n 40.5\n ],\n [\n -124,\n 43\n ],\n [\n -125.25,\n 43\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"12","issue":"3","noUsgsAuthors":false,"publicationDate":"2026-01-14","publicationStatus":"PW","contributors":{"authors":[{"text":"Hill, Jenna C. 0000-0002-7475-357X","orcid":"https://orcid.org/0000-0002-7475-357X","contributorId":21987,"corporation":false,"usgs":true,"family":"Hill","given":"Jenna","email":"","middleInitial":"C.","affiliations":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":956922,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Watt, Janet 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We conducted a field investigation of the influence of hydrodynamic forcing, sediment properties, and benthic infauna on erodibility in the muddy shallows of San Pablo and Grizzly Bays in northern San Francisco Bay in summer 2019 and winter 2020. An erosion rate parameter Mc was determined from regressions between near-bed vertical turbulent sediment flux, as a proxy for erosion, and bed shear stress due to currents. During each 2-month study period, we measured benthic infauna abundance and dry bulk density, particle size distribution, percent organic carbon, chlorophyll a, pheophytin a, and carbohydrates carbon concentrations of surficial bed sediments five or six times. Mc increased with bed shear stress due to waves in both embayments. In San Pablo Bay, erodibility was approximately 50% lower during the winter than the summer deployment, whereas in Grizzly Bay, there was no significant difference. The factor most strongly related to the decrease in Mc in San Pablo Bay was increased abundance of the amphipod Ampelisca abdita. The observed reduction in erodibility may occur in many muddy estuaries because A. abdita is broadly distributed in the coastal waters of North America. Erodibility was also directly related to biomass of the invasive clam Potamocorbula amurensis. Erodibility did not depend on dry bulk density: bulk density did not vary seasonally in San Pablo Bay and was lower in winter than summer in Grizzly Bay.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2025JG008950","usgsCitation":"Lacy, J.R., McGill, S., Thompson, J., Allen, R., Parchaso, F., Hart, D., WinklerPrins, L.T., Fackrell, J.K., and Stevens, A.W., 2026, Biophysical controls on sediment erodibility in shallow estuarine embayments: JGR Biogeosciences, v. 131, no. 1, e2025JG008950, 21 p., https://doi.org/10.1029/2025JG008950.","productDescription":"e2025JG008950, 21 p.","ipdsId":"IP-176847","costCenters":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":498908,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2025jg008950","text":"Publisher Index Page"},{"id":498648,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","otherGeospatial":"Grizzly Bay, San Pablo Bay","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -122.55721447677519,\n 38.20084657985487\n ],\n [\n -122.55721447677519,\n 37.97556183117294\n ],\n [\n -121.92713639875167,\n 37.97556183117294\n ],\n [\n -121.92713639875167,\n 38.20084657985487\n ],\n [\n -122.55721447677519,\n 38.20084657985487\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"131","issue":"1","noUsgsAuthors":false,"publicationDate":"2026-01-14","publicationStatus":"PW","contributors":{"authors":[{"text":"Lacy, Jessica R. 0000-0002-2797-6172","orcid":"https://orcid.org/0000-0002-2797-6172","contributorId":201703,"corporation":false,"usgs":true,"family":"Lacy","given":"Jessica","email":"","middleInitial":"R.","affiliations":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":953844,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"McGill, Samantha C. 0000-0001-9320-8764","orcid":"https://orcid.org/0000-0001-9320-8764","contributorId":304095,"corporation":false,"usgs":true,"family":"McGill","given":"Samantha C.","affiliations":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":true,"id":953845,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Thompson, Janet 0000-0002-1528-8452","orcid":"https://orcid.org/0000-0002-1528-8452","contributorId":217718,"corporation":false,"usgs":true,"family":"Thompson","given":"Janet","affiliations":[{"id":37277,"text":"WMA - 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2026 - The contribution of a surge event to infilling in a barrier-enclosed estuary: Insights from field observations","interactions":[],"lastModifiedDate":"2026-01-26T15:46:30.900446","indexId":"70273711","displayToPublicDate":"2026-01-14T08:39:59","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1425,"text":"Earth Surface Processes and Landforms","active":true,"publicationSubtype":{"id":10}},"title":"The contribution of a surge event to infilling in a barrier-enclosed estuary: Insights from field observations","docAbstract":"Many estuaries worldwide face increasing sediment loading caused by catchment land use change and intensification, creating subsequent adverse effects on estuarine ecosystems. Extreme weather events can disproportionately alter sediment pathways and loading. Although storm-driven sediment exchange has been widely examined at open coasts and inlets, key transport mechanisms within constricted, sheltered estuaries remain understudied.
This study presents an observational dataset capturing the impact of a 99th percentile water-level event (based on 20 years of records) on sediment transport pathways in a sheltered, barrier-enclosed estuary. This event, driven by a 3-day storm surge (>0.5 m) combined with a spring tide, was recorded during a 3-week field campaign.
Sediment transport pathways and riverine contributions were analysed, and observations revealed substantial changes in suspended sediment concentrations increasing from 18 mg/l to 70 mg/l during the event. The elevated water levels and resulting pressure gradient at the constricted study site entrance caused by the storm surge increased local flood dominance. Combined with higher flow velocities and resuspension, the storm led to a sixfold increase in sediment import at the estuary entrance and a 600-fold increase in sediment flux to the upper estuary.
The decoupling of peak suspended sediment concentrations from streamflow indicates that the resuspension of estuarine legacy sediment, rather than catchment inputs, dominated the system's response.
These findings challenge assumptions about estuarine sediment budgets and emphasise that incorporating high water-level surge events into models can enhance the prediction of long-term estuarine evolution. Given projected increases in storm frequency under climate change, understanding these episodic but highly consequential sediment pulses can support the assessment of wetland resilience and inform estuarine management strategies.
","language":"English","publisher":"Wiley","doi":"10.1002/esp.70229","usgsCitation":"Vaassen, S.M., Bryan, K.R., Swales, A., Carr, J., and Pilditch, C.A., 2026, The contribution of a surge event to infilling in a barrier-enclosed estuary: Insights from field observations: Earth Surface Processes and Landforms, v. 51, no. 1, e70229, 15 p., https://doi.org/10.1002/esp.70229.","productDescription":"e70229, 15 p.","ipdsId":"IP-176448","costCenters":[{"id":50464,"text":"Eastern Ecological Science Center","active":true,"usgs":true}],"links":[{"id":499337,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1002/esp.70229","text":"Publisher Index Page"},{"id":499020,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"New Zealand","otherGeospatial":"Whangateau Estuary","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n 174.32168403285908,\n -36.289067166278265\n ],\n [\n 174.32168403285908,\n -37.15272692595895\n ],\n [\n 175.7634562180076,\n -37.15272692595895\n ],\n [\n 175.7634562180076,\n -36.289067166278265\n ],\n [\n 174.32168403285908,\n -36.289067166278265\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"51","issue":"1","noUsgsAuthors":false,"publicationDate":"2026-01-14","publicationStatus":"PW","contributors":{"authors":[{"text":"Vaassen, Sanne M.","contributorId":365581,"corporation":false,"usgs":false,"family":"Vaassen","given":"Sanne","middleInitial":"M.","affiliations":[{"id":38833,"text":"University of Auckland","active":true,"usgs":false}],"preferred":false,"id":954395,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bryan, Karin R.","contributorId":229417,"corporation":false,"usgs":false,"family":"Bryan","given":"Karin","middleInitial":"R.","affiliations":[{"id":12678,"text":"University of Waikato","active":true,"usgs":false}],"preferred":false,"id":954396,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Swales, Andrew","contributorId":149632,"corporation":false,"usgs":false,"family":"Swales","given":"Andrew","email":"","affiliations":[],"preferred":false,"id":954397,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Carr, Joel 0000-0002-9164-4156 jcarr@usgs.gov","orcid":"https://orcid.org/0000-0002-9164-4156","contributorId":220098,"corporation":false,"usgs":true,"family":"Carr","given":"Joel","email":"jcarr@usgs.gov","affiliations":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true}],"preferred":true,"id":954398,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Pilditch, Conrad A.","contributorId":365584,"corporation":false,"usgs":false,"family":"Pilditch","given":"Conrad","middleInitial":"A.","affiliations":[{"id":26898,"text":"University of Auckland, New Zealand","active":true,"usgs":false}],"preferred":false,"id":954399,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70273660,"text":"70273660 - 2026 - Unveiling a legacy of fish introductions to mountain lakes using historical records and eDNA surveys in a National Park","interactions":[],"lastModifiedDate":"2026-01-22T14:52:45.506643","indexId":"70273660","displayToPublicDate":"2026-01-14T07:45:13","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":9319,"text":"Frontiers in Conservation Science","active":true,"publicationSubtype":{"id":10}},"title":"Unveiling a legacy of fish introductions to mountain lakes using historical records and eDNA surveys in a National Park","docAbstract":"Across the western United States, introductions of non-native fish into historically fishless mountain lakes have impacted native biota. Understanding the impacts of fish introductions is essential for conservation in Olympic National Park, a Biosphere Reserve. We reconstructed fish plantings using records dating back to 1930, followed by environmental DNA (eDNA) surveys to estimate the current distribution of fish and amphibians in 117 remote mountain lakes. We used Bayesian multiscale occupancy models to determine how lake attributes and planting history related to fish and amphibian occupancy. The most frequently detected species were Brook Trout, Rainbow Trout, Cascades Frog, and Northwestern Salamander. eDNA sampling revealed 52 lakes with amphibians only, 45 with fish and amphibians, 14 with fish only, and 6 unoccupied. Of the 53 lakes with planting records, 38 had fish eDNA detected. Fish eDNA was also detected in 21 lakes lacking planting records, which could reflect incomplete records, unauthorized plantings, and false positive detections. Of the three species planted, Cutthroat Trout had the highest failure rate and did not become established in 23 of 28 historically planted lakes. In a subset of 9 lakes sampled for up to 7 years, those with known fish and amphibian presence showed consistent eDNA detections over time. The number of times a lake was stocked was the best predictor of occupancy for Brook and Rainbow trout, while higher occupancy for Brook Trout was also associated with lower elevations, lower solar radiation, and larger lake area. We did not observe widespread negative associations between amphibian occupancy and fish presence, although there was a negative relationship between fish presence and Rough-skinned Newt and Long-toed Salamander occupancy. Cascades Frog occupancy showed no relationship to fish presence or lake traits. Our results suggest mechanisms of fish persistence over time and highlight areas where native amphibians are impacted by introduced fish. These results can guide management options like targeted fish removals that benefit native fauna while still supporting recreational fishing. More broadly, our work demonstrates the value of combining historical records with contemporary surveys and the utility of eDNA for broad-scale surveys of species distribution in remote wilderness areas.
","language":"English","publisher":"Frontiers Media","doi":"10.3389/fcosc.2025.1698619","usgsCitation":"Brenkman, S.J., Duda, J.J., McCaffery, R.M., Kierczynski, K.E., Hoy, M.S., Kumec, T.J., Baccus, ., Goldberg, C.S., Ostberg, C.O., and Fradkin, S.C., 2026, Unveiling a legacy of fish introductions to mountain lakes using historical records and eDNA surveys in a National Park: Frontiers in Conservation Science, v. 6, 1698619, 17 p., https://doi.org/10.3389/fcosc.2025.1698619.","productDescription":"1698619, 17 p.","ipdsId":"IP-182809","costCenters":[{"id":654,"text":"Western Fisheries Research Center","active":true,"usgs":true}],"links":[{"id":498932,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.3389/fcosc.2025.1698619","text":"Publisher Index Page"},{"id":498830,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Washington","otherGeospatial":"Olympic 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Olympic National Park","active":true,"usgs":false}],"preferred":false,"id":954213,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Hoy, Marshal S. 0000-0003-2828-9697","orcid":"https://orcid.org/0000-0003-2828-9697","contributorId":220730,"corporation":false,"usgs":true,"family":"Hoy","given":"Marshal","middleInitial":"S.","affiliations":[{"id":654,"text":"Western Fisheries Research Center","active":true,"usgs":true}],"preferred":true,"id":954214,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Kumec, Trevor J.","contributorId":365362,"corporation":false,"usgs":false,"family":"Kumec","given":"Trevor","middleInitial":"J.","affiliations":[{"id":56191,"text":"Resource Environmental Solutions","active":true,"usgs":false}],"preferred":false,"id":954215,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Baccus, William","contributorId":365363,"corporation":false,"usgs":false,"family":"Baccus","given":" William","affiliations":[{"id":87130,"text":"U.S. National Park Service, Olympic National Park","active":true,"usgs":false}],"preferred":false,"id":954216,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Goldberg, Caren Suzanne 0000-0002-0863-9939","orcid":"https://orcid.org/0000-0002-0863-9939","contributorId":365364,"corporation":false,"usgs":true,"family":"Goldberg","given":"Caren","middleInitial":"Suzanne","affiliations":[{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"preferred":true,"id":954217,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Ostberg, Carl O. 0000-0003-1479-8458","orcid":"https://orcid.org/0000-0003-1479-8458","contributorId":220731,"corporation":false,"usgs":true,"family":"Ostberg","given":"Carl","middleInitial":"O.","affiliations":[{"id":654,"text":"Western Fisheries Research Center","active":true,"usgs":true}],"preferred":true,"id":954218,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Fradkin, Steven C.","contributorId":365369,"corporation":false,"usgs":false,"family":"Fradkin","given":"Steven","middleInitial":"C.","affiliations":[{"id":87130,"text":"U.S. National Park Service, Olympic National Park","active":true,"usgs":false}],"preferred":false,"id":954219,"contributorType":{"id":1,"text":"Authors"},"rank":10}]}} ,{"id":70273482,"text":"70273482 - 2026 - The magmatic-hydrothermal system of the Three Sisters volcanic cluster, Oregon, imaged from field gravity measurements","interactions":[],"lastModifiedDate":"2026-01-20T15:27:14.596406","indexId":"70273482","displayToPublicDate":"2026-01-14T07:40:17","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":7501,"text":"JGR Solid Earth","active":true,"publicationSubtype":{"id":10}},"title":"The magmatic-hydrothermal system of the Three Sisters volcanic cluster, Oregon, imaged from field gravity measurements","docAbstract":"From 2019 to 2024, gravity surveys were conducted at the Three Sisters volcanic cluster (TSVC), measuring 246 gravity sites using a spring relative gravimeter. We calculated the residual Bouguer anomaly and identified three main zones with negative anomalies, ranging from −4 to −8 mGal, located southwest and west of South Sister, within an area that has been uplifting for the past two decades. After inversion, we obtain a 3D density model of the subsurface and identify low-density bodies extending from the surface down to 3 km. We estimate a total of 15 km3 of crustal bodies with density close to 2 g/cm3 that could store up to ~5 km3 of water, forming an extensive hydrothermal system beneath the TSVC. We explore the possible combinations of melt compositions and temperatures that could create a bulk density close to our reference crustal density (2.5 g/cm3) using MELTS thermodynamic simulations. Our results indicate that a magmatic mush with as little as 15% partial melt of bulk rhyolitic composition or as much as 52%–57% partial melt of a bulk dacitic composition could be stored in a magmatic system under TSVC without generating a detectable gravity anomaly. Episodic magma injections at the base of the magmatic system, such as the 1998–2000 intrusion at ~6 km depth, would bring heat and gas to the hydrothermal system while maintaining a low melt fraction in the magmatic mush, as imaged at other Cascade volcanoes.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2025JB031886","usgsCitation":"Le Mevel, H., Andersen, N.L., Dechert, A.E., and Dufek, J., 2026, The magmatic-hydrothermal system of the Three Sisters volcanic cluster, Oregon, imaged from field gravity measurements: JGR Solid Earth, v. 131, no. 1, e2025JB031886, 16 p., https://doi.org/10.1029/2025JB031886.","productDescription":"e2025JB031886, 16 p.","ipdsId":"IP-178279","costCenters":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"links":[{"id":498736,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Oregon","otherGeospatial":"Three Sisters volcanic cluster","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -121.85498844236317,\n 44.16602505212751\n ],\n [\n -121.85498844236317,\n 44.00814911568179\n ],\n [\n -121.67001872468549,\n 44.00814911568179\n ],\n [\n -121.67001872468549,\n 44.16602505212751\n ],\n [\n -121.85498844236317,\n 44.16602505212751\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"131","issue":"1","noUsgsAuthors":false,"publicationDate":"2026-01-14","publicationStatus":"PW","contributors":{"authors":[{"text":"Le Mevel, Helene","contributorId":345674,"corporation":false,"usgs":false,"family":"Le Mevel","given":"Helene","affiliations":[{"id":82691,"text":"Carnegie Institution for Science, Washington, DC","active":true,"usgs":false}],"preferred":false,"id":953897,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Andersen, Nathan Lee 0000-0002-4152-4914","orcid":"https://orcid.org/0000-0002-4152-4914","contributorId":345693,"corporation":false,"usgs":true,"family":"Andersen","given":"Nathan","email":"","middleInitial":"Lee","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":953898,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Dechert, Annika E.","contributorId":365193,"corporation":false,"usgs":false,"family":"Dechert","given":"Annika","middleInitial":"E.","affiliations":[{"id":6604,"text":"University of Oregon","active":true,"usgs":false}],"preferred":false,"id":953899,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Dufek, Josef","contributorId":365194,"corporation":false,"usgs":false,"family":"Dufek","given":"Josef","affiliations":[{"id":6604,"text":"University of Oregon","active":true,"usgs":false}],"preferred":false,"id":953900,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70273737,"text":"70273737 - 2026 - Bird predation obscures detection of acoustic telemetry tags in fish","interactions":[],"lastModifiedDate":"2026-01-28T14:12:36.171101","indexId":"70273737","displayToPublicDate":"2026-01-13T10:58:23","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":773,"text":"Animal Biotelemetry","active":true,"publicationSubtype":{"id":10}},"title":"Bird predation obscures detection of acoustic telemetry tags in fish","docAbstract":"Increasing application of acoustic telemetry for determining survival, migration and habitat use of fishes highlights the need to improve interpretation of tracks that end abruptly: when is fishing mortality, predation, or some other cause to be inferred? Significant technological advances have led to the development of tags that “sense” predation and can be used to infer information about the type of predator that consumed the tagged fish. However, growing evidence suggests that bird predation is not effectively quantified by the technology. We hypothesized that reduction in sound transmission from acoustic tags in the gut of a bird combined with short bird diving intervals would eliminate detections of acoustic telemetry tags from the surface and severely reduce detection efficiency at depth. We test this hypothesis indirectly with two experiments using cormorant carcasses containing tagged fish in which carcasses were either tethered to a mooring for several hours or lowered through the water to simulate diving behavior. Detection of tagged prey fish in the gut of bird carcasses was severely reduced or negated completely, supporting our hypothesis. By comparison, as expected, tagged fish that were not in the gut of bird carcasses were detected at a higher frequency. Depth and distance to passive moored receivers also affected detection probability of tagged fish with more detections at depth and when closer to the receiver. Our results emphasized the importance of accounting for avian predation of tagged fish in studies of prey species in surface waters. Further, while recent development of predation sensing tags has illustrated a few examples of bird predation, our results demonstrate that determining that a tagged fish has been consumed by a diving bird will be difficult and will likely require alternative methods or technologies.
","language":"English","publisher":"Springer","doi":"10.1186/s40317-025-00441-1","usgsCitation":"Kraus, R., Roberts, J., Dufour, M.R., and Branden E. Kohler, 2026, Bird predation obscures detection of acoustic telemetry tags in fish: Animal Biotelemetry, v. 14, 2, 9 p., https://doi.org/10.1186/s40317-025-00441-1.","productDescription":"2, 9 p.","ipdsId":"IP-177144","costCenters":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"links":[{"id":499319,"rank":2,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1186/s40317-025-00441-1","text":"Publisher Index Page"},{"id":499098,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"14","noUsgsAuthors":false,"publicationDate":"2026-01-13","publicationStatus":"PW","contributors":{"authors":[{"text":"Kraus, Richard 0000-0003-4494-1841","orcid":"https://orcid.org/0000-0003-4494-1841","contributorId":216548,"corporation":false,"usgs":true,"family":"Kraus","given":"Richard","affiliations":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"preferred":true,"id":954487,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Roberts, James 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","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":954488,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Dufour, Mark Richard 0000-0001-6930-7666","orcid":"https://orcid.org/0000-0001-6930-7666","contributorId":291450,"corporation":false,"usgs":true,"family":"Dufour","given":"Mark","email":"","middleInitial":"Richard","affiliations":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"preferred":true,"id":954489,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Branden E. Kohler","contributorId":365630,"corporation":false,"usgs":false,"family":"Branden E. Kohler","affiliations":[{"id":6601,"text":"Michigan State University","active":true,"usgs":false}],"preferred":false,"id":954490,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70273656,"text":"70273656 - 2026 - Plasticity in the reproductive biology of Yellowstone cutthroat trout Oncorhynchus virginalis bouvieri in Yellowstone Lake following lake trout Salvelinus namaycush invasion","interactions":[],"lastModifiedDate":"2026-01-22T15:47:50.9445","indexId":"70273656","displayToPublicDate":"2026-01-13T09:43:23","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2285,"text":"Journal of Fish Biology","active":true,"publicationSubtype":{"id":10}},"title":"Plasticity in the reproductive biology of Yellowstone cutthroat trout Oncorhynchus virginalis bouvieri in Yellowstone Lake following lake trout Salvelinus namaycush invasion","docAbstract":"Yellowstone cutthroat trout Oncorhynchus virginalis bouvieri in Yellowstone Lake are the focus of intensive conservation efforts due to the threat of predation by invasive lake trout Salvelinus namaycush. Suppression gillnetting has reduced the abundance of predatory lake trout, and the Yellowstone cutthroat trout population is recovering. Long-term monitoring indicates the size structure of the population shifted following lake trout invasion, suggesting that reproductive demographic rates of Yellowstone cutthroat trout may have changed. Length at 50% probability of maturity, as assessed using histological analysis of gonadal tissue, was 479 mm (95% confidence interval [CI] 467–490 mm) for females and 406 mm (95% CI 386–430 mm) for males, compared to 330 mm for males and females historically. Currently, age at 50% probability of maturity is 6.6 for females and 5.4 for males. The rate of skipped spawning was 3% for females and 38% for males. Mean absolute fecundity was 2897 ovarian follicles/individual at present compared to 1141 ovarian follicles/individual before lake trout invasion. Mean relative fecundity was 2157 ovarian follicles/kg. This research illustrates the plasticity in the reproductive strategies of fishes as a result of an invasive species. Understanding the reproductive biology of fish populations is vital for effective fisheries management, and these results are integral to a population model that can be used to develop new conservation benchmarks for Yellowstone cutthroat trout.
","language":"English","publisher":"Wiley","doi":"10.1111/jfb.70281","collaboration":"National Park Service","usgsCitation":"Briggs, M.A., Webb, M.A., Guy, C.S., and Koel, T.M., 2026, Plasticity in the reproductive biology of Yellowstone cutthroat trout Oncorhynchus virginalis bouvieri in Yellowstone Lake following lake trout Salvelinus namaycush invasion: Journal of Fish Biology, https://doi.org/10.1111/jfb.70281.","ipdsId":"IP-179605","costCenters":[{"id":200,"text":"Coop Res Unit Seattle","active":true,"usgs":true}],"links":[{"id":498938,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1111/jfb.70281","text":"Publisher Index Page"},{"id":498841,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Wyoming","otherGeospatial":"Yellowstone Lake","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -110.60702393614453,\n 44.5900031594889\n ],\n [\n -110.60702393614453,\n 44.26482350324392\n ],\n [\n -110.15041501501246,\n 44.26482350324392\n ],\n [\n -110.15041501501246,\n 44.5900031594889\n ],\n [\n -110.60702393614453,\n 44.5900031594889\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","edition":"Online First","noUsgsAuthors":false,"publicationDate":"2026-01-13","publicationStatus":"PW","contributors":{"authors":[{"text":"Briggs, Michelle A.","contributorId":365353,"corporation":false,"usgs":false,"family":"Briggs","given":"Michelle","middleInitial":"A.","affiliations":[{"id":36555,"text":"Montana State University","active":true,"usgs":false}],"preferred":false,"id":954197,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Webb, Molly A.","contributorId":365354,"corporation":false,"usgs":false,"family":"Webb","given":"Molly","middleInitial":"A.","affiliations":[{"id":36188,"text":"U.S. Fish and Wildlife Service","active":true,"usgs":false}],"preferred":false,"id":954198,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Guy, Christopher S. 0000-0002-9936-4781 cguy@usgs.gov","orcid":"https://orcid.org/0000-0002-9936-4781","contributorId":2876,"corporation":false,"usgs":true,"family":"Guy","given":"Christopher","email":"cguy@usgs.gov","middleInitial":"S.","affiliations":[{"id":200,"text":"Coop Res Unit Seattle","active":true,"usgs":true},{"id":5062,"text":"Office of the Chief Scientist for Ecosystems","active":true,"usgs":true},{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":954199,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Koel, Todd M.","contributorId":365355,"corporation":false,"usgs":false,"family":"Koel","given":"Todd","middleInitial":"M.","affiliations":[{"id":36976,"text":"U.S. National Park Service","active":true,"usgs":false}],"preferred":false,"id":954200,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70273487,"text":"70273487 - 2026 - Annual grass invasion is transforming the sagebrush biome’s songbird communities","interactions":[],"lastModifiedDate":"2026-03-11T16:45:32.310709","indexId":"70273487","displayToPublicDate":"2026-01-13T09:08:54","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1701,"text":"Frontiers in Ecology and the Environment","active":true,"publicationSubtype":{"id":10}},"title":"Annual grass invasion is transforming the sagebrush biome’s songbird communities","docAbstract":"Novel stressors like climate change and biological invasions alter ecological communities, resulting in changes to ecosystem services and biodiversity (that is, ecological transformation). Most ecological transformation research focuses on plants, but animals are likely affected by and plausibly mediate the extent, impact, and pace of transformations. In western North America, where invasive annual grasses are transforming sagebrush-steppe ecosystems, we quantified how transformation in vegetation drives songbird community change. We hypothesized that transformation of vegetation communities via invasion alters wildlife communities by favoring generalists over specialists, albeit with extinction debts that may temporarily obscure transformations’ consequences. Although local-scale songbird diversity increased with grass invasion, we found that this shift was accompanied by ongoing reorganization of songbird communities at larger scales (across the sagebrush biome), driven by heterogeneous impacts of invasion among species and guilds. Through our biome-wide analysis, we were also able to identify high-priority regions for conservation of sensitive songbird species. Our research provides evidence that wildlife communities are transforming alongside vegetation communities and offers insight into the approaches required to quantify nascent community turnover.
","language":"English","publisher":"Ecological Society of America","doi":"10.1002/fee.70024","usgsCitation":"Hobart, B.K., Moss, W.E., Cook, M.C., Nagy, R.C., and McKenzie, V.J., 2026, Annual grass invasion is transforming the sagebrush biome’s songbird communities: Frontiers in Ecology and the Environment, e70024, 8 p., https://doi.org/10.1002/fee.70024.","productDescription":"e70024, 8 p.","ipdsId":"IP-167644","costCenters":[{"id":481,"text":"Northern Rocky Mountain Science Center","active":true,"usgs":true}],"links":[{"id":500971,"rank":5,"type":{"id":34,"text":"Image Folder"},"url":"https://pubs.usgs.gov/ja/70273487/images"},{"id":498923,"rank":4,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1002/fee.70024","text":"Publisher Index Page"},{"id":498783,"rank":2,"type":{"id":31,"text":"Publication XML"},"url":"https://pubs.usgs.gov/ja/70273487/70273487.XML"},{"id":498784,"rank":3,"type":{"id":42,"text":"Open Access USGS Document"},"url":"https://pubs.usgs.gov/publication/70273487/full"},{"id":498780,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"western United States","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -121.21700235279832,\n 49.461365022778125\n ],\n [\n -121.21700235279832,\n 36.16184720583651\n ],\n [\n -100.67035958615037,\n 36.16184720583651\n ],\n [\n -100.67035958615037,\n 49.461365022778125\n ],\n [\n -121.21700235279832,\n 49.461365022778125\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","edition":"Online First","noUsgsAuthors":false,"publicationDate":"2026-01-13","publicationStatus":"PW","contributors":{"authors":[{"text":"Hobart, Brendan K.","contributorId":338335,"corporation":false,"usgs":false,"family":"Hobart","given":"Brendan","middleInitial":"K.","affiliations":[{"id":36621,"text":"University of Colorado","active":true,"usgs":false}],"preferred":false,"id":953910,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Moss, Wynne Emily 0000-0002-2813-1710","orcid":"https://orcid.org/0000-0002-2813-1710","contributorId":338331,"corporation":false,"usgs":true,"family":"Moss","given":"Wynne","email":"","middleInitial":"Emily","affiliations":[{"id":481,"text":"Northern Rocky Mountain Science Center","active":true,"usgs":true}],"preferred":true,"id":953911,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Cook, Max C","contributorId":365201,"corporation":false,"usgs":false,"family":"Cook","given":"Max","middleInitial":"C","affiliations":[{"id":36621,"text":"University of Colorado","active":true,"usgs":false}],"preferred":false,"id":953912,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Nagy, R. Chelsea","contributorId":365202,"corporation":false,"usgs":false,"family":"Nagy","given":"R.","middleInitial":"Chelsea","affiliations":[{"id":36621,"text":"University of Colorado","active":true,"usgs":false}],"preferred":false,"id":953913,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"McKenzie, Valerie J","contributorId":365203,"corporation":false,"usgs":false,"family":"McKenzie","given":"Valerie","middleInitial":"J","affiliations":[{"id":36621,"text":"University of Colorado","active":true,"usgs":false}],"preferred":false,"id":953914,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70273496,"text":"70273496 - 2026 - Identifying headwater streams across the conterminous United States","interactions":[],"lastModifiedDate":"2026-01-22T16:52:21.390954","indexId":"70273496","displayToPublicDate":"2026-01-13T08:44:42","publicationYear":"2026","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1478,"text":"Ecosystems","active":true,"publicationSubtype":{"id":10}},"title":"Identifying headwater streams across the conterminous United States","docAbstract":"Headwater streams play critical roles in hydrologic and biogeochemical processes and functions, yet their spatial distribution and land cover context remain poorly understood at continental scales, and no dedicated geospatial dataset exists. Building from a high-resolution conterminous United States (CONUS) hydrography network dataset, we quantified the spatial extent, density, and upstream catchment characteristics of headwater stream segments across the CONUS. We identified approximately 8.4 million kilometers of headwater streams, finding that 77% of the total stream network consists of headwaters, nearly double the total length represented in prior estimates. Stream density varied fivefold across regions, from < 1 km·km−2 in arid basins to > 5 km·km−2 in humid, forested areas. Over 73% of the CONUS landmass drains from headwater streams. The majority of headwater stream length occurred in forested and cultivated catchments across the CONUS, while substantial regional differences were evident for headwater stream distribution in other land cover classes (for example, wetlands, urban areas, shrublands, and herbaceous-dominated catchments). The dedicated and novel geospatial dataset, HELiOS (HEadwater streams and Low-Order Systems) is introduced for management and research use. The HELiOS dataset provides the first continental-scale, high-resolution characterization of headwater streams, offering new insights and opportunities for hydrologic modeling, ecological assessments, and environmental policy.
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Current knowledge gaps hinder recovery planning but are challenging to redress through direct observation of rare interactions in the field.
We used genetic metabarcoding to characterize the taxonomic composition of pollen collected by B. affinis workers in the Appalachian mountains of Virginia and West Virginia from 2021–2023. We developed a custom sequence database of the regional flora and compared results for two independent genetic loci, internal transcribed spacer 1 and internal transcribed spacer 2 (ITS1 and ITS2).
While ITS2 consistently detected more plant diversity, results from the two loci were broadly concordant with a few notable exceptions. The plant genera Hydrangea, Actaea, Rhododendron, Tilia, and (unexpectedly) Laportea were prominent in midsummer samples, with Rubus a consistent contributor in late spring and early summer. Pea flowers (family Fabaceae) were relatively infrequent but the genera Securigera and Trifolium were detected before the Hydrangea bloom and again in late summer afterwards. The diversity of forage plants was highest in late summer, driven primarily by various genera of Asteraceae. Comparing the current data with previous work indicates regional differentiation in forage plants between Appalachia and the upper Midwest, but also allows ‘consensus’ forage sources that are supported by multiple lines of evidence and shared between regions to be tabulated. These results should help managers focus survey efforts for this endangered species and plan habitat enhancements.
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freshwater bathymetry","docAbstract":"We provide an overview of an uncrewed aircraft system (UAS)-based software-defined radar (SDRadar) system for high-resolution geophysical observations. The radar transceiver is implemented on a Radio Frequency System-on-Chip (RFSoC) platform, along with an ultra-wideband Vivaldi antenna that has a starting operating frequency of 150 MHz, enabling the system to be used across different applications, including measurements of freshwater bathymetry. In addition to system design and subsystem performance assessments, this paper presents the results of field testing conducted along the Sacramento River near Glenn, California, USA. The radar-derived river depth measurements are compared with ground truth data collected from a crewed boat using an acoustic Doppler current profiler (ADCP). The results show good agreement, with a root mean square error (RMSE) of 0.079 m.
","language":"English","publisher":"IEEE Xplore","doi":"10.1109/TAP.2025.3642394","usgsCitation":"Eskandari, S., Melebari, A., Kinzel, P.J., Lotspeich, R.R., Eggleston, J., and Moghaddam, M., 2026, Development and field testing of a UAS-based-software-defined radar for measuring freshwater bathymetry: IEEE Transactions on Antennas and Propagation, 12 p., https://doi.org/10.1109/TAP.2025.3642394.","productDescription":"12 p.","ipdsId":"IP-175859","costCenters":[{"id":37786,"text":"WMA - Observing Systems Division","active":true,"usgs":true}],"links":[{"id":498712,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1109/tap.2025.3642394","text":"Publisher Index Page"},{"id":498805,"rank":1,"type":{"id":30,"text":"Data Release"},"url":"https://doi.org/10.5066/P1QQEJV7","text":"USGS data release","linkHelpText":"In situ measurements of water depth collected with acoustic Doppler current profilers and remotely sensed depths acquired with a software-defined radar deployed from an uncrewed aircraft system, Sacramento River, California, September 18-19, 2024"},{"id":498649,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","city":"Glenn","otherGeospatial":"Sacramento River","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -122.01693399490816,\n 39.56351114246104\n ],\n [\n -122.01693399490816,\n 39.407688010111286\n ],\n [\n -121.97927648853752,\n 39.407688010111286\n ],\n [\n -121.97927648853752,\n 39.56351114246104\n ],\n [\n -122.01693399490816,\n 39.56351114246104\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","edition":"Online First","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Eskandari, Sepehr 0000-0003-2831-6288","orcid":"https://orcid.org/0000-0003-2831-6288","contributorId":357310,"corporation":false,"usgs":false,"family":"Eskandari","given":"Sepehr","affiliations":[{"id":13249,"text":"University of Southern California","active":true,"usgs":false}],"preferred":false,"id":953837,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Melebari, Asem 0000-0001-6040-3977","orcid":"https://orcid.org/0000-0001-6040-3977","contributorId":357311,"corporation":false,"usgs":false,"family":"Melebari","given":"Asem","affiliations":[{"id":13249,"text":"University of Southern California","active":true,"usgs":false}],"preferred":false,"id":953838,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Kinzel, Paul J. 0000-0002-6076-9730 pjkinzel@usgs.gov","orcid":"https://orcid.org/0000-0002-6076-9730","contributorId":743,"corporation":false,"usgs":true,"family":"Kinzel","given":"Paul","email":"pjkinzel@usgs.gov","middleInitial":"J.","affiliations":[{"id":438,"text":"National Research Program - 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