The relative percentages of diatom taxa in 5 deep-sea cores (DSDP 266, ODP 699A, ODP 747A, ODP 751 A, and Eltanin Core 50-28) from the Southern Ocean are determined for an interval centered on 3.1 to 2.9 Ma in the middle part of the Pliocene. This climatically warm interval, which is being studied by the PRISM Project of the U.S. Geological Survey, coincides with a proposed interval of major deglaciation of East Antarctica. The maximum southerly position of the Antarctic Polar Front between 3.1 and 3.0 Ma is inferred from these diatom studies, the presence of calcareous nannofossils in the sediments, and sedimentologic and micropaleontologic information from the literature. It is suggested that the Antarctic Polar Front may have migrated by as much as 6 ° of latitude further to the south in the southeastern Atlantic and Indian Oceans during this Pliocene warm interval but probably lay close to its present day position in the southwest Atlantic and Drake Passage. Summer sea surface temperatures are inferred to have been no more than 3 °–4 °C warmer than present at latitudes between 55 ° and 60 °S.
","language":"English","publisher":"Elsevier","doi":"10.1016/0377-8398(95)00060-7","usgsCitation":"Barron, J.A., 1996, Diatom constraints on the position of the Antarctic Polar Front in the middle part of the Pliocene: Marine Micropaleontology, v. 27, no. 1-4, p. 195-213, https://doi.org/10.1016/0377-8398(95)00060-7.","productDescription":"19 p.","startPage":"195","endPage":"213","costCenters":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":228954,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"27","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a00aae4b0c8380cd4f84f","contributors":{"authors":[{"text":"Barron, John A.","contributorId":116559,"corporation":false,"usgs":true,"family":"Barron","given":"John","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":377725,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":34695,"text":"b2150C - 1996 - Magnetic and gravity study of the Paducah 1° x 2° CUSMAP quadrangle, Illinois, Indiana, Kentucky, and Missouri","interactions":[],"lastModifiedDate":"2021-10-05T12:03:02.747863","indexId":"b2150C","displayToPublicDate":"1996-04-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":306,"text":"Bulletin","code":"B","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"2150","chapter":"C","title":"Magnetic and gravity study of the Paducah 1° x 2° CUSMAP quadrangle, Illinois, Indiana, Kentucky, and Missouri","docAbstract":"No abstract available.
","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"The Paducah CUSMAP quadrangle: Resource and topical investigations","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/b2150C","usgsCitation":"Hildenbrand, T., Kucks, R., and Heigold, P.C., 1996, Magnetic and gravity study of the Paducah 1° x 2° CUSMAP quadrangle, Illinois, Indiana, Kentucky, and Missouri: U.S. Geological Survey Bulletin 2150, iii, 22 p., https://doi.org/10.3133/b2150C.","productDescription":"iii, 22 p.","costCenters":[],"links":[{"id":167538,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/bul/2150c/report-thumb.jpg"},{"id":62561,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/bul/2150c/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":390202,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_22414.htm"}],"country":"United States","state":"Illinois, Indiana, Kentucky, Missouri","otherGeospatial":"Paducah 1° x 2° CUSMAP quadrangle","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -90,\n 37\n ],\n [\n -88,\n 37\n ],\n [\n -88,\n 38\n ],\n [\n -90,\n 38\n ],\n [\n -90,\n 37\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a7fe4b07f02db64928e","contributors":{"authors":[{"text":"Hildenbrand, T.G.","contributorId":83892,"corporation":false,"usgs":true,"family":"Hildenbrand","given":"T.G.","email":"","affiliations":[],"preferred":false,"id":213423,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kucks, R.P.","contributorId":53758,"corporation":false,"usgs":true,"family":"Kucks","given":"R.P.","affiliations":[],"preferred":false,"id":213422,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Heigold, Paul C.","contributorId":100922,"corporation":false,"usgs":true,"family":"Heigold","given":"Paul","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":213424,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70018820,"text":"70018820 - 1996 - Pliocene and early Pleistocene environments and climates of the western Snake River Plain, Idaho","interactions":[],"lastModifiedDate":"2024-09-30T15:59:00.338944","indexId":"70018820","displayToPublicDate":"1996-04-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2673,"text":"Marine Micropaleontology","active":true,"publicationSubtype":{"id":10}},"title":"Pliocene and early Pleistocene environments and climates of the western Snake River Plain, Idaho","docAbstract":"Sedimentological, palynological, and magnetic susceptibility data provide paleoenvironmental and paleoclimatic information from a 989 ft (301 m) core of sediments from the upper Glenns Ferry and Bruneau Formations from near the town of Bruneau in Owyhee County, Idaho. Chronology is based on stratigraphic position, paleomagnetism, and biostratigraphic data, which collectively suggest a late Gauss Normal-Polarity Chron age for the Glenns Ferry sediments and a middle Matuyama Reversed-Polarity Chron age for the Bruneau sediments. A deep lake was present on the western Snake River Plain during the portions of the time represented by the Glenns Ferry Formation, and the mudstones of the lower half of the core were apparently deposited in this lake. The terminal regression of the Glenns Ferry lake may be represented in the Bruneau core by sandy mudstones and sands that overlie the deep-water mudstones. A cobble layer present in the core between the Glenns Ferry lake beds and those of the overlying Bruneau Formation may indicate through-flow by the ancestral Snake River.
Palynological data from the Glenns Ferry sediments in the Bruneau core reveal a pollen flora similar to the modern regional pollen flora, with very rare occurrences of now-extirpated taxa common earlier in the Tertiary. Palynological data from the Pliocene portion of this core indicate conditions more moist than today, with cooler summers and perhaps warmer winters. Quasi-periodic fluctuations in coniferous pollen (primarily Pinus) versus arid steppe taxa (primarily Chenopodiaceae/Amar-anthus) indicate significant variations in moisture through the lower two-thirds of the Glenns Ferry portion of the core. Shorter wave-length fluctuations in magnetic susceptibility and (inversely) Artemisia may reflect variations in temperature or other unidentified climatic variables. The pollen spectra from the Bruneau Formation sediments in the Bruneau core are dominated by Artemisia and resemble those of the Wisconsinan glacial period on the Snake River Plain, and hence indicate cold and dry conditions during some portion of the early Pleistocene.
The deep-water Glenns Ferry lacustrine episode appears to date between approximately 3.5 to 3.3 and 2.5 Ma, and thus occurred during the middle Pliocene period of warmer-than-modern global temperatures. Similar sustained wetter-than-present conditions occurred in the same age range at sites across the western U.S.A. from southern California and Arizona to northern California and Idaho. This moist period was apparently followed by an interval of regional arid conditions that persisted for several hundred thousand years.
","language":"English","publisher":"Elsevier","doi":"10.1016/0377-8398(95)00056-9","usgsCitation":"Thompson, R.S., 1996, Pliocene and early Pleistocene environments and climates of the western Snake River Plain, Idaho: Marine Micropaleontology, v. 27, no. 1-4, p. 141-156, https://doi.org/10.1016/0377-8398(95)00056-9.","productDescription":"16 p.","startPage":"141","endPage":"156","costCenters":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"links":[{"id":226521,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Idaho","otherGeospatial":"western Snake River Plain","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -117.12644856805878,\n 44.75494380211967\n ],\n [\n -117.12644856805878,\n 43.03170351478383\n ],\n [\n -114.78362293505984,\n 43.03170351478383\n ],\n [\n -114.78362293505984,\n 44.75494380211967\n ],\n [\n -117.12644856805878,\n 44.75494380211967\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"27","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a7c63e4b0c8380cd79968","contributors":{"authors":[{"text":"Thompson, Robert S. 0000-0001-9287-2954 rthompson@usgs.gov","orcid":"https://orcid.org/0000-0001-9287-2954","contributorId":891,"corporation":false,"usgs":true,"family":"Thompson","given":"Robert","email":"rthompson@usgs.gov","middleInitial":"S.","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":380845,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70018614,"text":"70018614 - 1996 - A benthic foraminiferal record of middle to late Pliocene (3.15-2.85 Ma) deep water change in the North Atlantic","interactions":[],"lastModifiedDate":"2024-09-30T16:24:26.495648","indexId":"70018614","displayToPublicDate":"1996-04-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2673,"text":"Marine Micropaleontology","active":true,"publicationSubtype":{"id":10}},"title":"A benthic foraminiferal record of middle to late Pliocene (3.15-2.85 Ma) deep water change in the North Atlantic","docAbstract":"Records of benthic foraminifera from North Atlantic DSDP Site 607 and Hole 610A indicate changes in deep water conditions through the middle to late Pliocene (3.15 to 2.85 Ma). Quantitative analyses of modern associations in the North Atlantic indicate that seven species, Fontbotia wuellerstorfi, Cibicidoides kullenbergi, Uvigerina peregrina, Nuttallides umboniferus, Melonis pompilioides, Globocassidulina subglobosa and Epistominella exigua are useful for paleoenvironmental interpretation. The western North Atlantic basin (Site 607) was occupied by North Atlantic Deep Water (NADW) until ~2.88 Ma. At that time, N. umboniferus increased, indicating an influx of Southern Ocean Water (SOW). The eastern North Atlantic basin (Hole 610A) was occupied by a relatively warm water mass, possibly Northeastern Atlantic Deep Water (NEADW), through ~2.94 Ma when SOW more strongly influenced the site. These interpretations are consistent with benthic δ18O and δ13C records from 607 and 610A (Raymo et al., 1992). The results presented in this paper suggest that the North Atlantic was strongly influenced by northern component deep water circulation until 2.90–2.95 Ma. After that there was a transition toward a glacially driven North Atlantic circulation more strongly influenced by SOW associated with the onset of Northern Hemisphere glaciation. The circulation change follows the last significant SST and atmospheric warming prior to ~2.6 Ma.
","language":"English","publisher":"Elsevier","doi":"10.1016/0377-8398(95)00058-5","usgsCitation":"Ishman, S.E., 1996, A benthic foraminiferal record of middle to late Pliocene (3.15-2.85 Ma) deep water change in the North Atlantic: Marine Micropaleontology, v. 27, no. 1-4, p. 165-180, https://doi.org/10.1016/0377-8398(95)00058-5.","productDescription":"16 p.","startPage":"165","endPage":"180","costCenters":[],"links":[{"id":227657,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"27","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e31ae4b0c8380cd45e16","contributors":{"authors":[{"text":"Ishman, Scott E.","contributorId":8122,"corporation":false,"usgs":true,"family":"Ishman","given":"Scott","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":380223,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":58663,"text":"mf1176I - 1996 - Mineral resource potential of the Survey Pass quadrangle, Brooks Range, Alaska","interactions":[],"lastModifiedDate":"2022-05-06T19:37:24.313935","indexId":"mf1176I","displayToPublicDate":"1996-04-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":325,"text":"Miscellaneous Field Studies Map","code":"MF","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"1176","chapter":"I","title":"Mineral resource potential of the Survey Pass quadrangle, Brooks Range, Alaska","docAbstract":"No abstract available.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/mf1176I","usgsCitation":"Grybeck, D.J., Nelson, S., Cathrall, J.B., Cady, J.W., and LeCompte, J., 1996, Mineral resource potential of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map 1176, Report: 16 p.; 1 Plate: 44.00 × 26.50 inches, https://doi.org/10.3133/mf1176I.","productDescription":"Report: 16 p.; 1 Plate: 44.00 × 26.50 inches","costCenters":[],"links":[{"id":105546,"rank":700,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_6583.htm","linkFileType":{"id":5,"text":"html"},"description":"6583"},{"id":88548,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/mf/1996/1176i/report.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":88547,"rank":400,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/mf/1996/1176i/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":182061,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/mf/1996/1176i/report-thumb.jpg"}],"scale":"250000","country":"United States","state":"Alaska","otherGeospatial":"Brooks Range, Survey Pass quadrangle","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -156,67 ], [ -156,68 ], [ -153,68 ], [ -153,67 ], [ -156,67 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e49fae4b07f02db5f3d55","contributors":{"authors":[{"text":"Grybeck, D. J.","contributorId":47367,"corporation":false,"usgs":true,"family":"Grybeck","given":"D.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":260314,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Nelson, S.W.","contributorId":67869,"corporation":false,"usgs":true,"family":"Nelson","given":"S.W.","email":"","affiliations":[],"preferred":false,"id":260315,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Cathrall, J. B.","contributorId":29400,"corporation":false,"usgs":true,"family":"Cathrall","given":"J.","middleInitial":"B.","affiliations":[],"preferred":false,"id":260313,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Cady, J. W.","contributorId":81892,"corporation":false,"usgs":true,"family":"Cady","given":"J.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":260316,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"LeCompte, J.R.","contributorId":24851,"corporation":false,"usgs":true,"family":"LeCompte","given":"J.R.","email":"","affiliations":[],"preferred":false,"id":260312,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70018584,"text":"70018584 - 1996 - Influence of stretching and density contrasts on the chemical evolution of continental magmas: An example from the Ivrea-Verbano Zone","interactions":[],"lastModifiedDate":"2023-09-22T16:10:55.919698","indexId":"70018584","displayToPublicDate":"1996-04-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1336,"text":"Contributions to Mineralogy and Petrology","active":true,"publicationSubtype":{"id":10}},"title":"Influence of stretching and density contrasts on the chemical evolution of continental magmas: An example from the Ivrea-Verbano Zone","docAbstract":"The southern Ivrea-Verbano Zone of the Italian Western Alps contains a huge mafic complex that intruded high-grade metamorphic rocks while they were resident in the lower crust. Geologic mapping and chemical variations of the igneous body were used to study the evolution of underplated crust. Slivers of crustal rocks (septa) interlayered with igneous mafic rocks are concentrated in a narrow zone deep in the complex (Paragneiss-bearing Belt) and show evidence of advanced degrees of partial melting. Variations of rare-earth-element patterns and Sr isotope composition of the igneous rocks across the sequence are consistent with increasing crustal contamination approaching the septa. Therefore, the Paragneiss-bearing Belt is considered representative of an “assimilation region” where in-situ interaction between mantle- and crust-derived magmas resulted in production of hybrid melts. Buoyancy caused upwards migration of the hybrid melts that incorporated the last septa and were stored at higher levels, feeding the Upper Mafic Complex. Synmagmatic stretching of the assimilation region facilitated mixing and homogenization of melts. Chemical variations of granitoids extracted from the septa show that deep septa are more depleted than shallow ones. This suggests that the first incorporated septa were denser than the later ones, as required by the high density of the first-injected mafic magmas. It is inferred that density contrasts between mafic melts and crustal rocks play a crucial role for the processes of contamination of continental magmas. In thick under plated crust, the extraction of early felsic/hybrid melts from the lower crust may be required to increase the density of the lower crust and to allow the later mafic magmas to penetrate higher crustal levels.
","language":"English","publisher":"Springer Link","doi":"10.1007/s004100050153","usgsCitation":"Sinigoi, S., Quick, J.E., Mayer, A., and Budahn, J., 1996, Influence of stretching and density contrasts on the chemical evolution of continental magmas: An example from the Ivrea-Verbano Zone: Contributions to Mineralogy and Petrology, v. 123, no. 3, p. 238-250, https://doi.org/10.1007/s004100050153.","productDescription":"13 p.","startPage":"238","endPage":"250","numberOfPages":"13","costCenters":[],"links":[{"id":227169,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"123","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a3b7fe4b0c8380cd625ad","contributors":{"authors":[{"text":"Sinigoi, S.","contributorId":77245,"corporation":false,"usgs":true,"family":"Sinigoi","given":"S.","affiliations":[],"preferred":false,"id":380114,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Quick, J. E.","contributorId":48563,"corporation":false,"usgs":true,"family":"Quick","given":"J.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":380113,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Mayer, A.","contributorId":96780,"corporation":false,"usgs":true,"family":"Mayer","given":"A.","email":"","affiliations":[],"preferred":false,"id":380115,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Budahn, J. 0000-0001-9794-8882","orcid":"https://orcid.org/0000-0001-9794-8882","contributorId":33034,"corporation":false,"usgs":true,"family":"Budahn","given":"J.","affiliations":[],"preferred":false,"id":380112,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70017816,"text":"70017816 - 1996 - Middle Pliocene sea surface temperatures: A global reconstruction","interactions":[],"lastModifiedDate":"2024-09-30T16:47:39.944836","indexId":"70017816","displayToPublicDate":"1996-04-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2673,"text":"Marine Micropaleontology","active":true,"publicationSubtype":{"id":10}},"title":"Middle Pliocene sea surface temperatures: A global reconstruction","docAbstract":"Identification and analyses of Pliocene marine microfossils from 64 globally distributed stratigraphic sequences have been used to produce a middle Pliocene sea surface temperature reconstruction of the Earth. This reconstruction shows little or no change from current conditions in low latitude regions and significant warming of the ocean surface at mid and higher latitudes of both hemispheres. This pattern of warming is consistent with terrestrial records and suggests a combination of enhanced meridional ocean heat transport and enhanced greenhouse effect were responsible for the middle Pliocene warmth.
","language":"English","publisher":"Elsevier","doi":"10.1016/0377-8398(95)00050-X","usgsCitation":"Dowsett, H., Barron, J., and Poore, R., 1996, Middle Pliocene sea surface temperatures: A global reconstruction: Marine Micropaleontology, v. 27, no. 1-4, p. 13-25, https://doi.org/10.1016/0377-8398(95)00050-X.","productDescription":"13 p.","startPage":"13","endPage":"25","costCenters":[{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true}],"links":[{"id":228581,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"27","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a56dce4b0c8380cd6d89c","contributors":{"authors":[{"text":"Dowsett, Harry 0000-0003-1983-7524","orcid":"https://orcid.org/0000-0003-1983-7524","contributorId":203003,"corporation":false,"usgs":true,"family":"Dowsett","given":"Harry","affiliations":[],"preferred":false,"id":377649,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Barron, John","contributorId":87059,"corporation":false,"usgs":true,"family":"Barron","given":"John","affiliations":[],"preferred":false,"id":377650,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Poore, R.","contributorId":16180,"corporation":false,"usgs":true,"family":"Poore","given":"R.","email":"","affiliations":[],"preferred":false,"id":377648,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70018717,"text":"70018717 - 1996 - Evidence of Pliocene Nothofagus in Antarctica from Pliocene marine sedimentary deposits (DSDP Site 274)","interactions":[],"lastModifiedDate":"2024-09-30T16:08:03.405268","indexId":"70018717","displayToPublicDate":"1996-04-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2673,"text":"Marine Micropaleontology","active":true,"publicationSubtype":{"id":10}},"title":"Evidence of Pliocene Nothofagus in Antarctica from Pliocene marine sedimentary deposits (DSDP Site 274)","docAbstract":"Microfossil assemblages in Pliocene sediments from DSDP Site 274 (68 °59.81′S, 173 °25.64′E) provide data on the age of the sediments and suggest the presence of Nothofagus (southern beech) in Antarctica during the Pliocene. A suite of 17 samples was collected in an interval from Samples 28-274-6R-1, 83–87 cm to 28-274-11R-4, 73–77 cm (48.33–100.29 mbsf). Bio-stratigraphic study of the abundant diatom assemblages combined with published radiolarian data indicates that the sample interval ranges in age from 5.0 to 2.2 Ma, with an apparent unconformity between about 3.8 and 3.2 Ma. Nothofagidites (the genus for fossil pollen referable to Nothofagus) occurs throughout the interval, as well as pollen and spores with known stratigraphic ranges that unequivocally indicate reworking from older rocks. Species of Nothofagidites recovered include N. asperus, N. brachyspinulosus, N. flemingii, N. senectus, and N. sp. cf. N. lachlaniae; the latter form is previously known from the Sirius Group in the Transantarctic Mountains.
Abundant palynomorphs were recovered in only three of the samples from Site 274 (Samples 28-274-9R-2, 15–19 cm; 28-274-9R-2, 48–52 cm; and 28-274-9R-2, 65–69 cm). Based on the diatom and radiolarian biostratigraphic data, the ages of these samples range from 3.00 to 3.01 Ma. The relative abundance of N. sp. cf. N. lachlaniae in the three samples is an order of magnitude higher than relative abundances for the other species of Nothofagidites in the same samples. The significantly higher relative abundance of N. sp. cf. N. lachlaniae suggests that this pollen was derived from trees of Nothofagus that were living in Antarctica during the mid Pliocene. Diatom assemblages from these three samples indicate that sediments in this interval were rapidly deposited as biogenic oozes in an open-ocean setting relatively free of sea ice, thus decreasing the possibility of reworking from a single source bed rich in N. sp. cf. N. lachlaniae. Clearly, more detailed work in additional well-dated cores from around Antarctica is needed before a clear picture of the Neogene history of Antarctic terrestrial vegetation emerges.
","language":"English","publisher":"Elsevier","doi":"10.1016/0377-8398(95)00062-3","usgsCitation":"Fleming, R., and Barron, J.A., 1996, Evidence of Pliocene Nothofagus in Antarctica from Pliocene marine sedimentary deposits (DSDP Site 274): Marine Micropaleontology, v. 27, no. 1-4, p. 227-236, https://doi.org/10.1016/0377-8398(95)00062-3.","productDescription":"10 p.","startPage":"227","endPage":"236","costCenters":[{"id":49175,"text":"Geology, Energy & Minerals Science Center","active":true,"usgs":true}],"links":[{"id":227266,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"27","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0d5ee4b0c8380cd52f9b","contributors":{"authors":[{"text":"Fleming, R. Farley","contributorId":83950,"corporation":false,"usgs":true,"family":"Fleming","given":"R. Farley","affiliations":[],"preferred":false,"id":380542,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Barron, John A.","contributorId":116559,"corporation":false,"usgs":true,"family":"Barron","given":"John","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":380543,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":33606,"text":"b2142 - 1996 - Thermal evolution of sedimentary basins in Alaska","interactions":[],"lastModifiedDate":"2025-03-06T19:51:53.04338","indexId":"b2142","displayToPublicDate":"1996-04-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":306,"text":"Bulletin","code":"B","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"2142","title":"Thermal evolution of sedimentary basins in Alaska","docAbstract":"The complex tectonic collage of Alaska is reflected in\r\nthe conjunction of rocks of widely varying thermal maturity.\r\nIndicators of the level of thermal maturity of rocks exposed\r\nat the surface, such as vitrinite reflectance and conodont color\r\nalteration index, can help constrain the tectonic evolution of\r\nsuch complex regions and, when combined with petrographic,\r\nmodern heat flow, thermogeochronologic, and isotopic data,\r\nallow for the detailed evaluation of a region?s burial and uplift\r\nhistory. We have collected and assembled nearly 10,000\r\nvitrinite-reflectance and conodont-color-alteration index values from the literature, previous U.S. Geological Survey investigations,\r\nand our own studies in Alaska. This database\r\nallows for the first synthesis of thermal maturity on a broadly\r\nregional scale.\r\nPost-accretionary sedimentary basins in Alaska show\r\nwide variability in terms of thermal maturity. The Tertiary\r\ninterior basins, as well as some of the forearc and backarc\r\nbasins associated with the Aleutian Arc, are presently at their\r\ngreatest depth of burial, with immature rocks exposed at the\r\nsurface. Other basins, such as some backarc basins on the\r\nAlaska Peninsula, show higher thermal maturities, indicating\r\nmodest uplift, perhaps in conjunction with higher geothermal\r\ngradients related to the arc itself. Cretaceous ?flysch?\r\nbasins, such as the Yukon-Koyukuk basin, are at much higher\r\nthermal maturity, reflecting great amounts of uplift perhaps\r\nassociated with compressional regimes generated through\r\nterrane accretion. Many sedimentary basins in Alaska, such\r\nas the Yukon-Koyukuk and Colville basins, show higher thermal\r\nmaturity at basin margins, perhaps reflecting greater uplift\r\nof the margins in response to isostatic unloading, owing\r\nto erosion of the hinterland adjacent to the basin or to compressional\r\nstresses adjacent to basin margins.","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/b2142","usgsCitation":"1996, Thermal evolution of sedimentary basins in Alaska: U.S. Geological Survey Bulletin 2142, v, 131 p., https://doi.org/10.3133/b2142.","productDescription":"v, 131 p.","costCenters":[],"links":[{"id":3381,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/dds/dds-54/Report/Bull2142.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":61488,"rank":3,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/bul/2142/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":165900,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"},{"id":110059,"rank":4,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_25586.htm","text":"Thermal evolution of sedimentary basins in Alaska","linkFileType":{"id":5,"text":"html"},"description":"25586"},{"id":483001,"rank":5,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_25587.htm","text":"Thermal-maturity patterns and geothermal gradients on the Alaska Peninsula","linkFileType":{"id":5,"text":"html"}},{"id":483002,"rank":6,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_25588.htm","text":"Heat flow and subsurface temperature, North Slope of Alaska","linkFileType":{"id":5,"text":"html"}},{"id":483003,"rank":7,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_25589.htm","text":"Thermotectonic evolution of suspect terranes in the Kandik region of east-central Alaska","linkFileType":{"id":5,"text":"html"}},{"id":483004,"rank":8,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_25590.htm","text":"Stable-isotope and fluid inclusion studies of hydrothermal quartz and calcite veins from the Kandik thrust belt of east-central Alaska - implications for thermotectonic history and terrane analysis","linkFileType":{"id":5,"text":"html"}}],"country":"United 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Mark J.","contributorId":58631,"corporation":false,"usgs":true,"family":"Johnsson","given":"Mark","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":747048,"contributorType":{"id":2,"text":"Editors"},"rank":1},{"text":"Howell, David G.","contributorId":12091,"corporation":false,"usgs":true,"family":"Howell","given":"David","email":"","middleInitial":"G.","affiliations":[],"preferred":true,"id":929912,"contributorType":{"id":2,"text":"Editors"},"rank":2}]}} ,{"id":70018117,"text":"70018117 - 1996 - Southeast Atlantic marine and terrestrial response to middle Pliocene climate change","interactions":[],"lastModifiedDate":"2024-09-30T16:31:55.654209","indexId":"70018117","displayToPublicDate":"1996-04-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2673,"text":"Marine Micropaleontology","active":true,"publicationSubtype":{"id":10}},"title":"Southeast Atlantic marine and terrestrial response to middle Pliocene climate change","docAbstract":"Analysis of planktic foraminifers and pollen from Deep Sea Drilling Project Site 532 located on the continental margin of southwest Africa provides information on the link between Pliocene paleoceanographic conditions and paleoenvironments of southwest Africa. Increased upwelling at Site 532 correlates with southward migration of onshore vegetation regions. Both terrestrial and marine changes can be explained by changes in the southern hemisphere surface temperature gradient which affected the paleo-position of subtropical high pressure cells and productivity of water masses during the Pliocene. When the subtropical high pressure cells were further south, Southern Ocean waters were warmer, contained less sea ice, Southern Ocean diatom productivity was high, and nutrient depleted water upwelled off southwest Africa. When the subtropical high pressure cells were in a configuration similar to the present, Southern Ocean waters were cooler and contained more sea ice, the aerial extent of Southern Ocean diatom productivity was limited, and nutrient rich waters upwelled off southwest Africa as the Benguela upwelling system migrated closer to the position of Site 532.
","language":"English","publisher":"Elsevier","doi":"10.1016/0377-8398(95)00059-3","usgsCitation":"Dowsett, H., and Willard, D., 1996, Southeast Atlantic marine and terrestrial response to middle Pliocene climate change: Marine Micropaleontology, v. 27, no. 1-4, p. 181-193, https://doi.org/10.1016/0377-8398(95)00059-3.","productDescription":"13 p.","startPage":"181","endPage":"193","costCenters":[{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true}],"links":[{"id":227274,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"27","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b93d4e4b08c986b31a6de","contributors":{"authors":[{"text":"Dowsett, Harry 0000-0003-1983-7524","orcid":"https://orcid.org/0000-0003-1983-7524","contributorId":202989,"corporation":false,"usgs":true,"family":"Dowsett","given":"Harry","affiliations":[],"preferred":false,"id":378526,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Willard, D. 0000-0003-4878-0942","orcid":"https://orcid.org/0000-0003-4878-0942","contributorId":67676,"corporation":false,"usgs":true,"family":"Willard","given":"D.","affiliations":[],"preferred":false,"id":378527,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":1001151,"text":"1001151 - 1996 - Long-term declines in nest success of prairie ducks","interactions":[],"lastModifiedDate":"2024-12-27T16:49:22.745483","indexId":"1001151","displayToPublicDate":"1996-04-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2508,"text":"Journal of Wildlife Management","active":true,"publicationSubtype":{"id":10}},"title":"Long-term declines in nest success of prairie ducks","docAbstract":"Increased predation on nests of ducks in prairie uplands, as a result of habitat alteration, has been hypothesized to cause decreased nest success and population sizes. We tested whether, and by how much, nest success declined using data compiled from 37 studies conducted between 1935 and 1992 at 67 sites in the Prairie Pothole Region of Canada and the United States. Nest success declined (P = 0.0002) over time, but time explained only 10% of the variation; precipitation (P = 0.79) did not account for additional variation in nest success. Nest success declined at similar (P = 0.13) rates among 5 species, but late nesters (gadwall [Anas strepera], blue-winged teal [A. discors] and northern shoveler [A. clypeata]) had higher success (P = 0.004) than early nesters (mallard [A. platyrhynchos] and northern pintail [A. acuta]). Populations of gadwalls and northern shovelers, however, have not declined, indicating that declines in nest success may not be related causally to population change. Long-term population declines in blue-winged teal, northern pintails, and mallards coincide with large-scale temporal declines in nest success. Declines in nest success were parallel in parkland and grassland regions, suggesting a causal agent (or agents) that act(s) at a broad scale, despite inherent differences in the composition of the predator communities and habitats between regions.
","language":"English","publisher":"Wildlife Society","doi":"10.2307/3802222","usgsCitation":"Beauchamp, W., Koford, R.R., Nudds, T.D., Clark, R.G., and Johnson, D.H., 1996, Long-term declines in nest success of prairie ducks: Journal of Wildlife Management, v. 60, no. 2, p. 247-257, https://doi.org/10.2307/3802222.","productDescription":"11 p.","startPage":"247","endPage":"257","costCenters":[{"id":480,"text":"Northern Prairie Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":134026,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Canada, United States","otherGeospatial":"Prairie Pothole Region","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -117.6621026378391,\n 54.22960374181571\n ],\n [\n -115.1710009797501,\n 50.95601012821028\n ],\n [\n -114.7031548073634,\n 48.53100061727011\n ],\n [\n -104.08194910332246,\n 48.4450463601093\n ],\n [\n -98.34665404574199,\n 42.8487699482325\n ],\n [\n -96.96190905464837,\n 43.10358039599805\n ],\n [\n -95.6089231851656,\n 44.322050477856095\n ],\n [\n -96.17349364011999,\n 46.33095729323018\n ],\n [\n -98.2749286963188,\n 47.68249972207552\n ],\n [\n -99.4153286142953,\n 50.889542061873414\n ],\n [\n -117.6621026378391,\n 54.22960374181571\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"60","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a61e4b07f02db63599a","contributors":{"authors":[{"text":"Beauchamp, W.D.","contributorId":89494,"corporation":false,"usgs":true,"family":"Beauchamp","given":"W.D.","email":"","affiliations":[],"preferred":false,"id":310600,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Koford, Rolf R.","contributorId":16347,"corporation":false,"usgs":true,"family":"Koford","given":"Rolf","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":310597,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Nudds, Thomas D.","contributorId":178164,"corporation":false,"usgs":false,"family":"Nudds","given":"Thomas","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":310598,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Clark, Robert G.","contributorId":33781,"corporation":false,"usgs":false,"family":"Clark","given":"Robert","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":310601,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Johnson, Douglas H. 0000-0002-7778-6641","orcid":"https://orcid.org/0000-0002-7778-6641","contributorId":70327,"corporation":false,"usgs":true,"family":"Johnson","given":"Douglas","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":310599,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70208571,"text":"70208571 - 1996 - Food availability and feeding preferences of breeding fulvous whistling-ducks in Louisiana ricefields","interactions":[],"lastModifiedDate":"2020-02-17T12:25:16","indexId":"70208571","displayToPublicDate":"1996-03-31T12:17:18","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":5932,"text":"Wilson Bulletin","active":true,"publicationSubtype":{"id":10}},"title":"Food availability and feeding preferences of breeding fulvous whistling-ducks in Louisiana ricefields","docAbstract":"Expansion of the breeding distribution of the Fulvous whistling-duck (Dendrocygna bicolor) into the southeastern United States after the mid-1800s coincided with the establishment of rice (Oryza sativa) cultures in Texas, Louisiana, and Florida. In southern Louisiana, where approximately 80% of rice is aerially seeded in water, Fulvous whistling-ducks are suspected of feeding extensively on planted rice and are considered a nuisance. To determine the extent of rice utilization by ducks nesting in southwestern Louisiana, we estimated food availability in ricefields and assessed feeding preferences. We also examined effects of sex and stage of reproduction on food selection. Feeding sites in Louisiana ricefields that were tilled and flooded in preparation for spring planting, contained abundant foods (mean ± SE = 109.0 ± 18.0 g/m2, especially seeds of moist soil plants such as signalgrass (Brachiaria extensa), beakrush (Rhynchospora sp.), and flatsedge (Cyperus iria). Diets of males and females were similar (P = 0.080), but varied through the reproductive cycle (P = 0.008). Consumption of plant material was slightly reduced during the period of rapid ovarian follicle growth in females; however, ingestion of animal foods never exceeded 4%. Fulvous whistling-ducks exhibited feeding preferences (P < 0.001) with aquatic earthworms (Oligochaeta) and wild millet seeds (Echinochloa sp.) being preferred over other food taxa. Rice made up <4% of the diet and was selected in proportion to its availability before and during period of rapid follicle development. Almost 25% of the diet of incubating females consisted of rice; however, we concluded that crop depredation by Fulvous whistling-ducks (≤0.1%) was of minor importance relative to other potential sources of crop loss. Indeed, use of ricefields by whistling-ducks may actually benefit farmers if ingestion of seeds of undesirable plants reduces the need for costly herbicide treatments.
","language":"English","publisher":"Wilson Ornithological Society","usgsCitation":"Hohman, W.L., Stark, T.M., and Moore, J.L., 1996, Food availability and feeding preferences of breeding fulvous whistling-ducks in Louisiana ricefields: Wilson Bulletin, v. 108, no. 1, p. 137-150.","productDescription":"14 p.","startPage":"137","endPage":"150","costCenters":[{"id":455,"text":"National Wetlands Research Center","active":true,"usgs":true},{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true}],"links":[{"id":372391,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":372390,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://www.jstor.org/stable/4163646"}],"country":"United States","state":"Louisiana","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -93.8671875,\n 29.668962525992505\n ],\n [\n -92.625732421875,\n 29.668962525992505\n ],\n [\n -92.625732421875,\n 30.680439786468128\n ],\n [\n -93.8671875,\n 30.680439786468128\n ],\n [\n -93.8671875,\n 29.668962525992505\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"108","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Hohman, William L.","contributorId":73141,"corporation":false,"usgs":false,"family":"Hohman","given":"William","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":782561,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Stark, Timothy M.","contributorId":222564,"corporation":false,"usgs":false,"family":"Stark","given":"Timothy","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":782562,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Moore, Joseph L.","contributorId":182520,"corporation":false,"usgs":false,"family":"Moore","given":"Joseph","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":782563,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70207783,"text":"70207783 - 1996 - On the relationship between plant species diversity and biomass: A comment on a paper by Gough, Grace and Taylor","interactions":[],"lastModifiedDate":"2020-01-10T11:34:48","indexId":"70207783","displayToPublicDate":"1996-03-31T11:30:27","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2939,"text":"Oikos","active":true,"publicationSubtype":{"id":10}},"title":"On the relationship between plant species diversity and biomass: A comment on a paper by Gough, Grace and Taylor","docAbstract":"No abstract available.
","language":"English","publisher":"Wiley","doi":"10.2307/3546258","usgsCitation":"Marrs, R.H., Grace, J.B., and Gough, L., 1996, On the relationship between plant species diversity and biomass: A comment on a paper by Gough, Grace and Taylor: Oikos, v. 75, no. 2, p. 323-326, https://doi.org/10.2307/3546258.","productDescription":"4 p.","startPage":"323","endPage":"326","costCenters":[{"id":455,"text":"National Wetlands Research Center","active":true,"usgs":true},{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true}],"links":[{"id":371158,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"75","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Marrs, R. H.","contributorId":221644,"corporation":false,"usgs":false,"family":"Marrs","given":"R.","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":779315,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Grace, James B. 0000-0001-6374-4726 gracej@usgs.gov","orcid":"https://orcid.org/0000-0001-6374-4726","contributorId":884,"corporation":false,"usgs":true,"family":"Grace","given":"James","email":"gracej@usgs.gov","middleInitial":"B.","affiliations":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true},{"id":455,"text":"National Wetlands Research Center","active":true,"usgs":true},{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true}],"preferred":true,"id":779316,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Gough, L.","contributorId":53971,"corporation":false,"usgs":true,"family":"Gough","given":"L.","affiliations":[],"preferred":false,"id":779317,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70211064,"text":"70211064 - 1996 - Controls on 222Rn variations in a fractured crystalline rock aquifer evaluated using aquifer tests and geophysical logging","interactions":[],"lastModifiedDate":"2021-02-01T14:56:28.157324","indexId":"70211064","displayToPublicDate":"1996-03-31T10:01:42","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3825,"text":"Groundwater","active":true,"publicationSubtype":{"id":10}},"displayTitle":"Controls on 222Rn variations in a fractured crystalline rock aquifer evaluated using aquifer tests and geophysical logging","title":"Controls on 222Rn variations in a fractured crystalline rock aquifer evaluated using aquifer tests and geophysical logging","docAbstract":"Concentrations of 222Rn in ground water may vary considerably within megascopically homogeneous rocks over relatively short distances. Calculations indicate that different hydraulic apertures of water‐bearing fractures may account for variations in dissolved 222Rn concentration measured in domestic water wells completed in fractured Pikes Peak Granite, assuming that all other factors influencing dissolved 222Rn concentrations are constant. Concentrations of dissolved 222Rn range from 124 to 840 kBq m‐3 [3,360 to 22,700 picocuries per liter (pCi L‐1)] within a 2.5 km2 well field. Aquifer tests show that transmissivities range from 0.072 to 160 m2 day‐1 within the well field. Acoustic televiewer and heat‐pulse flow meter logging of four wells reveals that, despite tens to hundreds of fractures that intersect each well, a single fracture supplies all the flow to three wells, and one fracture provides 65% of the flow to the fourth well. Aquifer tests indicate that two pairs of the four wells are hydraulically connected. Type‐curve interpretation of early‐time data from aquifer tests reveals classic half‐slope behavior on log‐log plots of drawdown versus time for two wells, suggesting linear flow to a single fracture. Drawdown versus time for the other two wells indicates radial or pseudo‐radial flow, which suggests a higher degree of fracture interconnectivity near those boreholes.
Hydraulic apertures calculated using the cubic law are 0.024 and 0.038 cm for producing fractures in the first hydraulically connected well pair and 0.011 and 0.020 cm for flowing fractures in the second well pair. Assuming uniform distribution of 226Ra along fracture walls and long residence time of water relative to 222Rn decay, the ratio of fracture apertures should equal the inverse ratio of 222Rn concentration in each well. Assuming 50% error in hydraulic aperture estimation and 10% analytical uncertainty in 222Rn measurement, differences in 222Rn concentration between wells in the hydraulically connected pairs can be attributed solely to differences in hydraulic aperture. Different hydraulic apertures, however, do not explain different 222Rn concentrations between well pairs. Allowing for measurement error, a cubic meter of rock transfers from 1.3 to 20 times more 222Rn to ground water in the first pair of wells than in the second pair. Nonuniform distribution of 226Ra along fracture walls, heterogeneous emanating power in the rock‐water system, or short ground‐water residence time along the transmissive fracture network may account for the difference between well pairs.
","language":"English","publisher":"National Groundwater Association","doi":"10.1111/j.1745-6584.1996.tb01885.x","usgsCitation":"Folger, P.F., Poeter, E., Wanty, R.B., Frishman, D., and Day, W., 1996, Controls on 222Rn variations in a fractured crystalline rock aquifer evaluated using aquifer tests and geophysical logging: Groundwater, v. 34, no. 2, p. 250-261, https://doi.org/10.1111/j.1745-6584.1996.tb01885.x.","productDescription":"12 p.","startPage":"250","endPage":"261","costCenters":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"links":[{"id":376324,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Colorado","otherGeospatial":"Conifer, Elk Creek drainage basin, Pine Junction","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -105.39527893066406,\n 39.44520783247914\n ],\n [\n -105.28987884521484,\n 39.44520783247914\n ],\n [\n -105.28987884521484,\n 39.5712929506796\n ],\n [\n -105.39527893066406,\n 39.5712929506796\n ],\n [\n -105.39527893066406,\n 39.44520783247914\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"34","issue":"2","noUsgsAuthors":false,"publicationDate":"2005-08-04","publicationStatus":"PW","contributors":{"authors":[{"text":"Folger, P. F.","contributorId":57862,"corporation":false,"usgs":true,"family":"Folger","given":"P.","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":792648,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Poeter, E.","contributorId":48708,"corporation":false,"usgs":true,"family":"Poeter","given":"E.","affiliations":[],"preferred":false,"id":792649,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wanty, Richard B. 0000-0002-2063-6423 rwanty@usgs.gov","orcid":"https://orcid.org/0000-0002-2063-6423","contributorId":443,"corporation":false,"usgs":true,"family":"Wanty","given":"Richard","email":"rwanty@usgs.gov","middleInitial":"B.","affiliations":[{"id":211,"text":"Crustal Geophysics and Geochemistry Science Center","active":true,"usgs":true}],"preferred":true,"id":792650,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Frishman, D.","contributorId":14959,"corporation":false,"usgs":true,"family":"Frishman","given":"D.","affiliations":[],"preferred":false,"id":792651,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Day, W. 0000-0002-9278-2120","orcid":"https://orcid.org/0000-0002-9278-2120","contributorId":72136,"corporation":false,"usgs":true,"family":"Day","given":"W.","affiliations":[],"preferred":false,"id":792652,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70207067,"text":"70207067 - 1996 - T.C. Chamberlin, early American hydrogeologist","interactions":[],"lastModifiedDate":"2019-12-05T09:24:59","indexId":"70207067","displayToPublicDate":"1996-03-31T09:21:14","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1923,"text":"Hydrogeology Journal","active":true,"publicationSubtype":{"id":10}},"title":"T.C. Chamberlin, early American hydrogeologist","docAbstract":"No abstract available.
","language":"English ","doi":"10.1007/s10040-996-0004-9","issn":"14312174","usgsCitation":"Back, W., 1996, T.C. Chamberlin, early American hydrogeologist: Hydrogeology Journal, v. 4, no. 3, p. 94-95, https://doi.org/10.1007/s10040-996-0004-9.","productDescription":"2 p.","startPage":"94","endPage":"95","costCenters":[],"links":[{"id":369964,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"4","issue":"3","noUsgsAuthors":false,"publicationDate":"2012-11-20","publicationStatus":"PW","contributors":{"authors":[{"text":"Back, W.","contributorId":33839,"corporation":false,"usgs":true,"family":"Back","given":"W.","email":"","affiliations":[],"preferred":false,"id":776740,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70246755,"text":"70246755 - 1996 - Long-period volcano seismicity: Its source and use in eruption forecasting","interactions":[],"lastModifiedDate":"2023-07-18T16:30:34.094325","indexId":"70246755","displayToPublicDate":"1996-03-28T11:27:58","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2840,"text":"Nature","active":true,"publicationSubtype":{"id":10}},"title":"Long-period volcano seismicity: Its source and use in eruption forecasting","docAbstract":"At an active volcano, long-period seismicity (with typical periods in the range 0.2–2 s) reflects pressure fluctuations resulting from unsteady mass transport in the sub-surface plumbing system, and hence provides a glimpse of the internal dynamics of the volcanic edifice. When this activity occurs at shallow depths, it may signal the pressure-induced disruption of the steam-dominated region of the volcano, and can accordingly be a useful indicator of impending eruption.
","language":"English","publisher":"Nature","doi":"10.1038/380309a0","usgsCitation":"Chouet, B.A., 1996, Long-period volcano seismicity: Its source and use in eruption forecasting: Nature, v. 380, p. 309-316, https://doi.org/10.1038/380309a0.","productDescription":"8 p.","startPage":"309","endPage":"316","costCenters":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"links":[{"id":419059,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"380","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Chouet, Bernard A. 0000-0001-5527-0532 chouet@usgs.gov","orcid":"https://orcid.org/0000-0001-5527-0532","contributorId":3304,"corporation":false,"usgs":true,"family":"Chouet","given":"Bernard","email":"chouet@usgs.gov","middleInitial":"A.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":878177,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70209261,"text":"70209261 - 1996 - Linking sediment transport and stratigraphy on the continental shelf","interactions":[],"lastModifiedDate":"2020-03-25T14:56:10","indexId":"70209261","displayToPublicDate":"1996-03-25T14:44:54","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2929,"text":"Oceanography","active":true,"publicationSubtype":{"id":10}},"title":"Linking sediment transport and stratigraphy on the continental shelf","docAbstract":"The goal of the shelf sediment dynamics component of STRATAFORM is to link sediment transport processes active on the continental shelf to the formation and preservation of event beds in shelf sediment deposits. An approach combining shelf sediment-transport models with high-resolution measurements of water-column and bed properties over periods from several months to several years allows us to make quantitative estimates of bed modification caused by sediment resuspension during episodic transport events. These modifications include erosion and deposition of bed material, formation of graded storm beds, and changes in small-scale bed surface morphology. The characteristics of the resulting “event bed” (thickness, grading, physical structures) are a function of flow and bed properties, depending on both temporal and spatial variations in sediment transport.
","language":"English","publisher":"Oceanography","doi":"10.5670/oceanog.1996.02","usgsCitation":"Wiberg, P., Cacchione, D., Sternberg, R.W., and Donelson Wright, L., 1996, Linking sediment transport and stratigraphy on the continental shelf: Oceanography, v. 9, no. 3, p. 153-157, https://doi.org/10.5670/oceanog.1996.02.","productDescription":"5 p.","startPage":"153","endPage":"157","costCenters":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":479042,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.5670/oceanog.1996.02","text":"Publisher Index Page"},{"id":373530,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"9","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Wiberg, P.L.","contributorId":33827,"corporation":false,"usgs":true,"family":"Wiberg","given":"P.L.","email":"","affiliations":[],"preferred":false,"id":785622,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Cacchione, D.A.","contributorId":65448,"corporation":false,"usgs":true,"family":"Cacchione","given":"D.A.","affiliations":[{"id":520,"text":"Pacific Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":false,"id":785623,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Sternberg, Richard W.","contributorId":101005,"corporation":false,"usgs":true,"family":"Sternberg","given":"Richard","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":785624,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Donelson Wright, L.","contributorId":223609,"corporation":false,"usgs":false,"family":"Donelson Wright","given":"L.","email":"","affiliations":[],"preferred":false,"id":785625,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70170891,"text":"70170891 - 1996 - Concepts for an index of biotic integrity for streams of the Red River of the North Basin","interactions":[],"lastModifiedDate":"2018-03-12T11:23:36","indexId":"70170891","displayToPublicDate":"1996-03-02T13:45:00","publicationYear":"1996","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Concepts for an index of biotic integrity for streams of the Red River of the North Basin","docAbstract":"No abstract available.
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Halodule wrightii dominated the entire upper laguna, and total biomass was quite uniform near 160 g˙m-2 throughout. Four species shared dominance in the lower laguna. Where present mean biomass of Thalassia testudinum was 373 g˙m-2; Syringodium filiforme, 138 g˙m-2; Halodule wrightii, 78 g˙m-2; and Halophila engelmannii, 6 g˙m-2. Macroalgae were widespread, at 71 g˙m-2 where present. Halodule wrightii was dominant and biomass was low on sand flats of the barrier island separating the laguna from the gulf. Halophila engelmannii was limited to the deep edges of meadows. Biomass >300 g˙m-2 was limited to one extensive T. testudinum meadow at the south end of the laguna at all vegetated depths and two small areas with S. filiforme dominant at intermediate depths. Laguna Madre was similar in biomass to the two regions of extensive development of seagrasses in the eastern gulf: the Big Bend region of Florida (Iverson and Bittaker, 1986) and Florida Bay (Iverson and Bittaker, 1986; Zieman, et al., 1989). The laguna differed from the eastern gulf sites in more turbid waters and much shallower maximum depths of occurrence of seagrasses (<2 m compared to 8–11 m), higher contribution of H. wrightii to system-wide biomass (although H. wrightii's share has rapidly diminished in Laguna Madre as it has been displaced by S. filiforme and T. testudinum [Quammen and Onuf, 1993]), and much higher macroalgal biomass (limited to the section of the lower laguna receiving agricultural inflows). Similarities in the environments of Laguna Madre and inner Florida Bay suggest that, if cover and biomass of Thalassia continue to increase, the laguna may become vulnerable to mass mortalities as are now occurring in Florida Bay.
We tracked 10 ultrasonically tagged shortnose sturgeons Acipenser brevirostrurn during spring in the Merrimack River to investigate spawning. Seven fish in 1989 and six fish in 1990 were tracked intensively to identify the timing and location of spawning and to characterize spawning habitat. In mid‐April 1989 and 1990, fish moved upstream to just below head of tide, concentrating in a 2‐km reach at river kilometers 30–32 (measured from the mouth) at Haverhill, Massachusetts. The estimated spawning time was a 5‐d period (26–30 April) in 1989 and an 8‐d period (22–29 April) in 1990. Spawning sites covered about 10.5 ha in 1989 and 13.5 ha in 1990. Fish spawned as river temperature increased from 9.6 to 14.0°C and river discharge decreased from 390 to 240 m3/s. Physical characteristics of spawning sites were boulder–rubble substrate, water depth of 1.8–5.5 m, and bottom water velocity of 0.3–0.7 m/s. We captured no ovulating females but verified successful spawning in 1990 by capturing two live embryos. Gill‐net captures and telemetry during spring showed that some males moved to the spawning area annually. The low abundance estimates of spawning fish (9 in 1989 and 16 in 1990) indicate that the shortnose sturgeon population in the Merrimack River is the smallest yet identified and is likely vulnerable to extirpation.
","language":"English","publisher":"American Fisheries Society","doi":"10.1577/1548-8659(1996)125<0179:SOTSSI>2.3.CO;2","usgsCitation":"Kieffer, M., and Kynard, B., 1996, Spawning of the shortnose sturgeon the Merrimack River, Massachusetts: Transactions of the American Fisheries Society, v. 125, no. 2, p. 179-186, https://doi.org/10.1577/1548-8659(1996)125<0179:SOTSSI>2.3.CO;2.","productDescription":"8 p.","startPage":"179","endPage":"186","costCenters":[{"id":365,"text":"Leetown Science Center","active":true,"usgs":true}],"links":[{"id":131398,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Massachusetts","otherGeospatial":"Merrimack River","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -71.51392948351533,\n 42.72903272456571\n ],\n [\n -71.53431455346316,\n 42.654040010125044\n ],\n [\n -71.09383580903399,\n 42.6630481467904\n ],\n [\n -70.89191791250171,\n 42.80375942573201\n ],\n [\n -70.82054163893226,\n 42.899535691539256\n ],\n [\n -71.05914645706065,\n 42.856884666058484\n ],\n [\n -71.24880248808684,\n 42.74243989278075\n ],\n [\n -71.51392948351533,\n 42.72903272456571\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"125","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e49e4e4b07f02db5e6611","contributors":{"authors":[{"text":"Kieffer, M.C. 0000-0001-9310-018X","orcid":"https://orcid.org/0000-0001-9310-018X","contributorId":26259,"corporation":false,"usgs":true,"family":"Kieffer","given":"M.C.","affiliations":[],"preferred":false,"id":320864,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kynard, B.","contributorId":51232,"corporation":false,"usgs":true,"family":"Kynard","given":"B.","email":"","affiliations":[],"preferred":false,"id":320865,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":33198,"text":"b2070 - 1996 - Dissolved radon and uranium, and ground-water geochemistry in an area near Hylas, Virginia","interactions":[],"lastModifiedDate":"2012-02-02T00:09:27","indexId":"b2070","displayToPublicDate":"1996-03-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":306,"text":"Bulletin","code":"B","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"2070","title":"Dissolved radon and uranium, and ground-water geochemistry in an area near Hylas, Virginia","language":"ENGLISH","publisher":"U.S. G.P.O.,","doi":"10.3133/b2070","usgsCitation":"Stanton, M.R., Wanty, R., Lawrence, E., and Briggs, P., 1996, Dissolved radon and uranium, and ground-water geochemistry in an area near Hylas, Virginia: U.S. Geological Survey Bulletin 2070, iv, 23 p. ill., map ;28 cm., https://doi.org/10.3133/b2070.","productDescription":"iv, 23 p. ill., map ;28 cm.","costCenters":[],"links":[{"id":162965,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/bul/2070/report-thumb.jpg"},{"id":60996,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/bul/2070/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a81e4b07f02db64a24b","contributors":{"authors":[{"text":"Stanton, Mark R. mstanton@usgs.gov","contributorId":1834,"corporation":false,"usgs":true,"family":"Stanton","given":"Mark","email":"mstanton@usgs.gov","middleInitial":"R.","affiliations":[],"preferred":true,"id":210156,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wanty, R. 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L.","contributorId":95484,"corporation":false,"usgs":true,"family":"Morin","given":"R.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":263655,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":34611,"text":"b2094E - 1996 - Patterns of diagenesis in Lower and Middle Pennyslvanian sandstones of the Illinois Basin, Illinois, Indiana, and Kentucky","interactions":[],"lastModifiedDate":"2012-02-02T00:09:20","indexId":"b2094E","displayToPublicDate":"1996-03-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":306,"text":"Bulletin","code":"B","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"2094","chapter":"E","title":"Patterns of diagenesis in Lower and Middle Pennyslvanian sandstones of the Illinois Basin, Illinois, Indiana, and Kentucky","language":"ENGLISH","publisher":"U.S. G.P.O.,","doi":"10.3133/b2094E","usgsCitation":"Hansley, P.L., 1996, Patterns of diagenesis in Lower and Middle Pennyslvanian sandstones of the Illinois Basin, Illinois, Indiana, and Kentucky: U.S. Geological Survey Bulletin 2094, iv, p. 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The objective of the study was to correlate hormone profiles with reproductive status and determine if red kangaroos follow the general pattern elucidated for other macropodids. During Phase 2a lactation (<70 days) plasma progesterone concentrations were <189 pg/ml (n= 41). This value increased to >600 pg/ml (n= 32) during the transition to Phase 3 lactation (181 to 235 days) when the quiescent corpus luteum and embryo were reactivated. Progesterone concentrations then decreased to <300 pg/ml (n= 29) during dual lactation when females were suckling a neonate and a young at foot. Concentrations of prolactin during Phase 2a were <6 ng/ml (n= 17). Coincident with the period of reactivation of the diapausing blastocyst (181 to 235 days), plasma prolactin concentrations increased to 15 ng/ml (n= 32), then decreased and remained low through the subsequent stage of dual lactation. These results indicate that progesterone and prolactin profiles in wild red kangaroos follow patterns found previously in other macropodid species, the tammar and Bennett's wallabies.
","language":"English","publisher":"Elsevier","doi":"10.1006/gcen.1996.0034","usgsCitation":"Muths, E., and Hinds, L., 1996, Circulating levels of prolactin and progesterone in a wild population of red kangaroos (Macropus rufus) Marsupialia: Macropodidae: General and Comparative Endocrinology, v. 101, no. 3, p. 317-322, https://doi.org/10.1006/gcen.1996.0034.","productDescription":"6 p.","startPage":"317","endPage":"322","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":291,"text":"Fort Collins Science Center","active":true,"usgs":true}],"links":[{"id":325318,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"101","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"578a092de4b0c1aacab7d3ef","contributors":{"authors":[{"text":"Muths, E.","contributorId":6394,"corporation":false,"usgs":true,"family":"Muths","given":"E.","affiliations":[],"preferred":false,"id":642597,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hinds, L. A.","contributorId":172919,"corporation":false,"usgs":false,"family":"Hinds","given":"L. A.","affiliations":[],"preferred":false,"id":642598,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ]}