No abstract available.
Timing of parturition of caribou (Rangifer tarandus) varies within populations, but the relative influences of nutritional condition of females during the autumn breeding season and during gestation on that variation is not known. We determined timing of parturition of caribou in Denali National Park, Alaska, during 1984–1995, which had wide variation in snowfall that influenced nutritional condition and productivity of females. The first young were observed each year between 4 and 15 May. Annual median dates of parturition for radiocollared females during 1987–1995 varied from 13 to 21 May. Synchrony of births (i.e., proportion of births during 7 days centered on the median date) did not vary significantly among years (P > 0.05). Females ≤4 years old were more likely to give birth after the annual median date than older females (P = 0.005). Dates of parturition were significantly correlated with masses of females in the previous autumn (P = 0.034) but not in late winter (P = 0.155). Births tended to be earlier for parous females that were not lactating during the previous breeding season compared to those that were lactating (P = 0.030). Annual onsets of parturition varied significantly with snowfall in late winter prior to conception (P = 0.012) but not with snowfall during gestation. Timing of parturition in our study appeared to be a function of physical condition of breeding females in autumn.
","language":"English","publisher":"Oxford Adacemic","doi":"10.2307/1382865","usgsCitation":"Adams, L., and Dale, B.W., 1998, Timing and synchrony of parturition in Alaska caribou: Journal of Mammalogy, v. 79, no. 1, p. 287-294, https://doi.org/10.2307/1382865.","productDescription":"8 p.","startPage":"287","endPage":"294","costCenters":[{"id":106,"text":"Alaska Biological Science Center","active":false,"usgs":true}],"links":[{"id":479883,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.2307/1382865","text":"Publisher Index Page"},{"id":129597,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"79","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a53e4b07f02db62b504","contributors":{"authors":[{"text":"Adams, Layne G. 0000-0001-6212-2896 ladams@usgs.gov","orcid":"https://orcid.org/0000-0001-6212-2896","contributorId":2776,"corporation":false,"usgs":true,"family":"Adams","given":"Layne G.","email":"ladams@usgs.gov","affiliations":[{"id":117,"text":"Alaska Science Center Biology WTEB","active":true,"usgs":true}],"preferred":true,"id":318458,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Dale, Bruce W.","contributorId":6769,"corporation":false,"usgs":true,"family":"Dale","given":"Bruce","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":318459,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":81552,"text":"81552 - 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1998 - Bird use of fields enrolled in CRP","interactions":[],"lastModifiedDate":"2017-12-27T13:13:19","indexId":"1001738","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2757,"text":"Minnesota Birding","active":true,"publicationSubtype":{"id":10}},"title":"Bird use of fields enrolled in CRP","docAbstract":"Abstract has not been submitted","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Minnesota Birding","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","usgsCitation":"Johnson, D.H., 1998, Bird use of fields enrolled in CRP: Minnesota Birding, v. 31, no. 1, p. 18-19.","productDescription":"2 p.","startPage":"18","endPage":"19","costCenters":[{"id":480,"text":"Northern Prairie Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":130336,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"31","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a2ae4b07f02db612103","contributors":{"authors":[{"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":311638,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":94731,"text":"94731 - 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1998 - The comparative ecology and parasite fauna of exotic invaders in the Great Lakes of the world: Amur sleeper (Perccottus glehni) in Lake Baikal and ruff (sic) (Gymnocephalus cernuus) in Lake Superior","interactions":[],"lastModifiedDate":"2026-02-02T21:07:10.507372","indexId":"1000684","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3389,"text":"Siberian Journal of Ecology","active":true,"publicationSubtype":{"id":10}},"title":"The comparative ecology and parasite fauna of exotic invaders in the Great Lakes of the world: Amur sleeper (Perccottus glehni) in Lake Baikal and ruff (sic) (Gymnocephalus cernuus) in Lake Superior","docAbstract":"No abstract available.
","language":"Russian, English","publisher":"Nauka","usgsCitation":"Pronin, N., Selgeby, J., Litvinov, S., and Pronina, S., 1998, The comparative ecology and parasite fauna of exotic invaders in the Great Lakes of the world: Amur sleeper (Perccottus glehni) in Lake Baikal and ruff (sic) (Gymnocephalus cernuus) in Lake Superior: Siberian Journal of Ecology, v. 5, no. 5, p. 397-406.","productDescription":"9 p.","startPage":"397","endPage":"406","numberOfPages":"9","costCenters":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"links":[{"id":128521,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"5","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4aaae4b07f02db668c81","contributors":{"authors":[{"text":"Pronin, N.M.","contributorId":44106,"corporation":false,"usgs":true,"family":"Pronin","given":"N.M.","email":"","affiliations":[],"preferred":false,"id":309104,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Selgeby, J.H.","contributorId":44859,"corporation":false,"usgs":true,"family":"Selgeby","given":"J.H.","email":"","affiliations":[],"preferred":false,"id":309105,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Litvinov, S.V.","contributorId":64177,"corporation":false,"usgs":true,"family":"Litvinov","given":"S.V.","email":"","affiliations":[],"preferred":false,"id":309106,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Pronina, S.V.","contributorId":33256,"corporation":false,"usgs":true,"family":"Pronina","given":"S.V.","affiliations":[],"preferred":false,"id":309103,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":96573,"text":"96573 - 1998 - Population attributes and health of resident desert tortoises at the Tiefort Mountain Potential Relocation Plot in 1997, National Training Center, Fort Irwin, California","interactions":[],"lastModifiedDate":"2012-02-02T00:03:51","indexId":"96573","displayToPublicDate":"1998-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":9,"text":"Other Report"},"title":"Population attributes and health of resident desert tortoises at the Tiefort Mountain Potential Relocation Plot in 1997, National Training Center, Fort Irwin, California","docAbstract":"No abstract available at this time","language":"English","collaboration":"Report to Dept. of the Army, National Training Center, Fort Irwin.","usgsCitation":"Berry, K., Boland, S., and Jennings, W., 1998, Population attributes and health of resident desert tortoises at the Tiefort Mountain Potential Relocation Plot in 1997, National Training Center, Fort Irwin, California, 43 p. ; 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A range map is provided to indicate the relative densities of the species in North America, based on Breeding Bird Survey (BBS) data. Although birds frequently are observed outside the breeding range indicated, the maps are intended to show areas where managers might concentrate their attention. It may be ineffectual to manage habitat at a site for a species that rarely occurs in an area. The species account begins with a brief capsule statement, which provides the fundamental components or keys to management for the species. A section on breeding range outlines the current breeding distribution of the species in North America, including areas that could not be mapped using BBS data. The suitable habitat section describes the breeding habitat and occasionally microhabitat characteristics of the species, especially those habitats that occur in the Great Plains. Details on habitat and microhabitat requirements often provide clues to how a species will respond to a particular management practice. A table near the end of the account complements the section on suitable habitat, and lists the specific habitat characteristics for the species by individual studies. A special section on prey habitat is included for those predatory species that have more specific prey requirements. The area requirements section provides details on territory and home range sizes, minimum area requirements, and the effects of patch size, edges, and other landscape and habitat features on abundance and productivity. It may be futile to manage a small block of suitable habitat for a species that has minimum area requirements that are larger than the area being managed. The Brown-headed Cowbird (Molothrus ater) is an obligate brood parasite of many grassland birds. The section on cowbird brood parasitism summarizes rates of cowbird parasitism, host responses to parasitism, and factors that influence parasitism, such as nest concealment and host density. The impact of management depends, in part, upon a species' nesting phenology and biology. The section on breeding-season phenology and site fidelity includes details on spring arrival and fall departure for migratory populations in the Great Plains, peak breeding periods, the tendency to renest after nest failure or success, and the propensity to return to a previous breeding site. The duration and timing of breeding varies among regions and years. Species' response to management summarizes the current knowledge and major findings in the literature on the effects of different management practices on the species. The section on management recommendations complements the previous section and summarizes specific recommendations for habitat management provided in the literature. If management recommendations differ in different portions of the species' breeding range, recommendations are given separately by region. The literature cited contains references to published and unpublished literature on the management effects and habitat requirements of the species. This section is not meant to be a complete bibliography; for a searchable, annotated bibliography of published and unpublished papers dealing with habitat needs of grassland birds and their responses to habitat management, use the Grassland and Wetland Birds Bibliography on the home page of this resource.
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Cronkhite, 1063,","publisherLocation":"Sausalito, CA","usgsCitation":"Ettlinger, E., and Howell, J.A., 1998, 1997 summary of coyote research in Golden Gate NRA, 7 p.","productDescription":"7 p.","startPage":"7","numberOfPages":"7","costCenters":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"links":[{"id":127061,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b32e4b07f02db6b4593","contributors":{"authors":[{"text":"Ettlinger, E.","contributorId":18701,"corporation":false,"usgs":true,"family":"Ettlinger","given":"E.","email":"","affiliations":[],"preferred":false,"id":299948,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Howell, J. 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Hepatic concentrations of butyltin compounds (BTs = MBT + DBT + TBT) ranged from 40 to 9200 ng/g wet wt, which varied depending on the sampling location and gender. Concentrations of BTs in sea otters were comparable to those reported in stranded bottlenose dolphins from the U.S. Atlantic Coast during 1989a??1994. Greater accumulation of butyltins in sea otters was explained by their bottom-feeding habit and the diet that consists exclusively of invertebrates such as mollusks and gastropods. Livers of female sea otters contained approximately 2-fold greater concentrations of BTs than did those of males. The composition of butyltin compounds in sea otter tissues was predominated by TBT in most cases and suggestive of recent exposure. Large harbors such as Monterey Harbor that handle ships legally painted with TBT-containing antifouling paints continued to experience ecotoxicologically significant butyltin contamination. Sea otters, which were affected by infectious diseases, contained greater concentrations of BTs in their tissues than those that died from trauma and other unknown causes.
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