Minimum Habitat Requirements for Establishing Translocated Cutthroat Trout Populations
2002; Wiley; Volume: 12; Issue: 2 Linguagem: Inglês
10.2307/3060961
ISSN1939-5582
Autores Tópico(s)Aquatic Invertebrate Ecology and Behavior
ResumoEcological ApplicationsVolume 12, Issue 2 p. 535-551 Article MINIMUM HABITAT REQUIREMENTS FOR ESTABLISHING TRANSLOCATED CUTTHROAT TROUT POPULATIONS Amy L. Harig, Amy L. Harig Department of Fishery and Wildlife Biology, Colorado State University, Fort Collins, Colorado 80523 USA Present address: Trout Unlimited, 1966 13th Street, Suite LL60, Boulder, Colorado 80302 USA. E-mail: [email protected]Search for more papers by this authorKurt D. Fausch, Kurt D. Fausch Department of Fishery and Wildlife Biology, Colorado State University, Fort Collins, Colorado 80523 USASearch for more papers by this author Amy L. Harig, Amy L. Harig Department of Fishery and Wildlife Biology, Colorado State University, Fort Collins, Colorado 80523 USA Present address: Trout Unlimited, 1966 13th Street, Suite LL60, Boulder, Colorado 80302 USA. E-mail: [email protected]Search for more papers by this authorKurt D. Fausch, Kurt D. Fausch Department of Fishery and Wildlife Biology, Colorado State University, Fort Collins, Colorado 80523 USASearch for more papers by this author First published: 01 April 2002 https://doi.org/10.1890/1051-0761(2002)012[0535:MHRFET]2.0.CO;2Citations: 139 Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Translocation is an important management strategy in conservation programs for endangered or threatened species, including native cutthroat trout (Oncorhynchus clarki) in the western United States. Most subspecies of cutthroat trout have declined to <5% of their historical range, and both historical and translocated populations now persist in small isolated fragments of habitat. Success rates for translocations of fishes are generally <50%, and habitat quality or quantity are frequently cited as the cause of failure. Therefore, we conducted field surveys of stream-scale habitat and measured basin-scale habitat using a Geographic Information System for 27 streams where two subspecies of cutthroat trout were translocated in Colorado and New Mexico, to identify specific habitat attributes that contribute to the success of translocations. We used polytomous logistic regression to develop models that predict three categories of cutthroat trout translocation success (high, low, absent) from habitat attributes at two spatial scales. Models based on stream-scale habitat attributes indicated that cold summer water temperature, narrow stream width, and lack of deep pools limited translocations of cutthroat trout. Cold summer temperatures are known to delay spawning and prolong egg incubation, which reduces the growth of fry and likely limits their overwinter survival. Furthermore, small streams with few deep pools may lack the space necessary to permit overwinter survival of a sufficient number of individuals to sustain a population. Models based on basin-scale habitat were not as effective as stream-scale habitat models for distinguishing among translocation sites with high, low, or absent population status but indicated that a minimum watershed area of 14.7 km2 was useful as a coarse filter for separating sites with high numbers of cutthroat trout from those with low or absent status. 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