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Last modified
7/14/2009 5:02:36 PM
Creation date
5/22/2009 5:48:30 PM
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UCREFRP
UCREFRP Catalog Number
9595
Author
CRCT Task Force.
Title
Conservation Agreement and Strategy for Colorado River Cutthroat Trout (Oncorhynchus clarki pleuriticus) in the States of Colorado, Utah, and Wyoming.
USFW Year
1999.
USFW - Doc Type
Fort Collins, CO.
Copyright Material
NO
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<br />for Colorado and Wyoming.. In Colorado, 20 to 30 populations that were founded many years ago <br />from Trappers Lake stock await a final determination on the genetic purity of that stock before their <br />status in conservation planning can be assessed. The issues surrounding a method for measuring <br />viability or stability of the different populations also need to be resolved. However, there is no <br />doubt that significant conservation actions must be implemented to prevent further decline of this <br />fish. <br /> <br />In 1996, the U.S. Fish and Wildlife Service and the National Oceanic and Atmospheric <br />Administration proposed and adopted policy rules that influence a status assessment and <br />conservation of Colorado River cutthroat trout: 1) The proposed Policy on the Treatment of <br />Intercrosses and Intercross Progeny (the issue ofhybridization)(50 CFR Part 424, 61 FR 26), and <br />2) the Policy Regarding the Recognition of Distinct Population Segments under the Endangered <br />Species Act (50 CFR Part IV, 61 FR 26). The proposed policy in (1}has not been finalized. <br /> <br />The proposed Intercross Policy asserts that the U.S. Fish and Wildlife Service's <br />responsibility for conserving species under ESA extends to hybrids (intercrosses) if (1) the progeny <br />share traits that characterize the taxon of the listed parent, and (2) the progeny more closely <br />resemble the listed parent's taxon than an entity intermediate between it and the other known or <br />suspected non-listed parental stock. The proposed policy also makes the distinction that it applies <br />to individuals not to populations. Populations can contain individuals that represent the protected <br />species and individuals that are intercross progeny between the protected species and another. <br /> <br />The policy regarding distinct population segments (DPS) requires that the U.S. Fish and <br />Wildlife Service consider three elements in decisions regarding the status of a possible DPS: (1) <br />discreteness of the population segment in relation to the remainder of the species to which it <br />belongs; (2) the significance of the population segment to the species to which it belongs, and (3) <br />the population segment's conservation status in relation to ESA standards for listing. This policy <br />recognizes the importance of unique taxonomic units in the conservation management of a species. <br /> <br />The application of these policies to the conservation of Colorado River cutthroat trout <br />requires that the status assessment be continued by compiling information for each individual <br />population. In this manner, the influence of hybridization and the presence of unique characteristics <br />of distinct population segments can be determined across and within the designated GMUs. It <br />follows that populations may need to be conselVed throughout the range that contain varying degrees <br />on hybridization. <br /> <br />March 1999 <br /> <br />10 <br />
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