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Last modified
8/11/2009 11:32:58 AM
Creation date
8/10/2009 5:14:26 PM
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UCREFRP
UCREFRP Catalog Number
9712
Author
U.S. Fish and Wildlife Service.
Title
Genetic characterization of Virgin River chub.
USFW Year
2008.
USFW - Doc Type
Dexter National Fish Hatchery and Technology Center
Copyright Material
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Project Summary: <br />The Virgin River chub is an imperiled species found in the mainstem Virgin River <br />from Utah to Nevada, and the Moapa River in Nevada. In 1989, the Virgin River <br />chub was listed as endangered in the Virgin River pursuant to the Endangered Species <br />Act of 1973, but the population in the Moapa River was not included because available <br />information was insufficient at the time to support listing. Dexter National Fish Hatchery <br />and Technology Center (Dexter) established a refuge population of Virgin River chub in <br />1989. <br />The objectives of this study were to investigate population structure within the <br />range of the species, to compare wild and captive populations, and to characterize extant <br />levels of genetic variation. A total of 223 fish from five sites were analyzed using nine <br />tetranucleotide microsatellite markers. Samples included the Moapa River (N= 66), the <br />lower reach of the Virgin River (N= 15), the upper reach of the Virgin River (N= 50), <br />the Dexter broodstock (N= 42), and the Dexter 2005-6 year class (N= 50). Analyses <br />indicated. that the population in the Moapa River is moderately divergent from the Virgin <br />River populations (FST ranged from 0.092 to 0.126, P< 0.001), and may need. to be <br />considered as a separate management unit. There was a low level of difference <br />between chub from the lower and upper reaches of the Virgin River (FST = 0.020, P < <br />0.001). The captive populations at Dexter were also moderately different than the Moapa <br />River population (FST ranged from 0.098 to 0.118, P < 0.001), but differences were minor <br />between populations from Dexter and the Virgin River (FST ranged from 0.009 to 0.033, <br />P < 0.004), the source of the Dexter broodstock.
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