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Last modified
8/11/2009 11:32:58 AM
Creation date
8/10/2009 5:11:06 PM
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UCREFRP
UCREFRP Catalog Number
9699
Author
Brunson, R.E., and K.D. Christopherson.
Title
Larval razorback sucker and bonytail survival and growth in the presence of nonnative fish in the Baeser floodplain wetland of the middle Green River.
USFW Year
2005.
USFW - Doc Type
Utah Division of Wildlife Resources, Vernal, Utah.
Copyright Material
NO
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floodplain wetland (Christopherson et al. 2004), evaluated growth and survival of larval <br />razorback sucker following "reset" (i.e. elimination) of the fish population due to an <br />extended drought and subsequent drying of the floodplain depression. Two enclosures <br />were used to control the experiment. Nonnative fish species obtained from the river and <br />a nearby floodplain were introduced at densities present during the natural connection of <br />the river with the floodplain wetland (Birchell et. al. 2002). Larval razorback sucker and <br />bonytail were then stocked into the enclosures at very high densities. These razorback <br />sucker and bonytail larvae along with introduced nonnative species were maintained in <br />the enclosures for approximately three months. During this time, nonnative species <br />reproduced and dramatically increased in numbers. Subsequent sampling to evaluate <br />growth and survival revealed that several thousand larval razorback sucker and bonytail <br />survived in the presence of abundant nonnative fishes. <br />This study evaluates survival of larval razorback sucker and bonytail at much <br />lower densities following reset of the floodplain fish population than those described in <br />Christopherson et. al. 2004. It provides the Recovery Program with an estimate of the <br />density of larval razorback sucker and bonytail necessary for measurable survival in the <br />presence of expected predator densities in a reset floodplain wetland. <br />Specific objectives were to: <br />1. Evaluate survival and growth of larval razorback sucker in the presence of <br />nonnative predators by introducing larvae into experimental enclosures over a <br />range of densities. <br />2 <br />
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