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Last modified
7/14/2009 5:02:37 PM
Creation date
5/20/2009 9:32:33 AM
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UCREFRP
UCREFRP Catalog Number
9677
Author
Karp, C. A. and H. M. Tyus.
Title
Habitat Use, Spawning, and Species Associations of Humpback Chub, Gila cypha, in the Yampa and Green Rivers, Dinosaur National Monument, Colorado and Utah - Preliminary report.
USFW Year
n.d.
USFW - Doc Type
Vernal, UT.
Copyright Material
NO
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these fishes may occur. Although the incidence of fish predation was <br />deemed low, channel catfish were noted to consume whole fish and fish eggs <br />in DNM (Tyus and Nikirk, In press), and humpback chub remains were found <br />in channel catfish stomachs from the Little Colorado River (W.L. Minckley, <br />Arizona State University, personal communication). Observations of "bite- <br />shaped" abrasions on some chubs in DNM is further indication of adverse <br />impacts that channel catfish may have on the native fishes (there are no <br />other piscivorous fish in that system to have caused such abrasions). Few <br />common carp were captured syntopically with humpback chub, however, their <br />abundance throughout DNM suggests that this introduced species may have <br />some negative impact on native fishes. We emphasize that flows and other <br />factors (e.g., temperature) that may favor potential competitors, such as <br />channel catfish, need to be immediately evaluated for input into recovery <br />efforts for the endangered Colorado River fishes. <br />The humpback chub persists only in a few isolated populations in the <br />Colorado River basin, and some planned water development projects may <br />further jeopardize the survival of this species. Loss or reduction of <br />spring runoff in the Yampa River could reduce the availability of spawning <br />habitat or otherwise alter their formation, and interfere with spawning <br />cues. Alteration of the existing natural flow regimen of the Yampa River <br />may also promote hybridization, as has been suggested in some altered <br />river systems (Valdez and Clemmer 1982), or may result in proliferation of <br />introduced competitor and predator fishes. Efforts should be made to <br />protect flows of the Yampa River to aid recovery of the species to a less <br />endangered status. <br />16
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