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Last modified
7/14/2009 5:02:34 PM
Creation date
5/17/2009 11:51:20 PM
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UCREFRP
UCREFRP Catalog Number
9319
Author
Mueller, G., M. Horn, Q. Bradwisch and L. Boobar.
Title
Examination of Native Recruitment and Description of the Fish Communities Found in the San Jan and Colorado River Interface Zones of Lake Powell, Utah.
USFW Year
2001.
USFW - Doc Type
01-159,
Copyright Material
NO
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The endangered humpback chub (Gila c ha is an especially adapted <br />omnivore which prefers to inhabit deep turbulent canyon reaches. The fleshy <br />hump on its back resembling the leading edge of an airplane wing is thought <br />to be an adaptation to assist in holding position in fast turbulent currents such <br />as the habitat in the Grand Canyon (Valdez and Ryel 1995). <br />The endangered bonytail chub (Gila ele ans is very streamlined with <br />a distinctively narrow caudal peduncle. Bonytail inhabit both confined and <br />unconfined river reaches and appear to prefer environments also favored by <br />razorback sucker. Very little information about the bonytail chub's life <br />history was obtained prior to its rapid decline throughout the river system. <br />Other endemic, big-river species in danger include the roundtail chub <br />t Gila robust a), an omnivore most commonly found in mid-size tributary <br />f_ <br />rivers. The flannelmouth sucker (Catostomas lati inus inhabits both tributary <br />streams and larger river environments. The flannelmouth sucker is <br />characterized by very large protruding fleshy lips with numerous papilla <br />which assist it in feeding on bottom detritus, its specialty. The bluehead <br />sucker (Catostomus discobolus), a native also found in a small part of the <br />Bonneville basin, has a special blade-like structure on it's lower jaw that <br />functions as a scraper, enabling this species to scrape food items from green <br />algal colonization on rock substrates (Miller 1964). Bluehead sucker are <br />commonly collected in big rivers from swift riffle areas with rock substrate. <br />Razorback fills the floodplain niche <br />The razorback sucker (Xvrauchen texanus) is an endemic genus and <br />species specially adapted for filter feeding on zooplankton in lentic <br />environments. The genus (Xvrauchen) is closely related genetically to the <br />genus (Catatomus) indicating rapid morphological evoluton into a new niche. <br />( R. Behnke, pers. comm.). The close ralationship between these two genuses <br />is also evident by hybridization. <br />°t 8
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