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Last modified
7/14/2009 5:01:48 PM
Creation date
5/22/2009 12:31:49 PM
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UCREFRP
UCREFRP Catalog Number
9724
Author
Coggins, L.G., W.E. Pine, C.J. Walters, D.R. VanHaverbeke, D. Ward and H.C. Johnstone.
Title
Abundance trends and status of the Little Colorado River population of humpback chub.
USFW Year
2006.
USFW - Doc Type
North American Journal of Fisheries Management
Copyright Material
YES
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<br />~.DCb I (Dj~\ ^~e:l u...\ <br /> <br />Nonh American Journal of FisMries Managemen! 26:233-245, 2006 <br />@ Copyrighl by lite American Fisheries Socie1y 2006 <br />DOllO.1577/MOS-07S.1 <br /> <br />17;4 <br /> <br />[Article] <br /> <br />Abundance Trends and Status of the Little Colorado River <br />Population of Humpback Chub <br /> <br />LEWIS G. COGGINS JR.* <br /> <br />u.s. Geological Survey, Southwest Biological Science Center, Grand Canyon Monitoring and Research <br />Center, 2255 North Gemini Drive, Flagstaff, Arizona 86001, USA <br /> <br />WILLIAM E. PINE III <br /> <br />Department of Fisheries and Aquatic Sciences, University of Florida, 7922 Northwest 71st Street, <br />Gainesville, Florida 32653, USA <br /> <br />CARL J. WALTERS <br /> <br />Fisheries Centre, University of British Columbia, 2259 Lower Mall, <br />Vancouver, British Columbia V6T 1ZA, Canada <br /> <br />DAVID R. VAN HAVERBEKE <br /> <br />U.S. Fish and Wildlife Service, Arizona Fishery Resources Office, <br />323 North Leroux, Suite 401, Flagstaff, Arizona 86001, USA <br /> <br />DA VID WARD <br /> <br />Arizona Game and Fish Department, Research Branch, <br />2221 West Greenway Road, Phoenix, Ariwna 85023, USA <br /> <br />HELENE C. JOHNSTONE <br /> <br />SWCA Environmental Consultants. <br />114 North San Francisco Street, Suite 100. Flagstaff, Arizona 86001, USA <br /> <br />Abstract.- The abundance of the Little Colorado River population of federally listed humpback chub Gila <br />cypha in Grand Canyon has been monitored since the late 1980s by means of catch rate indices and capture- <br />recapture-based abundance estimators. Analyses of data from all sources using various methods are consistent <br />and indicate that the adult population has declined since monitoring began. Intensive tagging led to a high <br />proportion (> 80%) of the adult population being marked by the mid-I 990s. Analysis of these data using both <br />closed and open abundance estimation models yields results that agree with catch rate indices about the extent <br />of the decline. Survival rates for age-2 and older fish are age dependent but apparently not time dependent <br />Back-calculation of recruitment using the apparent 1990s population age structure implies periods of higher <br />recruitment in the late 1970s to early 1980s than is now the case. Our analyses indicate that the U.S. Fish and <br />Wildlife Service recovery criterion of stable abundance is not being met for this population. Also, there is <br />a critical need to develop new abundance indexing and tagging methods so that early, reliable, and rapid <br />estimates of humpback chub recruitment can be obtained to evaluate population responses to management <br />actions designed to facilitate the restoration of Colorado River native fish communities. <br /> <br />The humpback chub Gila cypha, a cyprinid endemic <br />to the Colorado River basin, was described in 1945 <br />from a specimen captured near the mouth of Bright <br />Angel Creek in Grand Canyon, Arizona (Miller 1946). <br />This morphologically unique cyprinid has been <br />characterized as the most specialized member of the <br />genus Gila and is highly adapted to exist in turbulent <br />canyon-bound reaches of the Colorado River basin <br />(Minckley 1973). This species was included on the <br /> <br />* Corresponding author: IcogginS@usgs.gov <br /> <br />Received May 6, 2005; accepted August 15, 2005 <br />Published online February 3, 2006 <br /> <br />federal list of endangered species in 1967 (USOFR <br />1967) and is protected under the Endangered Species <br />Act (ESA) of 1973. Presently, only six populations are <br />known, five in the upper basin of the Colorado River <br />(i.e., above Lees Ferry) and one in Grand Canyon <br />(Valdez and Ryel 1995). <br />The humpback chub population in Grand Canyon is <br />centered near the confluence of the Colorado and Little <br />Colorado rivers (LCR) in Grand Canyon (36. 19"N, <br />111.79"W; Kaeding and Zimmerman 1983; Douglas <br />and Marsh 1996; Gorman and Stone 1999). Valdez and <br />Ryel (1995) describe the humpback chub distribution <br />as consisting of nine aggregations throughout Marble <br /> <br />233 <br />
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