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7/14/2009 5:02:29 PM
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5/22/2009 12:56:21 PM
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UCREFRP
UCREFRP Catalog Number
7229
Author
Kaeding, L. R. and M. A. Zimmerman
Title
Life History and Ecology of the Humpback Chub in the Little Colorado and Colorado Rivers of the Grand Canyon
USFW Year
1983
USFW - Doc Type
Transactions of the American Fisheries Society
Copyright Material
NO
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<br />processes. In Aggus and Morais (1979), catostomid standing crops were used to <br />develop regionalized reservoir fisheries predictive equations. <br /> <br />t <br /> <br />Model 4 <br /> <br />Use the appropri ate reservoi r descri pt i on and sui tabi 1 ity rating 1 i st <br />from McConnell et al. (1982) to calculate an HSI for white suckers in planned <br />reservoirs. <br /> <br />Model 5 <br /> <br />This model was developed after testing the original riverine model in the <br />summer in LaGarde Creek, St. Vrain Creek, and Big Thompson River, Colorado. <br />The model was expanded to include additional variables to better assess adult <br />habitat, spawning habitat and cover. This model follows a life requisite <br />approach, as used in the original riverine model (page 26). Many of the <br />variables are the same used in the original riverine model (turbidity, pH, <br />dissolved oxygen, temperature [adult/juvenile, fry, embryo], riffle velocity, <br />riffle depth, percent cover, percent pools). The new variables include: <br />riverine spawning substrate; pool depth; percent shade; gradient; pool <br />velocity; and spawning distance. Propst (1982b) felt cover was most important <br />in determining the suitability of a stream for white suckers. <br /> <br />This alternate riverine model combines the variables into components of <br />water quality, reproduction, and cover (Fig. 3), which are used to derive the <br />habitat suitability index. Reasons for placing individual variables in <br />specific components are described below. f <br /> <br />Water quality component. Refer to riverine model description (page 14). <br /> <br />Reproduction. Spawning temperature (V6) is included because it influences <br /> <br />spawning migrations, reproductive success, and hatching rates. Larval tem- <br />perature (Vs) is included because of its influence on larval growth and <br /> <br />activity. Riffle velocity (V7) and riffle depth (Va) are important in spawning <br /> <br />site selection. White suckers prefer to spawn in moderately fast, shallow <br />riffle areas, although they are tolerant of a relatively wide range of riffle <br />depths. Spawning substrate (V12) is included because spawning has been <br /> <br />observed over sand and gravel substrates and not over mud or boulders. Spawn- <br />ing habitat distance (V17) is included because we assume the distance fish <br /> <br />must mi grate to spawn i nfl uences reproductive success. Whi te suckers can <br />migrate to and spawn successfully in smal~-streams that do not contain habitat <br />for adults, but do contain spawning habitat and habitat that can support <br />sizable fry and juvenile populations. Quantitative data on the effect of <br />distance on reproductive success are not available, thus, this variable is <br />based solely on professional judgment. <br /> <br />24 <br /> <br />f <br />
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