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Last modified
8/11/2009 11:32:56 AM
Creation date
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UCREFRP
UCREFRP Catalog Number
7743
Author
Miller, A. S. and W. A. Hubert.
Title
Compendium of Existing Knowledge for Use in Making Habitat Management Recommendations for the Upper Colorado River Basin.
USFW Year
1990.
USFW - Doc Type
\
Copyright Material
NO
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31 <br />The filling period was characterized by lower peak flows while • <br />temperature remained essentially unchanged, thus reproductive failure., <br />was attributed to flow regulation. <br />Resource Consultants, Inc. (1985) pointed out that bonytail chub <br />populations declined earlier in the Upper Colorado River mainstem than <br />in the Green River, and that large scale flow depletions occurred earlier <br />in the Colorado River mainstem than in the Green River. <br />Razorback sucker <br />o Recruitment of razorback sucker is highest in high flow years. <br />Johnson and Rinne (1982) reported a correlation between high flow levels and <br />reproductive success of razorback sucker in the lower Colorado River Basin. • <br />It should be noted, however, that razorback sucker populations in the lower <br />basin are often associated with lacustrine habitats, thus extrapolation of such <br />data should be done with caution. <br />Seasonal flow needs. <br />Colorado squawfish <br />o Spring peak flows approaching natural (historic) levels are best for Colorado <br />squawflsh spawning for all but very high discharge years. <br />Haynes et al. (1985) reported the ideal spring flow regime to be one of <br />relatively high peak discharge, but Jones and Tyus (1986) and Tyus et •
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