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Last modified
7/14/2009 5:02:34 PM
Creation date
6/1/2009 12:01:29 PM
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UCREFRP
UCREFRP Catalog Number
8290
Author
Day, K. S. and C. Crosby.
Title
An Assessment of Young-of-the-Year Colorado Squawfish (Ptychocheilus lucius) Use of Backwater Habitats in the Green River, Utah.
USFW Year
1997.
USFW - Doc Type
FG-33,
Copyright Material
NO
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etc. in order for any noticeable coverage to occur, and estimation of cover in <br />was likely skewed to lower levels. Contingency table analysis of the relation <br />squawfish use and aspect showed that Colorado squawfish were found more often <br />opening in a downstream direction. <br />The conditions which evaluation of mean habitat values, cover and aspect <br />most closely by secondary (scour) channel-backwaters. This class of backwater <br />surface area (999 m2), mean depth (0.42 m), cover and aspect values closest to <br />~average~ hackwater used by Colorado squawfish. These tend to be perennial ha <br />change primarily as a result of river levels, but are available every year. T <br />large, deep and turbid. Because of their wide mouths and positioning in the r <br />accumulate more fine substrate and may also more readily capture drifting larv <br />They generally do-not have the extreme temperature fluctuation seen in smaller <br />Whether they show the ~high~ temperature fluctuations indicated to be importan <br />Crowl, et al. (1994) could not be tested. <br />Results of testing the relationship between flows and habitat formation <br />anticipated. It has been thought by many researchers that high spring flows w <br />provide the most habitat. Regression statistics from this study, however, ind <br />the case. Habitat availability, as measured in area and volume, decreased wit <br />flows. Numbers of backwaters available could not be tested directly because <br />of small migrating sand wave backwaters. However, regression of numbers of ba <br />sampled from 1993 to 1996, when methods were standardized and more reliable, i <br />backwater numbers were not correlated with flows. Other investigators have re <br />
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