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Last modified
7/14/2009 5:02:31 PM
Creation date
5/22/2009 7:29:13 PM
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UCREFRP
UCREFRP Catalog Number
7760
Author
Beyers, D. W., R. T. Muth and M. S. Farmer.
Title
Experimental Evidence of Competition Between Larvae of Colorado Squawfish and Fathead Minnow.
USFW Year
1994.
USFW - Doc Type
\
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assemblages, the index of competitive ability permitted interspecific <br />comparison of ability of each competitor to obtain limited resources. Values <br />of competitive ability were negative for seven of nine mixed-species <br />treatments suggesting that fathead minnow were superior competitors in those <br />experimental treatments, and that Colorado squawfish were superior in the <br />remaining two experimental treatments. These conclusions are consistent with <br />those from analysis of d. Competitive ability values were positive for two of <br />the three experimental treatments where d values for Colorado squawfish were <br />greater than those for fathead minnow. <br />Diet overlap <br />Diet overlap estimates based on Colorado squawfish and fathead minnow in <br />single-species assemblages ranged from 0.92 to 0.99 (Table 1). These values <br />provide a basis for comparing diet overlap in mixed-species assemblages by <br />showing the range of responses that occurred in absence of interspecific <br />resource competition. There was a variable response of diet overlap in <br />mixed-species assemblages to resource availability. In the two highest <br />feeding regimes there was no relation between diet overlap and resource <br />availability or relative abundance. Overlap at these feeding regimes ranged <br />from 0.70 to 0.98, and four of six values were greater than or equal to 0.91. <br />In contrast, diet overlap in mixed-species assemblages in the lowest feeding <br />regime ranged from 0.66 to 0.88 and was reduced compared to single-species <br />assemblages. There was no apparent relation between diet overlap and relative <br />abundance. <br />16 <br />
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