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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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~, <br />This experiment focused on competition for food between larval Colorado <br />squawfish and larval fathead minnow. Early life stages of Colorado squawfish <br />co-occur with fathead minnow and share habitat and food resources. Young <br />Colorado squawfish, and all life stages of fathead minnow, inhabit shallow <br />near-shore habitats (e.g., backwaters and side channels) and feed on <br />zooplankton, chironomid larvae, and detritus (Vanicek and Kramer 1969; <br />S. J. Grabowski and S. D. Hiebert, unpublished report). At 20 to 30 mm total <br />length, Colorado squawfish begin to consume other small fishes. Thus, intense <br />competition for food between Colorado squawfish and fathead minnow may occur <br />during a relatively short developmental period ranging from onset of exogenous <br />feeding to commencement of piscivory in Colorado squawfish. <br />It has been shown that growth is positively related to fitness and <br />competitive ability (Werner 1976; Mittlebach 1981; Persson 1991). Our <br />experiment was designed to compel the fishes to compete for zooplankton so <br />that the effects of competition on growth could be observed. We determined <br />the outcome of interspecific competition for food between larvae of Colorado <br />squawfish and fathead minnow by (1) estimating relative growth of each species <br />in single-species assemblages and mixed-species assemblages; (2) estimating <br />effects of intraspecific competition; (3) estimating effects of interspecific <br />competition after subtracting effects of intraspecific competition; <br />(4) determining the symmetry of competitive interactions and, if asymmetric, <br />identifying which species was most adversely affected; and (5) confirming <br />results by studying the relation between diet overlap and resource <br />availability. <br />6 <br />
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