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Last modified
7/14/2009 5:02:36 PM
Creation date
5/24/2009 7:27:25 AM
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UCREFRP
UCREFRP Catalog Number
9544
Author
Collins, K., P. and D. K. Shiozawa.
Title
The Effects of Fish Predation on Backwater Invertebrate Communities of the Green River, Utah.
USFW Year
1994.
USFW - Doc Type
Provo, UT.
Copyright Material
NO
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ratios for treatment effects were calculated using the mean square of the block by <br />treatment interaction as the denominator. Normal probability plots showed that the <br />treatment means met the assumption of normality. <br />We also wanted to evaluate the effects of predation on the diversity of <br />copepods and chironomids. The number of samples processed was not always the <br />same, so we used the rarefaction method to obtain the expected number of cyclopoid <br />copepod species and chironomid genera in a sample size of 30. Rarefaction <br />estimates the number of species expected in a random sample of individuals taken <br />from a collection (see Krebs 1989 for methodology). <br />Next, we grouped all taxa into one of four trophic categories: collector/gatherers, <br />herbivores, omnivores, and invertebrate predators. A multivariate analysis of variance <br />(MANOVA) and univariate ANOVA tests were then performed on the log transformed <br />data for both benthic and planktonic organism counts (from weeks 1, 3, and 5) using <br />the same model as in the weighted ANOVA tests. This was to test the effect of the <br />treatments on trophic structure of the whole invertebrate community and on the density <br />of specific trophic levels within the community. <br />Finally, mean densities for control treatments, with 95% confidence intervals, <br />were calculated for the major benthic invertebrate taxa collected on each of the <br />sampling dates. The average densities, with 95% confidence intervals, were <br />calculated for closed and perforated treatments (weeks 1, 3, and 5) for those taxa <br />which had significant p-values (a = 0.05) in weighted ANOVA tests. Means for <br />plankton densities were calculated on log(x+1) transformed count data and then <br />7
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