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Last modified
7/14/2009 5:02:33 PM
Creation date
5/24/2009 7:27:30 AM
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UCREFRP
UCREFRP Catalog Number
8133
Author
Collins, K. and D. K. Shiozawa.
Title
The Effects of Fish Predation on Backwater Invertebrate Communities of the Green River, Utah\
USFW Year
1996.
Copyright Material
NO
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Y,jk = µ + B; + D; + BD;; + Tk + BT;k + DTA + BDT;;k <br />where Y;jk is the count mean of the i`' backwater on the j`' date from the k`h treatment, B; is the <br />backwater (block) effect, Dj is the date effect, and Tk is the treatment. F-ratios for treatment <br />effects were calculated using the mean square of the block by treatment interaction as the <br />denominator. Normal probability plots showed that the treatment means met the assumption of <br />normality. <br />We also wanted to evaluate the effects of treatments on the diversity of copepods and <br />chironomids. Since the maximum number of samples processed varied (see above), we used <br />the rarefaction method to obtain the expected number of cyclopoid copepod species and <br />chironomid genera in a sample size of 30. Rarefaction estimates the number of species <br />expected in a random sample of individuals taken from a collection (see Krebs 1989 for <br />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 data <br />for both benthic and planktonic organism counts (from weeks 1, 3, and 5) using the same <br />model as in the weighted ANOVA tests. This was to test the effect of the treatments on trophic <br />structure of the whole invertebrate community and on the density of specific trophic levels <br />within the community. <br />Finally, mean densities for control treatments, with 95 % confidence intervals, were <br />calculated for the major benthic invertebrate taxa collected on each of the sampling dates. The <br />average densities, with 95 % confidence intervals, were calculated for closed and perforated <br />5
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