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Last modified
7/14/2009 5:02:35 PM
Creation date
5/20/2009 10:08:17 AM
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UCREFRP
UCREFRP Catalog Number
9360
Author
Bundy, J. M. and K. R. Bestgen.
Title
Evaluation of the Interagency Standardized Monitoring program Sampling Technique in Backwaters of the Colorado River in the Grand Valley, Colorado.
USFW Year
2001.
USFW - Doc Type
Fort. Collins.
Copyright Material
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ISMP backwater sampling evaluation <br />Fish community and habitat relationships <br />We also explored the relationship between biotic and physical habitat variables and the <br />presence and abundance of green sunfish, largemouth bass, and the three non-native cyprinids. <br />Probability of fish presence as a function of four habitat variables, backwater area, mean depth, <br />maximum depth, the qualitative index of habitat complexity, and the year effect, was explored <br />with a binomial regression model with a logit link function. Abundance (density) of green <br />sunfish, largemouth bass, and the three non-native cyprinids as a function of four habitat <br />variables was explored with a general linear model (GLM). Backwater areal, mean depth, <br />maximum depth, and a qualitative index of habitat complexity were the independent variables in <br />the analysis. Because fish abundance data are divided by backwater surface area to yield fish <br />density, the backwater area covariate is expressed as a squared term to avoid confounding. The <br />response variable, estimated fish density (fish/lOm2), was transformed as log (x + 1). In models <br />that predicted non-native cyprinid density, predator density (the sum of the green sunfish and <br />largemouth bass densities in each backwater) was used as an additional covariate. <br />We also assessed the relationship between fish species richness in backwaters as a <br />function of four habitat variables, backwater area, mean depth, maximum depth, the qualitative <br />index of habitat complexity. A GLM that assumed a normal error distribution was used. We <br />also included river kilometer to determine if spatial location affected fish species richness in <br />backwaters. For the purpose of this analysis, a composite estimate of backwater species richness <br />was generated from the results of ISMP and DMR sampling. <br />We also plotted density estimates of the two centrarchids and three non-native cyprinids <br />obtained during 1986 to 1999 during the regular ISMP sampling that was conducted by other <br />-8-
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