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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 />A main premise of making comparisons between density estimates was that the high- <br />effort DMR sampling should provide relatively accurate and precise estimates relative to the <br />low-effort ISMP estimates. For the sake of estimating the bias of the ISMP sampling technique, <br />we consider the estimates derived from DMR sampling to be the "true" estimates (unbiased, no <br />variance) of presence and abundance of fishes in backwaters. We acknowledge that there is error <br />in such abundance estimates and quantify that variation with profile likelihood confidence limits, <br />but assume that the error was small relative to that for the two-seine haul ISMP technique. <br />Comparison of the proportion of ISMP density estimates that fell within the 95 % confidence <br />intervals of DMR estimates would thus provide a conservative measure of the bias of the ISMP <br />technique relative to DMR. Specific goals of comparisons between estimates of detection rates <br />and density derived from ISMP and DMR data were: <br />1) quantify the bias of the ISMP technique to detect presence of green sunfish, <br />largemouth bass, and three abundant non-native cyprinid species (fathead minnow <br />Pimephales promelas, sand shiner Notropis stramineus, red shiner Cyprinella <br />lutrensis) in each backwater, and <br />2) quantify the bias of the ISMP technique to estimate the density of two centrarchid <br />and three cyprinid species in each backwater. <br />If data from DMR sampling in individual backwaters was too sparse to compute abundance <br />estimates in CAPTURE, the total number of fish captured was used as an abundance estimate. <br />Thus, no confidence limits were calculated for those estimates. <br />-7-
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