8144

• UCREFRP Catalog Number: 8144
• Author: Valdez, R. A.
• Title: Evaluation of Habitat Utilization Curves for Endangered Colorado River Fishes.
• USFW Year: 1985.
• USFW - Doc Type: \
• Copyright Material: NO

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1.0 IN1RODUCTIGN

This document is an evaluation of the habitat utilization curves
develope-d by the U.S. Fish and Wildlife Service (FWS 1984) for the
endangered Colorado River fishei. The curvES were iSsued November 20, 1984,
for four life staoes of tt"1e Col orado SQu~Y1fi sh (Ptvchochei 1 us 1 uci us) ann
for ore life stc"gE' of the humpback. chub (Gile v cypha). The habitat
peraMetcrs represe:nted by these habitat utillzatlcn curves are depth,
velocity, SUbstratp, and water temo,=roture.

To provide a better perspective of habitat utilization
2.0 of tnis docu~ent is provided for a description of their
\",ell "s analysis tecr,niques, nCITlEnclature, assufTlptions, Clnd
in ~he concept. The specific evaluation of the FWS curvps
section j.G.

curves, secti on
developMent, as
biases inherent
is presented in