1113

• UCREFRP Catalog Number: 1113
• Author: Tyus, H. M.
• Title: Acquisition of Habitat Preference Data By Radiotelemetry, ‎(Proceedings of a Workshop on the Development and Evaluation of Habitat Suitability Criteria)‎.
• USFW Year: 1986.
• USFW - Doc Type: \
• Copyright Material: NO

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Figure 5. Illustration of depth ::nd mean water column transections at the
location of radiotagged Colorado squawfish. Depths drawn to scale; arrows
are vectors of velocity.
(Bovee 1986). This would require more data points across the stream (e.g.,
perhaps at 1-m rather than 10-m increments) or more measurements near the
fish.
Water depths and velocities recorded at the observed locations of radio-
telemetered Colorado squawfish in the Green, Yampa, and White Rivers were
tested by ANOVA (Tyus et al. 1984) in an effort to evaluate potential
differences in microhabitats used. There was no significant difference in the
depths recorded from the Green River between 1980 and 1981, but a comparison
of the mainstem Green River with its tributaries indicated a significant
difference (P < 0.01) between depths recorded from the Green River fish and
fish using its two tributaries (White and Yampa Rivers). Depths recorded
between the White and Yampa Rivers were not significantly different. Although
an ANOVA indicated no significant differences between velocity readings for
Colorado squawfish using both methoc'~ in the Green River in 1980 and 1981,
velocity measurements by both methods were different (P < 0.01) between the
Green, White, and Yampa Rivers. It is not known if these differences are due
to the selection of different habitats or whether these comparisons reflect
different habitats present in these rivers. The results indicate that care
should be taken in lumping date until partitions between streams-can be made
and tested.
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