9314 ‎(2)‎

• UCREFRP Catalog Number: 9314
• Author: Wick, E. J. and J. A. Hawkins.
• Title: Colorado Squawfish Winter Habitat Study.
• USFW Year: 1989.
• USFW - Doc Type: Fort Collins.
• Copyright Material: NO

a Lab-Line water sampler containing a 300-milliliter BOD (Biological Oxygen
Demand) bottle to the desired depth and then triggering filling. Samples were
fixed immediately in the field using the Winkler Method (fresh reagents
supplied by Hach Chemical). Fixed samples were titrated indoors upon
returning from the field within 1-6 hr of collection.
Weather data
Average daily minimum and maximum air temperatures at Maybell, Colorado,
were obtained from the Colorado Climate Center, Department of Atmospheric
Science, Colorado State University. Data were collected by the National
Weather Service Cooperative Weather Station in Maybell, Colorado. Minimum and
maximum temperatures during the 2 study years were compared to mean minimum
and maximum temperatures for the 27-year period 1958-1985. The USGS in
Meeker, Colorado, provided mean monthly flaw data for the Yampa River from
1917-1988.
Data analysis
Data were transferred from field data sheets to database files using
fields identified in Appendix B. Additional data fields were added to the
database to aid in data stratification, calculations, and compatibility with
other databases. Negative velocities were converted to positive values in
calculation of descriptive statistics.
For compatibility between years, Winter 1 observations qualified for
analysis only if they were short term (2.5 hr) or the first 2.5 hr of a 24-hr
continuous observation period. Only sample types defined as AT, AN, AW, and
BB (Appendix B) were included.
The long term (24 hr) data partition was used to examine behavioral
differences between morning, afternoon, evening, and night partitions. The
analysis was conducted to investigate temporal differences in depth, velocity,
substrate, and habitat use. Results of this analysis are discussed in Wick
and Hawkins (1987).
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