8208

• UCREFRP Catalog Number: 8208
• Author: Osmundson, D. B., P. Nelson, K. Fenton and D. W. Ryden.
• Title: Relationships Between Flow and Rare fish Habitat in the '15-Mile Reach' of the Upper Colorado River.
• USFW Year: 1995.
• USFW - Doc Type: \
• Copyright Material: NO

LIST OF FIGURES
1. Contribution of flows to the Colorado River from the Colorado and
Gunnison rivers, using 1991-1993 as an example ............................... 6
2. Location of the four study sites within the 15-mile reach ......................... 9
3. Frequency of use of nine habitat types by Colorado squawfish in the
upper Colorado River ................................................... 17
4. Frequency of depths (five ranges) at locations of Colorado squawfish
in the upper Colorado River .............................................. 17
5. Frequency of use of nine habitat types by razorback sucker in the
upper Colorado River ........... .................. 19
6. Frequency of depths (five ranges) at locations of razorback sucker
in the upper Colorado River .............................................. 19
7. Seasonal partitioning of the year based on the habitat use behavior of
Colorado squawfish (top), razorback sucker (center), and a
combination of die two (bottom) ........................................... 21
8. Discharge at the top of the 15-mile reach during 1990-1991,
including the days when habitat mapping was conducted ........................ 23
9. Flow level (cfs) on the day of habitat mapping in the four 15-mile
reach study sites . . . . . . . . . . . . . . ...................................... 23
...
10. Maps of Site No. 4 at two different discharge levels showing level
of mesohabitat delineation ................................................ 24
11. Variation in total area (ml) of each of eight habitat types in the four
15-mile reach study sites ............................... . ...... 25
12. Variation in total water area and habitat composition with discharge level ........... 27
13. Frequency of use of habitat types by adult Colorado squawfish in the
15-mile reach study sites during summer periods of moderate flow
and low flow levels ..................................................... 29
14. Habitat composition (percent total area) of the four 15-mile reach study
sites during periods of moderate summer flow levels and low flow levels ........... 30
15. Summer habitat preference by adult Colorado squawfish using one or
more of the four 15-mile reach study sites ................................... 31
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