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Last modified
7/14/2009 5:02:33 PM
Creation date
5/20/2009 10:21:35 AM
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UCREFRP
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
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1 <br />(1.654 - 3,452 CFS) <br />N = 4 FISH <br />0.8 <br />} <br />U <br />Z 0.6 <br />W <br />C7 <br />W 0.4 <br />0` <br />LL <br />0.2 <br />0 <br />1 <br />0.8 <br />} <br />U <br />W 0.6 <br />D <br />0 <br />0.4 <br />W <br />U_ <br />0.2 <br />0 <br /> <br />GP BA ED PO SR FR RI RA <br />Figure 17. Habitat frequency of use by adult Colorado squawfish during winter. Top graph: <br />percent use averaged across fish; bottom graph: total number of locations in each habitat type <br />divided by the total number of locations. <br />Ranking Flow Levels by Weighted Area of Preferred Winter Habitats (Objective No. 3) <br />During the winter months, we only identified which habitats were preferred at moderate-flow <br />levels. During summer, we saw that habitat usage changed as flows became low. We do not know <br />whether this is also the case during winter. In fact, because the range of mean monthly flows when <br />winter habitat use data were collected was 1,654-3,452 cfs, the only discharge levels studied during <br />the mapping effort that roughly corresponded to this were 1,630 and 2,870 cfs. Of these, 1,630 cfs <br />provided the highest weighted area of preferred habitats (Fig. 19); weighted area was 25% higher <br />than at 2,870 cfs. When we included lower discharge levels in our comparison, 1,630 cfs remained <br />the discharge with the highest weighted area until we reached the lowest discharge at which habitats <br />were mapped: 557 cfs. At this level, absolute pool area goes up as slow runs lose velocity. <br />35 <br />GP BA ED PO SR FR RI RA
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