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Last modified
7/14/2009 5:02:34 PM
Creation date
5/24/2009 7:15:36 AM
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UCREFRP
UCREFRP Catalog Number
8291
Author
Chart, T. E. and L. D. Lentsch.
Title
Flow Effects on Humpback Chub (Gila Cypha) Populations in Westwater Canyon.
USFW Year
1997.
USFW - Doc Type
Aspinal-46,
Copyright Material
NO
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YOY chub habitat <br />Low velocity habitats in the three sampling strata were sampled under a variety of flows. The <br />majority (48.3%) of YOY sampling trips (Appendix Table 3 marred when the Colorado river <br />was flowing between 2500 and 5000 cfs, which corresponds with the late summer period when <br />most YOY chubs (75% of the total catch) were collected. The range of sampled flows however, <br />was 2030cfs (29 July 94) to 40000cfs (22 June 95). <br />Above the Ccnryon <br />As discussed in the study area section the three sampled strata varied greatly geomorphically. As <br />would be expected habitat availability varied as well. Upstream of Westwater backwaters were <br />abundant and accounted for 85.5% of the area sampled during the months of July and August, <br />1992-1996 (Table 6). Secondary channels were the only other frequently (9.3%) sampled habitat <br />followed by a variety of types which in the aggregate comprised the remaining 5%. <br />Table 6. Distribution of sampling effort by habitat types in the three sampling sub-reaches. <br />Westwater Canyon, Colorado River, 1992 -1996. See Appendix Table 2 for habitat type <br />descriptions. • <br />HABITAT TYPES ABOVE CANYON <br />w~ sic • ~u a WESTWATER ~• <br />w~-su-trt.eu • s~»s1 •: •BELOW CANYON <br />ri~-s ~s~c d <br />BACKWATER 85.5 27.3 59.6 <br />SHORE~.INE 0.9 44.4 12.5 <br />EMBAYMENT - 17.9 7.6 <br />SIDE CHANNEL 9.3 5.1 1.1 <br />POOL 1.9 1.5 2.0 <br />ISOLATED POOL 2.4 1.2 1.0 <br />FLOODED TRIB - 2.6 16.2 <br />DRAFT <br />• 17 <br />
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