8249

• UCREFRP Catalog Number: 8249
• Author: Modde, T., W. J. Miller and R. Anderson.
• Title: Determination of Habitat Availability, Habitat Use, and Flow Needs of Endangered Fished in the Yampa River Between August and October.
• USFW Year: 1999.
• USFW - Doc Type: Project #CAP-9,
• Copyright Material: NO

List of Tabres

Table 2.1. Description of river strata in the Yampa River, Colorado study area, 1996 and 1997. .............25
Table 3.1. Cross-section sampling dates, locations and flow measurements for the 1996-1997 study

period. ......................._....................................................................................................... ................... .46

Table 3.2. Pearson Correlation Matrix of the field-collected data for seven habitat variables among 62
riffle cross sections in the Yampa River. Bold represents significant differences (r>0.5)..................48
Table 3.3. Pearson Correlation Matrix of the curve breaks (cfs) for the seven habitat variables. Bold
represents significant differences (r>O .5)............................................................................................ ..48
Table 3.4. The results of the complete block (flows of 80, 150, and 300 cfs) design ANOY A and Tukeys
Multiple Comparison tests for the macrohabitat data collected for riffle habitat on the Yampa River,
Colorado, 1996 and 1997. I in each column represents sets of comparison without significant

differences.............................. .............................................................................................................. .49

Table 3.5. The results of the complete block (flows of 80, 150, and 300 cfs) design ANOY A for the curve
break cfs data for riffle habitat on the Yampa River, Colorado, 1996 and 1997..............;..................50
Table 3.6. Comparison of mean and standard deviation of curve-break flows (cfs) of six channel variables
collected from 62 cross-sections sampled in riffles in the Yampa River with 50, 75, and 100

percenti Ie flows...................................................................................................................,...... ..........50

Table 3.7. Comparison of mean and standard deviation of curve-break flows (cfs) of six channel variables
collected from 69 cross-sections sampled in runs in the Yampa River with 50, 75, and 100 percentile

flows........................................................................................................................... ..........................51

Table 3.8. Comparison of mean and standard deviation of curve-break flows (cfs) of six channel variables
collected from 30 cross-sections sampled in pools in the Yampa River with-50, 75, and 100 percentile

flows........................................................................................................................... ..........................52

Table 3.9. Comparison of channel variable means and standard deviations for curve-break points from
riffles for strata in Yampa Canyon (strata 1,2, and 3) and above Yampa Canyon (strata 4,6, and 8)
and all strata combined (total mean). N= 62 .......................................................................................53
Table 3.10. Comparison of channel variable means and standard deviations for curve-break points from
runs for strata in Yampa Canyon (strata 1,2, and 3) and above Yampa Canyon (strata 4,6, and 8) and
all strata combined (total mean). N= 69. .............................................................................................54
Table 3.11. Comparison .of channel variable means and standard deviations for curve-break points from
pools for strata in Yampa Canyon (strata 1,2, and 3) and above Yampa Canyon (strata 4,6, and 8) and
all strata combined (total mean). N=30.. .......... .....;.......... ............................. ....... ...............................54
Table 3.12. Mean curve break flows for Colorado pikeminnow nocturnal and diurnal WUA, and
humpback chub shoreline WUA for each stratum in the study area. ...................................................55
Table 4.1. Species, radio frequencies, and capture locations for implanted fish in the Yampa River,

Colorado. .............................................................................................................................. ................63

Table 4.2. List offrequencies, dates and locations offish implanted with radio transmitters in the Yampa
River Canyon during the baseflow periods of 1996 and 1997.......,.....................................................65
Table 4.3. Dates, flow, time spent (Min = minutes) at each passage site by four Colorado pikeminnow
implanted with transmitters as they migrated downstream and upstream of the Yampa River

spawning site............................................................................................................................ ...........83

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