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Last modified
7/14/2009 5:02:33 PM
Creation date
5/17/2009 11:28:02 PM
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UCREFRP
UCREFRP Catalog Number
8214
Author
Modde, T., D. Irving and R. Anderson.
Title
Habitat Availability and Habitat Use of Endangered Fishes in the Yampa River during Baseflow Periods.
USFW Year
1997.
USFW - Doc Type
Vernal, Utah and Grand Junction, Colorado.
Copyright Material
NO
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<br />RM 21.6 (Freq. 40.7334) and 29.7 (Freq. 40.6233). <br /> <br />Considerable movement was observed among the five humpback chub implanted with <br />transmitters (Figure 8). Average distance moved weekly following the first three weeks of <br />August was 8.2 river miles per week. Greatest movement occurred prior to the third week of <br />August and coincided with greater declines in discharge. After discharge seemed to reach the <br />lower boundaries, movement distance between dates decreased (3.7 miles/week between August <br />22 and September 10). All humpback chub were observed to move upstream at some time during <br />the low flow period, indicating that all fish survived and moved during the length of the study. <br />By the end of October all fish were found in the river above river mile 24.2. <br /> <br />Following implantation of channel catfish minimal movement was detected until the last <br />aerial flight 29 October (Figure 9). Whereas, aerial locations of fish did not vary over one mile in <br />three of five fish (one fish moved 3 miles and one 2 miles), three of four fish moved more than <br />two miles between the last September and October aerial flight dates. One fish moved in <br />downstream in excess of20 miles and another moved upstream approximately 8 miles. <br /> <br />Discussion <br /> <br />Radio telemetry data from the post runoff period indicated that two Colorado squawfish <br />and all channel catfish, and all humpback chub remained in Yampa Canyon during the low flow <br />season. Humpback chub showed the greatest travel distance through this period followed by the <br />two Colorado squawfish and an apparent lack of movement by channel catfish, until movement <br />to overwinter sites within the canyon. Distance traveled between contacts for both Colorado <br />squawfish and humpback chub appeared to decrease following onset of baseflows. <br /> <br />The failure to obtain 24 hr movement data on humpback chub and Colorado squawfish <br />reduce the capability of defining available habitat in the canyon. Greater average depths and <br />increased quantity of large (boulder) substrate may have reduced the effectiveness of collecting <br />telemetry data. Increased trips (with monitoring rafts on each side of the canyon) and the use of a <br />new, longer whip antenna will be used to increase the efficiency of finding fish during the low <br />flo\\' period. <br /> <br />CHAPTER 2: HABITAT QUANTIFICATION <br /> <br />Methods <br /> <br />This study used the eight strata (river reaches) described by Miller ct al. (1 (82) for sample <br />site selection on the Yampa River (Table 1). Four strata were located below Cross Mountain and <br />three above Cross Mountain. Since strata 5 (Cross Mountain Canyon) and strata 7 (Juniper <br />Canyon) were short, they were not included in the sampling design. Sampling sites within the two <br />study strata were randomly selected by dividing the strata into 0.5 mile segments, named clusters. <br /> <br />14 <br />
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