Laserfiche WebLink
<br />o <br />C'") <br />,..... <br />C:) <br />-.1 <br />..;s <br /> <br /> <br />100 <br /> <br /> <br />CShore <br />IDEddy <br />ORun <br />OSackwater <br />· POOl <br />II Riffle <br />mDebrisPile <br /> <br />80 <br /> <br />i) <br />z <br />w <br />~ <br />g 60 <br />" <br />" <br />o <br />~ <br />z <br />~ 40 <br />~ <br />w <br />~ <br /> <br />20 <br /> <br />o <br /> <br />,,~ <br />.,,-~.$5' ~ <br />~. ~ <br />'" <br /> <br />Figure 3.2. Habitat use recorded for radiotelemetered Colorado pikeminnow in the San <br />Juan River, 1991 to 1995. The total number of radiotelemetry observations <br />during the specified calendar month is shown in parentheses (Source: Ryden <br />2000a). <br /> <br />The top graph of Figure 3.3 shows the habitats used during the pre-spawn period for all Colorado <br />pikeminnow combined. Several fish used the Mancos River confluence, which varied in habitat type <br />depending on flow level. Eddies and nms were used the most, followed by undercut runs, slackwaters, <br />and edge pools. The low-velocity habitats (eddy, slackwater, edge pool) were 2 to 3 oC wanner than the <br />main channel. This habitat use was similar to that documented in the Green, Yampa (Wick et al. 1983, <br />Tyus 1990), and Colorado rivers (Osmundson and Kaeding 1989), where wanner backwaters, eddies, <br />and tributary mouths were used extensively by Colorado pikeminnow during spring high flows. <br /> <br />September 2000 <br /> <br />3-5 <br /> <br />Program Evaluation Report <br />