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1 <br />- At Mineral Bottom, a com arison of catch rates of Colorado ikeminnow in the fall and <br />P P <br />nonnative cyprinids in the summer showed a generally negative association, except for <br />1996, when catch rates for both groups were high. <br />8) Determine the usefulness of video imagery as a predictor of year class strength of Colorado <br />pikeminnow; and 9) Refane the interpretation of video so that "quality" nursery habitats can <br />be distinguished. <br />- In the 1.5 km Ouray reach, the relationship between area of habitat interpreted from the <br />videos and from the field maps was linear (rz = 0.89, p = 0.001). The area interpreted <br />from the video prints tended to slightly underestimate the area interpreted from the field <br />maps. <br /> - This analysis demonstrated that trends in total nursery habitat availability can be <br /> assessed from estimating habitat area from video, but did not assess the availability of <br /> high quality habitats. Although quality can be inferred from geomorphic setting and <br /> size of habitat, depth of habitat cannot be determined from video. <br /> - Although nursery habitats can be identified from the video imagery, it is not a useful <br />predictor of year class strength because habitat availability is not a good predictor of <br /> year class strength. <br /> - This analysis showed that the total habitat area available in 1963 at base flow was <br /> similar, but less than the area of available habitat found during the 2-year study period. <br /> The overall contribution of different geomorphic features to habitat availability has <br /> changed little since dam regulation. <br />1) Compare intensive sampling data and the concept of habitat utilization to standardized <br />monitoring data to assess a) ways of refining standardized monitoring procedures and b) <br />ways of making greater use of the data currently being collected. <br />- ISMP protocol calls for sam lin backwaters with minimum surface area of 30 m2 and <br />P g <br />minimum depth of 0.3 m. This depth is nearly identical to the mean depth (0.33 m) for <br />backwaters in which Colorado pikeminnow were collected at Ouray. The ISMP <br />minimum area is much lower than the mean for Colorado pikeminnow backwaters at <br />Ouray NWR (992 m2). However, Colorado pikeminnow were caught in backwaters as <br />small as 19 mZ. <br />1 Colorado pikeminnow were shown to prefer the type of habitats which the standardized <br />monitoring program (ISMP) specifies should be sampled, although other habitats are <br />also used. <br />- In Mineral Bottom, catch rates of the intensive sampling and catch rates of the ISMP <br />sampling were highly correlated. <br />xviii <br />fl <br />