. Fish populations of the wild & scenic Missouri River, Montana . Fishing surveys; Wild and scenic rivers; Fishes; Fishes. Figure 8. Diversity of the aquatic macroinvertebrate community was least at Morony Dam and greatest at Judith Landing and Robinson Bridge. community. Baetis, chironomids, and Hydropsyche were the predominant macroinvertebrate taxacollected at the Morony Dam site. As an average for all sampling dates combined, these taxa accounted for 83 percent of the macroinvertebrates collected at the Morony Dam site. In contrast, these taxa accounted for only 47 percent of the macro
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. Fish populations of the wild & scenic Missouri River, Montana . Fishing surveys; Wild and scenic rivers; Fishes; Fishes. Figure 8. Diversity of the aquatic macroinvertebrate community was least at Morony Dam and greatest at Judith Landing and Robinson Bridge. community. Baetis, chironomids, and Hydropsyche were the predominant macroinvertebrate taxacollected at the Morony Dam site. As an average for all sampling dates combined, these taxa accounted for 83 percent of the macroinvertebrates collected at the Morony Dam site. In contrast, these taxa accounted for only 47 percent of the macroinvertebrates collected at the downstream sites. Baetis, chironomids, and Hydropsyohe^ because of their great variety of species, are generally con- sidered very adaptable to wide changes in the normal physical and chemical conditions in a lotic system (Merritt and Cummins 1978). Stoneflies, which have a narrower environmental tolerance, were essentially absent from the Morony Dam site, and mayflies were found only in limited numbers. Although the aquatic macroinvertebrate community at the Morony Dam site was not as diverse as the downstream sites, the relative abundance of macroinvertebrates appeared to be similar to the downstream sites. With a few important differences, the aquatic macroinvertebrate community of this Missouri River study area exhibited a striking resemblance to that of the Yellowstone River between Huntley and Glendive (Schwehr 1977). Con- sidering the mayflies, stoneflies, and caddisflies only, both rivers contained a diverse mayfly taxa in contrast to a rather limited diversity of stonefly and caddisfly taxa. The mayfly diversity was slightly higher on the Yellow- stone River, while stoneflies and caddisflies were slightly more diverse on the Missouri. Dominant subordinal taxa were essentially the same in both 39. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appe