Macroinvertebrates were collected from the Missouri River downstream of Fort Randall and Gavins Point dams to evaluate spatial and temporal patterns in abundance and describe habitats important for macroinvertebrates. The most abundant families collected were Chironomidae, Ceratopogonidae, Isonychiidae, Baetidae, Caenidae, Heptageniidae, Hydropsychidae, and Polycentropodidae. Invertebrate abundance, richness, diversity, and evenness were generally higher in the Gavins Point reach than in the Fort Randall reach for most gear types (except Surber samples). In the Fort Randall reach, mean richness, diversity, and evenness were generally highest in the delta formed downstream of the Niobrara River.
We collected 31 juvenile pallid sturgeon during summer 2006 for diet analysis, of which 21 had prey in their stomachs. Percent occurrence of predominant prey was Ceratopogonidae (81%), Isonychiidae (67%), Chironomidae (52%), and fish (24%). Diets as percent composition by wet weight were fish (68%), Ephemeroptera (23%), Decapoda (6%), and Diptera (3%). As juvenile pallid sturgeon length increased (356–720 mm fork length), the proportion of fish in the diets increased (43 to 88%). This study showed the importance of macroinvertebrates as a food source for juvenile pallid sturgeon (<600 mm fork length).
|Advisor:||Klumb, Robert A., Chipps, Steven R.|
|School:||South Dakota State University|
|School Location:||United States -- South Dakota|
|Source:||MAI 48/04M, Masters Abstracts International|
|Subjects:||Ecology, Entomology, Aquatic sciences|
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