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Aquatic Invertebrate Community Structure In The Niobrara River, Agate Fossil Beds National Monument, Nebraska, 1996-2009, David E. Bowles, David G. Peitz, J. Tyler Cribbs
Aquatic Invertebrate Community Structure In The Niobrara River, Agate Fossil Beds National Monument, Nebraska, 1996-2009, David E. Bowles, David G. Peitz, J. Tyler Cribbs
Great Plains Research: A Journal of Natural and Social Sciences
Aquatic invertebrates were sampled annually in the Niobrara River, Nebraska, during the period 1996-2009 using Hester-Dendy multiplate samplers. Collections indicated the invertebrate community in the river has shifted from one dominated by Ephemeroptera, Plecoptera, and Trichoptera (EPT) taxa to one dominated by Chironomidae and Amphipoda. Generally, EPT richness and percentage abundance of EPT of the total community, as well as percentage abundance of Heptageniidae and Leptophlebiidae, has declined across the years. During that same period, percentage abundance of Amphipoda and Chironomidae, taxa evenness, Shannon's Index, and the Hilsenhoff Biotic Index have increased. Stream discharge decreased significantly during the 15-year period …