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Aquatic Biota of Bank Stabilization Structures on the Missouri River, North Dakota

出版	The Station, 1982
URL	http://books.google.com.hk/books?id=8jTGNwAACAAJ&hl=&source=gbs_api

註釋Biological and physical data were collected from nine habitats on the Missouri River near Washburn, North Dakota. Sampling was conducted from mid-July to mid-October 1979 to compare the relative values of the habitats for fish and macroinvertebrates. Benthic samples included 11 families, among which oligochaetes (63 percent) and dipterans (34 percent) were numerically dominant. About half of the 166 samples taken at both structured and natural locations contained organisms, but 55 samples taken from mud or mud-fine sand substrates yielded 93 percent of the organisms collected. Although the numbers of taxa per station were not significantly different, there were significant differences in the mean numbers of organisms per station. Densities were greatest at two locations that included extensive areas of backwater (L-head dikes at Location DFH and wing dikes at Location DFW), and least at a revetted location (RVD) where the substrate was largely fine sand.