Oxygen, organic matter, and sediment granulometry as controls on hyporheic animal communities

摘要: We hypothesized that dissolved oxygen, sediment granulometry, and organic content jointly limit hyporheic animal communities. To test this hypothesis, we took 167 samples of invertebrates at 14 sites in the eastern United States with a Bou-Rouch pump (100 μm mesh net) measured grain size content, other chemical variables these sites. Invertebrate communities were dense (almost 600 animals per 3-L sample) typically dominated by copepods, nematodes, annelids. Nonetheless, many groups encountered regularly, both density community composition varied widely across Many invertebrate taxa found infrequently where oxygen concentrations low or was small. Further, higher than 1 mg/L, densities positively correlated content. In addition, most abundant coarse sediments. These results support our hypothesis. Nevertheless, correlations observed weak, suggesting factors also are important regulating