Influence of stream sediments on distribution of macrobenthos
Keywords:
Ephemeroptera, Plecoptera, Trichoptera, DipteraAbstract
Studies were conducted in the laboratory and field to determine the substrate relationships of five species of stream insects representing the orders Ephemeroptera, Plecoptera, Trichoptera and Diptera. Various combinations of pebble and sand were tested in the presence or absence of cobbles. Substrates with cobble were generally preferred over substrates without cobble. The preference for cobble generally increased as the sediments around the cobble decreased in size. Substrates with unembedded cobble were slightly preferred over half-embedded cobble: completely embedded cobble in fine sand proved unacceptable to most species. Three types of substrate-distribution patterns are recognized: stream insects which inhabit substrate surfaces: interstices: and both substrate surfaces and interstices.References
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