Factors Affecting Microdistribution of Stream Benthic Insects

  • Rabeni C
  • Minshall G
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The microdistribution of stream insects in relation to current velocity, substratum particle size, silt, and detritus was studied in field experiments utilizing substratum-filled trays. 31% more organisms occurred in trays placed in a riffle than in those placed in a pool. In both riffle and pool the amount of colonization for most taxa was least on the smallest substratum sizes studied (0.5-0.7 cm diam.), was greater on the 1.0-2.0 cm size, reached a maximum on the 2.5-3.5 cm size, and was markedly reduced on the largest substratum size (4.5 × 7.0 cm). The reduction of current velocity alone accounted for reductions in the numbers of four or five species, while the addition of a light coating of silt (< 1 mm deep) significantly reduced the numbers of only three species. The 1.0-2.0 cm substratum trays consistently contained more small-sized (

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  • C. F. Rabeni

  • G. W. Minshall

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