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The influence of microhabitat on availability of drifting invertebrate prey to a net‐spinning caddisfly
Author(s) -
SMITHCUFFNEY FRANCIE L.,
WALLACE J. BRUCE
Publication year - 1987
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.1987.tb01031.x
Subject(s) - riffle , caddisfly , hydropsychidae , invertebrate , streams , environmental science , predation , hydrology (agriculture) , ecology , sediment , baetidae , range (aeronautics) , habitat , biology , geology , larva , computer network , paleontology , materials science , geotechnical engineering , computer science , composite material
SUMMARY. 1. Invertebrate drift was sampled at both a rockface and a deep pebble riffle site in streams draining both a clearcut and a forested catchment. 2. A sampler was designed to separate the bottom 2 cm of flow, encompassing the effective range of caddisfly (Hydropsychidae: Trichoptera) catchnets. from upper flow. 3. No significant difference in drift density (numbers per cubie metre) was seen between sites within each stream. However, numbers per square centimetre intake area per day at the rockface sites were 4 times higher in the clearcut and 10 times higher in the forested stream than at the pebble‐riffle site. 4. Rockface habitat which had highest drift availability was also the site of maximum secondary production of the predaceous collector‐ filterer Parapsyche cardis in both streams studied. 5. Increased sediment load in the clearcut stream may influence the efficiency of utilization of invertebrate drift by collector‐filterers.