The influence of rock surface area on the microdistribution and sampling of attached riffle dwelling Trichoptera in Hartley Creek, Alberta
- 1 October 1983
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Zoology
- Vol. 61 (10), 2300-2304
- https://doi.org/10.1139/z83-302
Abstract
As the total rock surface area per unit area of stream bed differed significantly between riffles, comparisons between riffles for some species of Trichoptera could only be made in terms of numbers per unit rock area surface area rather than the conventional numbers per unit area of stream bed. The variance – mean density relationships of nine species of Trichoptera were constant on different sizes of rocks and from samples taken with a cylinder sampler in riffles of a brown-water stream. The number of individuals per rock was significantly greater on large rocks (surface area > 200 cm2) compared with intermediate and small rocks (40–200 cm2). The numbers of individuals per rock of Hydropsyche simulans and Glossosoma velona were greater on algae-covered rocks, whereas the numbers of Cheumatopsyche sp., Lepidostoma pluviale, and Micrasema sp. were greater on moss-covered rocks.Keywords
This publication has 3 references indexed in Scilit:
- The Role of Substratum in Benthic Macroinvertebrate Microdistribution and Litter Decomposition in a Woodland StreamEcology, 1980
- Factors Facilitating the Coexistence of Hydropsychid Caddis Larvae (Trichoptera) in the Same River SystemJournal of Animal Ecology, 1979
- The effect of rock size upon the distribution of species of Orthocladiinae (Chironomidae: Diptera) and Baetis intercalaris McDunnough (Baetidae: Ephemeroptera)Ecological Entomology, 1979