Abstract
For two years a community of larval chironomid midges was studied in a sandy-run portion of a fourth order natural stream in SE Ohio, U.S.A. in order to determine if the species partitioned the spatial resources. The habitat structure was simplified from ten habitat variables to three significant principal components. The three eigenvectors were easily interpreted as ‘sediment size’, ‘sediment heterogeneity’, and ‘organic deposition’. Species abundances were loaded on these axes and niche metrics examined. Strong differences in habitat preference were demonstrated for midge species on each component. Also, there were no differences in distributions for the intraspecific instars for each species tested at a given time, but for each of the instars tested, their distributions were found to change from time to time. Apparently, individuals of a species, regardless of instar, simultaneously choose the same habitat, however, the preferred habitat may shift temporally due to change in resource availability, or niche expansion or compression due to competition.
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Raei, J.G. A multivariate study of resource partitioning in soft bottom lotic Chironomidae. Hydrobiologia 126, 275–285 (1985). https://doi.org/10.1007/BF00007505
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DOI: https://doi.org/10.1007/BF00007505