Assessing the efficacy of different sampling methods and determining length-mass relationships for wetland invertebrates
Henke, Jennifer A.
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Various samplers originally designed for sampling macroinvertebrates in aquatic ecosystems have been modified for use in wetlands with moderate success. Smaller, quantitative samplers often do not capture rare and mobile organisms whereas larger, qualitative samplers do not allow for density estimates. Sorting time is another important variable in deciding sampling regimes. This study examines the efficacy of four invertebrate samplers in three different wetlands. The Hess sampler was found to be the most effective with high invertebrate taxa diversity and among the highest densities. Although the Hess also required the most time to sort, subsampling can be used and the diversity and density can be kept. The sweep net was most effective for determining diversity, but abundance values should be expressed per unit sample, not per area. Two length-mass regressions previously uncalculated are provided for Pachydiplax longipennis and a Trichocorixa species.