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- W2419355693 abstract "Sweep sampling is the quickest, least expensive, and most commonly used method of sampling rangeland grasshopper (Acrididae) com- munities to determine species composition. However, few studies have exam- ined the accuracy of sweep sampling relative to actual community composition because the latter is difficult to determine. We made such comparisons by sampling grasshoppers within enclosures that prevented their escape during sampling. We first took a single sweep sample within the enclosure, then exhaustively sampled the enclosure to remove all remaining grasshoppers. Comparison of the grasshoppers in the initial sample to those remaining in the enclosure was used to test the hypothesis that an accurate estimate of com- munity composition was provided by the initial sweep sample. We sampled during a 5-wk period to determine if accuracy changed seasonally and swept in both mowed and unmowed enclosures to relate the results to the physical structure of the vegetation. The initial sweep samples, which are equivalent to the single samples taken in many studies, provided good estimates of the relative abundance of most species. Mean differences between estimated and actual proportions of particular species were generally less than 0.03. Even though the deviations were usually relatively small, the relative abundances of some species were sometimes underestimated or overestimated in the samples. In particular, Phoetaliotes nebrascensis (Thomas) was sometimes overesti- mated to such an extent that it caused other species to be underestimated. Our results suggest that correction factors could be developed to adjust sweep sample estimates to account for consistent biases in sampling, but this correc- tion would have to be done on a community-by-community and habitat-by- habitat basis." @default.
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- W2419355693 date "1999-07-01" @default.
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- W2419355693 title "Evaluation of the Accuracy of Sweep Sampling in Determining Grasshopper (Orthoptera: Acrididae) Community Composition 1" @default.
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