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Benthic meiofauna assemblage structure of headwater streams: density and distribution of taxa relative to substrate size

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Abstract

Permanent meiofauna taxa and portions of the population of other invertebrates that are temporarily in the meiofauna size class are often precluded from stream studies and assessments. This study was designed to determine the identity, density, and distribution of major meiofauna taxa relative to substrate size in a set of similar headwater streams. Using a coring technique, meiofauna (80 μm–1 mm) and substrate samples were collected from 11 Ozark headwater streams in the Boston Mountain ecoregion of Arkansas, USA. Mean meiofauna density among streams was 1739 ± 436 organisms per l. Permanent meiofauna taxa (Copepoda, Cladocera, Ostracoda, Rotifera, Nematoda, Hydrachnida, and Tardigrada) comprised 22.5% of the organisms collected with a mean density of 394 ± 233 organisms per l; temporary meiofauna taxa (Oligochaeta, Turbellaria, Hydroidea, Chironomidae, Ephemeroptera, and other insects) comprised the remainder with a density of 1346 ± 308 organisms per l. Chironomidae was the most numerous temporary meiofauna taxon, and Hydrachnida was the most numerous permanent taxon. Streams were found to differ significantly in substrate composition and densities of major taxonomic categories. Substrate size was found to predict densities for most of these taxonomic categories. Meiofauna patchiness was reflected in high variability within streams. Canonical correspondence analysis revealed positive associations between Copepoda and Nematoda and silt, and between Copepoda, Nematoda, and Rotifera and fine sand. Hydrachnida and Rotifera were negatively associated with silt and coarse sand, respectively. The potential value of inclusion of meiofauna in stream environmental assessments is discussed.

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Acknowledgements

The time and energy of numerous people who assisted with collecting field data including Jan Hinsey, Terri Phelan, Robin Reese, and Paul Justus is genuinely appreciated. We wish to acknowledge Dr. Edward Gbur’s assistance and review of the statistical analyses of our research.

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  1. Department of Biological Sciences, University of Arkansas, Sci-Eng Room 601, Fayetteville, AR, 72701, USA

    Andrea J. Radwell & Arthur V. Brown

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  1. Andrea J. Radwell
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  2. Arthur V. Brown
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Correspondence to Andrea J. Radwell.

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Radwell, A.J., Brown, A.V. Benthic meiofauna assemblage structure of headwater streams: density and distribution of taxa relative to substrate size. Aquat Ecol 42, 405–414 (2008). https://doi.org/10.1007/s10452-007-9108-0

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