Comparing strengths of geographic and nongeographic classifications of stream benthic macroinvertebrates in the Mid-Atlantic Highlands, USA
作者： Ian R. Waite , Alan T. Herlihy , David P. Larsen , Donald J. Klemm
DOI: 10.2307/1468105
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摘要: AbstractThe US Environmental Protection Agency’s (USEPA) Monitoring and Assessment Program (EMAP) sampled ∼500 wadeable streams in the Mid-Atlantic Highlands region of during late spring 1993 to 1995 for a variety physical, chemical, biological indicators environmental condition. Eighty-eight sites that were minimally affected by human activities chosen determine extent which geographic stream-based classifications accounted variation composition riffle macroinvertebrate assemblages. Bray–Curtis similarities among calculated from relative abundance macroinvertebrates assess strength based on geography (ecoregions catchments), habitat (slope stream order), water chemistry (conductivity). For comparison, taxonomic classification (two-way indicator species analysis, TWINSPAN) gradient analysis (correspondence CA) performed data. To asse...
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