Size structure of the metazoan community in a Piedmont stream

LeRoy POFF, M.A. Palmer, P.L. Angermeier, R.L. Vadas Jr., C.C. Hakenkamp, A. Bely, P. Arensburger, A.P. Martin

    Research output: Contribution to journalArticle

    59 Citations (Scopus)

    Abstract

    We characterized the size structure of virtually the entire metazoan community in a fourth order, sandybottomed Piedmont stream during late summer. Our study, the first to sample across all habitat types and sizes of metazoans in an aquatic ecosystem, indicates that at the community level, stream size spectra may be bimodal for the benthos or trimodal when fish are included. Animals spanning 10 orders of magnitude in dry mass (from gastrotrichs to fish) were quantitatively collected from nine habitat types. The bimodal benthic size spectrum was characterized by a meiofaunal component (mostly oligochaetes and micro-crustacea) and a macrobenthic component (mostly the introduced asiatic clam, Corbicula fluminea). Insects contributed little to overall standing crop. Size-specific contribution to whole-community metabolism was assessed using allometric equations for respiration, and we found a distinctly bimodal distribution across the entire metazoan size range, with peaks in the meiofaunal and benthic macrofaunal size ranges. Our bimodal benthic size spectrum is similar to that observed for marine benthos but not to other freshwater benthic systems, possibly because the entire range of habitat types and/or animal sizes were not sampled in the latter. Numerous factors may influence size spectra in stream ecosystems, including local geomorphic (habitat) conditions, water level fluctuations, species introductions, and predation processes.
    Original languageUndefined
    Pages (from-to)202-209
    Number of pages8
    JournalOecologia
    Volume95
    Issue number2
    DOIs
    Publication statusPublished - 1993

    Cite this

    POFF, L., Palmer, M. A., Angermeier, P. L., Vadas Jr., R. L., Hakenkamp, C. C., Bely, A., Arensburger, P., & Martin, A. P. (1993). Size structure of the metazoan community in a Piedmont stream. Oecologia, 95(2), 202-209. https://doi.org/10.1007/BF00323491