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Sediment grain size effect on benthic microalgal biomass in shallow aquatic ecosystems

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Abstract

Benthic microalgal biomass is an important fraction of the primary producer community in shallow water ecosystems, and the factors controlling benthic microalgal biomass are complex. One possible controlling factor is sediment grain-size distribution. Benthic microalgal biomass was sampled in sediments collected from two sets of North Carolina estuaries Massachusetts and Cape Cod bays, and Manukau Harbour in New Zealand. Comparisons of benthic microalgal biomass and sediment grain-size distributions in these coastal and estuarine ecosystems frequently showed a negative relationship between the proportion of fine-grained sediments and benthic microalgal biomass measured as chlorophylla. The highest sedimentary chlorophylla levels generally occurred in sediments with lower percentages of fine particles (diameter <125 mm). A negative relationship between the proportion of fine sediments and benthic microalgal biomass suggests anthropogenic loadings of fine sediment may reduce the biological productivity of shallow-water ecosystems.

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Source of Unpublished Material

  • Laws, R. personal communication, Department of Earth Sciences, University of North Carolina at Wilmington, Wilmington, North Carolina.

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Authors and Affiliations

  1. Department of Biological Sciences, University of North Carolina at Wilmington, 28403, Wilmington, North Carolina

    L. B. Cahoon & J. E. Nearhoof

  2. College of Ocean and Atmospheric Sciences, Oregon State University, 97331-5503, Corvallis, Oregon

    C. L. Tilton

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  1. L. B. Cahoon
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  2. J. E. Nearhoof
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  3. C. L. Tilton
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Correspondence to L. B. Cahoon.

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Cahoon, L.B., Nearhoof, J.E. & Tilton, C.L. Sediment grain size effect on benthic microalgal biomass in shallow aquatic ecosystems. Estuaries 22, 735–741 (1999). https://doi.org/10.2307/1353106

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  • DOI: https://doi.org/10.2307/1353106

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