COLONIZATION AND GROWTH OF ASCOPHYLLUM NODOSUM (PHAEOPHYTA) IN MAINE1

Authors

  • Milan Keser,

    1. Department of Botany and Plant Pathology, University of Maine, Orono, Maine 04473
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    • 2

      NU Environmental Laboratory, P.O. Box 128, waterford, CT 06385.

  • Bruce R. Larson

    1. Department of Botany and Plant Pathology, University of Maine, Orono, Maine 04473
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    • 3

      Marine Colloids Division, FMC Corporation, Rockland, ME 04841.


  • 1

    Accepted: 5 October 1983.

  • We are grateful to J. F. Foertch, R. T. Wilce, A. C. Mathieson and two Journal reviewers for their constructive criticism of the manuscript. We thank G. W. Johnson for drafting of figures and D. A. Audoin for typing.

ABSTRACT

Colonization and growth of Ascophyllum nodosum (L.) Le Jol. were investigated in two Maine estuaries from 1972 to 1978. Following denudation of intertidal rock, substrata were initially colonized by Fucus vesiculosus L.; eventually, Ascophyllum supplanted Fucus, and became dominant in terms of percentage cover. Ascophyllum settled first and most densely in the low intertidal zone, but its fastest growth occurred in the mid-intertidal zone. Some, but not all, Ascophyllum germlings produced a vesicle within one year of colonization. The mean annual growth of A. nodosum was variable among sites, zones and years.

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