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Genetic diversity and genetic structure in the brown alga Halidrys dioica (Fucales: Cystoseiraceae) in Southern California

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Abstract

Genetic diversity and genetic structure in a population of the brown seaweed Halidrys dioica Gardner were evaluated in five sites in southern California, USA, in 1991, using isozyme electrophoresis. H. dioica is relatively long-lived and has an outcrossing mating system and floating reproductive fronds with the potential for longdistance gamete dispersal. Because these characteristics are hypothetically important in determining genetic diversity and structure, we predicted that genetic diversity would be high and genetic structure would be exhibited only at relatively large geographic scales in H. dioica populations. The data were consistent with the prediction: genetic diversity (% polymorphic loci, no. of alleles/locus, average expected heterozygosity) was high compared to that of other seaweed species. Genetic structure (Wright's F statistics, Nei's genetic distance, point-pattern analysis of alleles) was low within and among distinct rocky reefs over 4 km of coast but high in subpopulations separated by 90 km. Life-history characteristics may be useful predictors of genetic diversity and structure in seaweed populations, but information on selection regimes, long-distance dispersal, and the extent of clonal propagation, for example, are critically lacking.

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Author notes

  1. S. L. Williams

    Present address: Department of Biology, San Diego State University, 92182-0057, San Diego, California, USA

Authors and Affiliations

  1. Department of Biology, San Diego State University, 92182-0057, San Diego, California, USA

    T. T. Lu

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  1. T. T. Lu
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  2. S. L. Williams
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Communicated by M. F. Strathmann, Friday Harbor

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Lu, T.T., Williams, S.L. Genetic diversity and genetic structure in the brown alga Halidrys dioica (Fucales: Cystoseiraceae) in Southern California. Marine Biology 121, 363–371 (1994). https://doi.org/10.1007/BF00346746

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  • DOI: https://doi.org/10.1007/BF00346746

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