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Genetic uniformity of widely separated populations of the coral reef starfishLinckia laevigata from the East Indian and West Pacific Oceans, revealed by allozyme electrophoresis

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Abstract

Gene flow among 18 widely separated populations of the starfishLinckia laevigata was investigated using allozyme electrophoresis at seven polymorphic enzyme loci. Little genetic differentiation was observed among East Indian-West Pacific populations separated by thousands of kilometres. Gene flow was estimated to be of the same order of magnitude as that found in the highly connected Great Barrier Reef region. The absence of genetic structure over such a broad geographic range is consistent with any of three conclusions: (1) there is extensive dispersal among widely separated populations across the range examined, (2) there has been a rapid expansion of the East Indian-West Pacific populations in the recent past, or (3) the loci surveyed are under the influence of balancing selection. The first two conclusions are not totally exclusive, since a recent expansion over several thousand generations would also require rapid dispersal at some stage, although present-day levels of dispersal need not be of the same order. With the available data, it is not possible to distinguish which of these mechanisms is the most likely. The most parsimonious conclusion is that extremely low levels of population differentiation are consistent with the existence of a large, homogeneous, panmictic population, with extensive dispersal occurring throughout the East Indian-West Pacific.

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Authors and Affiliations

  1. Australian Institute of Marine Science, PMB No. 3, 4810, Townsville, Queensland, Australia

    S. T. Williams & J. A. H. Benzie

  2. Zoology Department, James Cook University, 4811, Townsville, Queensland, Australia

    S. T. Williams

Authors
  1. S. T. Williams
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  2. J. A. H. Benzie
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Communicated by G. F. Humphrey, Sydney

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Williams, S.T., Benzie, J.A.H. Genetic uniformity of widely separated populations of the coral reef starfishLinckia laevigata from the East Indian and West Pacific Oceans, revealed by allozyme electrophoresis. Mar. Biol. 126, 99–107 (1996). https://doi.org/10.1007/BF00571381

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  • DOI: https://doi.org/10.1007/BF00571381

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