Population structure and genetic variation in two tropical sea anemones (Cnidaria,Actinidae) with different reproductive strategies |
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| Authors: | C A M Russo A M Solé-Cava J P Thorpe |
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| Institution: | (1) Departamento de Genética, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Bloco A, CCS, Gidade Universitária, Uha do Fundao, 21.941 Rio de Janeiro-RJ, Brazil;(2) Department of Environmental and Evolutionary Biology, The University of Liverpool, Port Erin Marine Laboratory, Port Erin, Isle of Man, UK |
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| Abstract: | Genetic variation and population structure of two tropical sea anemones, Bunodosoma caissarum Correa and Actinia bermudensis McMurrich were related to their different dispersal capabilities and reproductive modes. B. caissarum reproduces sexually and has a long-lived planktotrophic larva; A. bermudensis can reproduce both sexually and asexually, supposedly with short-range dispersal. Both species were sampled along 1150 km of Brazilian coastline between 1990 and 1991 and analyzed by horizontal starch gel electrophoresis for 16 enzyme loci in B. caissarum and 19 in A. bermudensis. B. caissarum had higher levels of heterozygosity (H=0.35) and lower levels of population structuring (F
ST=0.042) than A. bermudensis (H=0.17; F
ST=0.262). At one locality large genetic differences between two sympatric colour morphs of A. bermudensis provide evidence of possible cryptic speciation. Overall levels of genetic variation and heterozygosity in the two species are compatible with their known modes of reproduction. |
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