Effects of brooding and broadcasting reproductive modes on the population genetic structure of two Antarctic gastropod molluscs |
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Authors: | J I Hoffman A Clarke K Linse L S Peck |
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Institution: | (1) Department of Animal Behaviour, University of Bielefeld, Postfach 100131, 33501 Bielefeld, Germany;(2) British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge, CB3 0ET, UK |
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Abstract: | Life-history characteristics exert a profound influence upon the population structure of many marine organisms. However, relatively
few genetic studies have compared direct with indirect-developing species in the same ecosystem or geographical region, and
none to our knowledge within an Antarctic setting. To address this issue, we have collected novel amplified fragment length
polymorphism (AFLP) data from the direct-developing top shell Margarella antarctica to form a comparison with previously published data for the broadcast-spawning Antarctic limpet Nacella concinna. We scored 270 loci in 240 M. antarctica individuals sampled from five populations spanning the full length of the Antarctic Peninsula. Profound differences were
identified in the strength and pattern of population structure between the two species, consistent with gene flow being highly
restricted in M. antarctica relative to N. concinna. |
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