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Article Dans Une Revue Marine Biology Année : 2014

Genetic structure in native and non-native populations of the direct-developing gastropod Crepidula convexa

Résumé

In many marine invertebrate species, larval development plays an important role in population connectivity and gene flow: species with direct benthic development generally show more genetic structure than those with planktonic development. We used nuclear markers (microsatellites) to determine population genetic structure of the direct-developing snail Crepidula convexa (Gastropoda: Calyptraeidae) in seven populations with 15-85 individuals each within its native range of the northwest Atlantic and compared it to Crepidula fornicata, a congener with planktonic development. Our results are consistent with general expectations and previous work in these species with other markers: C. convexa had greater population structure and even at a regional scale shows significant isolation-by-distance, in contrast to C. fornicata. We also genotyped a single population of C. convexa introduced to the northeastern Pacific to investigate the prediction of reduced genetic diversity following introduction (founder effect). We did not find a reduction in genetic diversity, suggesting that this non-native population may be characterized by multiple introductions. This pattern is consistent with many other introduced populations of marine invertebrates, including C. fornicata.
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Dates et versions

hal-01218818 , version 1 (21-10-2015)

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Abigail E. Cahill, Frédérique Viard. Genetic structure in native and non-native populations of the direct-developing gastropod Crepidula convexa. Marine Biology, 2014, 161 (10), pp.2433-2443. ⟨10.1007/s00227-014-2519-2⟩. ⟨hal-01218818⟩
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