Restricted gene flow in Chilean barnacles reflects an oceanographic and biogeographic transition zone

Broad scale patterns of genetic structure in coastal communities are strongly affected by both ecological transitions and larval dispersal. Along the Chilean coast, we examined 2 species of co-distributed barnacles,Jehlius cirratusandNotochthamalus scabrosus, which span an ecological transition asso...

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Bibliographic Details
Published in:Marine ecology. Progress series (Halstenbek) 2009-11, Vol.394, p.165-177
Main Authors: Zakas, C., Binford, J., Navarrete, S. A., Wares, J. P.
Format: Article
Language:English
Subjects:
Coastal ecology
Coasts
Ecological genetics
Evolutionary genetics
Gene flow
Genetic loci
Haplotypes
Jehlius cirratus
Larvae
Marine
Oceanography
Species
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Summary:Broad scale patterns of genetic structure in coastal communities are strongly affected by both ecological transitions and larval dispersal. Along the Chilean coast, we examined 2 species of co-distributed barnacles,Jehlius cirratusandNotochthamalus scabrosus, which span an ecological transition associated with a sharp increase in larval recruitment. A distinct break in haplotype frequencies in the mitochondrial cytochrome oxidase I (mtCOI) gene was detected inN. scabrosus, with only marginal genetic structure observed inJ. cirratus, suggesting significant differences in either selective pressures or dispersal ability between the species. The nuclear gene elongation factor 1α was also analyzed inN. scabrosus, and similarly suggested limited gene flow. The sharp genetic transition is downstream of the described ecological transition, effectively mirroring a genetic cline described in a different barnacle species along the North American Pacific coast.
ISSN:0171-8630
1616-1599
DOI:10.3354/meps08265