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MEPS
Marine Ecology Progress Series

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MEPS 394:165-177 (2009)  -  DOI: https://doi.org/10.3354/meps08265

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

C. Zakas1, J. Binford2, S. A. Navarrete3, J. P. Wares1,*

1Department of Genetics, University of Georgia, Athens, Georgia 30602, USA
2Yale University School of Medicine, New Haven, Connecticut 06510, USA
3Estación Costera de Investigaciones Marinas & Center for Advanced Studies in Ecology and Biodiversity, Pontificia Universidad Católica de Chile, Santiago, Chile
*Corresponding author. Email:

ABSTRACT: 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 cirratus and Notochthamalus 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 in N. scabrosus, with only marginal genetic structure observed in J. cirratus, suggesting significant differences in either selective pressures or dispersal ability between the species. The nuclear gene elongation factor 1α was also analyzed in N. 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.


KEY WORDS: Phylogeography · Oceanography · Intertidal · Chile · Barnacle · Upwelling · Recruitment


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Cite this article as: Zakas C, Binford J, Navarrete SA, Wares JP (2009) Restricted gene flow in Chilean barnacles reflects an oceanographic and biogeographic transition zone. Mar Ecol Prog Ser 394:165-177. https://doi.org/10.3354/meps08265

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