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Journal Molluscan Studies Advance Access originally published online on April 28, 2009
Journal of Molluscan Studies 2009 75(3):207-214; doi:10.1093/mollus/eyp016
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© The Author 2009. Published by Oxford University Press on behalf of The Malacological Society of London, all rights reserved

Maintenance of parental populations bordering a blue mussel hybrid zone by post-settlement selection

Matthew R. Gilg1, Melissa O'Connor1, Ryan Norris1 and Thomas J. Hilbish2

1Department of Biology, University of North Florida, 1 UNF Drive, Jacksonville, FL 32224, USA; and 2Department of Biology, University of South Carolina, Columbia, SC 29208, USA

Correspondence: M.R. Gilg; e-mail: mgilg{at}unf.edu


  Abstract

A common question in studies of hybrid zones regards how nearby parental populations can remain distinct in the face of gene flow from the other species and hybrid populations. Environmentally dependent hybrid-zone models often invoke selection favouring each of the parental species in different habitats where immigrants will often fail to survive and reproduce. The present study tests whether a relatively pure population of Mytilus galloprovincialis, located on the edge of a hybrid zone with M. edulis, is being maintained by selection against hybrid immigrants. Comparisons of newly settled spat with members of the same cohort approximately 9 months later consistently show a reduction in M. edulis-specific alleles to levels observed in adult age classes at two diagnostic loci. These data provide evidence for selection against spat from the hybrid zone that settled at sites within the M. galloprovincialis population within the first year of life. The observed selection would result in removal of most M. edulis-specific alleles prior to reproduction and keep the M. galloprovincialis population distinct.

(Received 21 April 2008; accepted 14 September 2008)


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