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The cockle Cerastoderma edule at Northeast Atlantic shores: genetic signatures of glacial refugia
Krakau, M.; Jacobsen, S.; Jensen, K.T.; Reise, K. (2012). The cockle Cerastoderma edule at Northeast Atlantic shores: genetic signatures of glacial refugia. Mar. Biol. (Berl.) 159(1): 221-230. hdl.handle.net/10.1007/s00227-011-1802-8
In: Marine Biology. Springer: Heidelberg; Berlin. ISSN 0025-3162, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Krakau, M.
  • Jacobsen, S., more
  • Jensen, K.T.
  • Reise, K., more

Abstract
    The cockle Cerastoderma (Cardium) edule (L.) ranges from NW Africa to northern Scandinavia. Abundance in shallow coastal sediment is often high, and it attracts commercial harvest. In this study, a complex genetic pattern has been revealed by mitochondrial DNA in 383 individuals from 19 sampling sites. Parsimony network analysis of 79 haplotypes identified two dominant central haplotypes separated by low divergence. One is characteristic for a homogenous southwestern group of populations from Africa to the British Isles. The other is characteristic for a heterogeneous northern group with a deviant Arctic population. At the entrance of the Baltic Sea, a mixture zone of the dominant haplotypes was found. The estimated population expansion time for the northern haplotype group predates that of the southwestern one, suggesting northern glacial refugia and a subsequent southern expansion of C. edule populations.

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