Glacial refugium versus range limit: Conservation genetics of Macoma Balthica, a key species in the Bay of Biscay (France)

Abstract : The bivalve Macoma balthica (L.) is a key species of intertidal mudflats in France and Europe. Its natural range has experienced a contraction along the European coastline towards the northeast during the past five decades. This southern boundary shift seems to be correlated with the increased sea surface temperature in the Bay of Biscay (France), a major glacial refugium during the LGM (Last Glacial Maximum, 18000 years ago). In this study, we used one mitochondrial marker (COI) and eight nuclear microsatellite markers to reveal patterns consistent with populations that are close to a glacial refugium. Meridional populations exhibit high genetic diversity, contrary to what is expected from populations at the edge of a species range. In addition, we highlight a barrier to gene flow in the Bay of Biscay populations, near Brittany. So considering (i) the previously reported sensitivity of M. balthica to elevated temperatures, (ii) the genetic isolation of the southernmost populations, and (iii) the importance of this species in the trophic web, the population ecology and genetic structure of this species should be monitored in the context of global warming.
Document type :
Journal articles
Complete list of metadatas

Cited literature [47 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-00872186
Contributor : Eric Pante <>
Submitted on : Friday, October 11, 2013 - 1:52:13 PM
Last modification on : Friday, January 12, 2018 - 12:52:01 PM

File

JEMBE-D-11-00446R1_preprint.pd...
Files produced by the author(s)

Identifiers

Collections

Citation

Vanessa Becquet, Benoit Simon-Bouhet, Eric Pante, Herman Hummel, Pascale Garcia. Glacial refugium versus range limit: Conservation genetics of Macoma Balthica, a key species in the Bay of Biscay (France). Journal of Experimental Marine Biology and Ecology, Elsevier, 2012, 432-433, pp.73-82. ⟨10.1016/j.jembe.2012.07.008⟩. ⟨hal-00872186⟩

Share

Metrics

Record views

630

Files downloads

541