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Atypical panmixia in a European dolphin species (Delphinus delphis): implications for the evolution of diversity across oceanic boundaries

Moura, Andre and Natoli, A. and Rogan, E. and Hoelzel, A. R. (2013) Atypical panmixia in a European dolphin species (Delphinus delphis): implications for the evolution of diversity across oceanic boundaries. Journal of Evolutionary Biology, 26 (1). pp. 63-75. ISSN 1010-061X

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Despite the scarcity of geographical barriers in the ocean environment, delphinid cetaceans often exhibit marked patterns of population structure on a regional scale. The European coastline is a prime example, with species
exhibiting population structure across well-defined environmental boundaries. Here we undertake a comprehensive population genetic study on the European common dolphin (Delphinus delphis, based on 492 samples and 15
loci) and establish that this species shows exceptional panmixia across most of the study range. We found differentiation only between the eastern and western Mediterranean, consistent with earlier studies, and here use
approximate Bayesian computations to explore different scenarios to explain the observed pattern. Our results suggest that a recent population bottleneck likely contributed significantly to the differentiation of the Eastern Mediterranean population (in Greek waters). This interpretation is consistent with independent census data that suggest a sharp population decline in therecent past. The implication is that an unperturbed population may currently
show panmixia across the full study range. This exception to the more typical pattern of population structure seen for other regional dolphin species (and for common dolphin populations elsewhere in the world) suggests particular ecological or life-history traits distinct to this species in European waters.

Additional Information:Article first published online: 3 December 2012
Keywords:bottleneck, common dolphin, microsatellites, population structure
Subjects:C Biological Sciences > C180 Ecology
C Biological Sciences > C182 Evolution
C Biological Sciences > C181 Biodiversity
Divisions:College of Science > School of Life Sciences
ID Code:13962
Deposited On:21 May 2014 14:59

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