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Phylogeography and demographic history of Atherina presbyter (Pisces: Atherinidae) in the North-eastern Atlantic based on mitochondrial DNA
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Resumo(s)
A fragment of the mitochondrial control region
was used to assess phylogeographic patterns and historical
demography of the sand-smelt Atherina presbyter in the
North-eastern Atlantic, covering its geographical range.
A striking result is the highly marked diVerentiation
between the Canary Islands population and western European
ones. A genetic structure among European populations
of A. presbyter was revealed, with a pattern of
isolation-by-distance or a gradient eVect at a scale of
hundreds kilometres, an uncommon pattern likely related to
the biological and life-history traits of the sand-smelt. The
northern European populations present a much lower
genetic diversity when compared to southern populations,
which is consistent with a recent colonization from southern
populations. The results showed signs of Pleistocene
signatures, with the population age estimates for the European
populations being clearly older than the Last Glacial
Maximum (18,000 years bp). Nevertheless, paleotemperature
reconstructions show that the sand-smelt could not
have inhabited the western European shores during the last
glacial phase.
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Citação
Marine Biology, 156, 1421-1432