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Contrasts in genetic structure and historical demography of marine and riverine populations of Atherina at similar geographical scales
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Orientador(es)
Resumo(s)
In this paper, we compare the genetic structure and the historical demography of two populations of the sand smelt Atherina boyeri from the
rivers Tagus and Mondego (Portugal) with two groups of samples of the closely related marine Atherina presbyter collected on the shore at
comparable latitudes. A. presbyter is a pelagic marine inshore fish, while A. boyeri is typically found in coastal lagoons, estuaries and freshwaters
bodies. Analysis of mtDNA control region sequences showed that the marine A. presbyter did not display signs of genetic differentiation between
sites some hundreds of kilometers apart. On the contrary, A. boyeri showed clear differences between populations. The populations of A. boyeri
showed a much lower genetic diversity and younger coalescence times when compared with A. presbyter. We suggest that these differences
reflect the interplay between differences in ecology between the two species and the historical impact of the glaciations. While A. presbyter
likely moved to the south evading the cold periods, A. boyeri probably went extinct and its populations in Western Europe are recent recolonizations
from western Mediterranean refugia.
Descrição
Palavras-chave
Atherina presbyter Atherina boyeri Sand smelt Control region Portugal Population structure
Contexto Educativo
Citação
Estuarine, Coastal and Shelf Science, 69, 655-661