A carregar...
Publicação
Comparisons of the genetic structure of Squalius populations (Teleostei, Cyprinidae) from rivers with contrasting histories, drainage areas and climatic conditions based on two molecular markers
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 688.89 KB | Adobe PDF |
Orientador(es)
Resumo(s)
The genetic structure of Squalius populations from Portuguese Atlantic- and Mediterranean-type streams
(assigned to six distinct morphoclimatic regions) was compared using sequences of the cytb and betaactin
genes. The drainage area was significantly correlated to all the genetic diversity indices, pointing
to the need to control for this effect in comparing populations with different histories and paleoecologies.
A significant correlation was also found between genetic diversity and the morphoclimatic regions to
which the rivers were assigned, with the highest diversity in warmer, lower latitude, Mediterranean-type
streams. This relationship was not due to idiosyncratic characteristics of the clades compared. When the
drainage area and phylogenetic effects were removed, the southern Mediterranean streams harboured
significantly more genetic diversity even when compared with much larger northern streams. It is argued
that these results are likely caused both by the metapopulation structure of the Mediterranean streams
and by the severe reduction or local extinction of populations in the northern rivers during glaciations.
Descrição
Palavras-chave
Cyprinidae Mediterranean Iberian Peninsula Glacial refugia Metapopulations Freshwater fish
Contexto Educativo
Citação
Molecular Phylogenetics and Evolution, 57, 924-931
Editora
Elsevier