Interspecific differentiation and intraspecific substructure in two closely related clupeids with extensive hybridization, Alosa alosa and Alosa fallax - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Fish Biology Année : 2006

Interspecific differentiation and intraspecific substructure in two closely related clupeids with extensive hybridization, Alosa alosa and Alosa fallax

Résumé

In this study, the evolutionary relationships within and among populations of European shads, Alosa alosa and Alosa fallax, was investigated. Screening of allelic variation across eight allozyme loci and sequencing 448 bp of the mtDNA cytochrome b gene in 14 rivers throughout the range of the species supported that the two taxa were independent lineages (1·3% net nucleotide divergence) despite extensive hybridization. Genetic diversity and structure was considerably higher in A. fallax than A. alosa and the former species revealed evidence of distinct lineages in the Mediterranean and Atlantic basins. A Bayesian clustering approach combined with gill raker counts verified that individuals of the two species could be assigned to their parent group with relatively high confidence. Evaluation of hybridization in the Lima and Mondego Rivers in Portugal provided evidence that introgression is extensive but is not currently obscuring (through hybrid swarming) the diagnosability of the two species.

Dates et versions

hal-01453704 , version 1 (02-02-2017)

Identifiants

Citer

P. Alexandrino, R. Faria, D. Linhares, F. Castro, Matthieu Le Corre, et al.. Interspecific differentiation and intraspecific substructure in two closely related clupeids with extensive hybridization, Alosa alosa and Alosa fallax. Journal of Fish Biology, 2006, 69, pp.242-259. ⟨10.1111/j.1095-8649.2006.01289.x⟩. ⟨hal-01453704⟩
58 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More