The phylogeographic pattern of vairone (Telestes muticellus) populations was assessed to test the biogeographic distinction of three peri-Mediterranean ichthyogeographic districts: Padano-Venetian (PV), Tuscano-Latium (TL) and Southern France (SF), evaluating the role of Alpine and Apennine barriers in shaping distinct evolutionary lineages. A fragment of mitochondrial DNA cytochrome b was sequenced in 153 specimens from 14 northwestern Italian populations, collected in 10 tributaries of Po River and in 4 rivers on the Tyrrhenian slope of Ligury. 32 haplotypes were identified. The phylogenetic analyses confirmed the presence of two distinct clades, an “Italian clade” (T. muticellus) and a “French clade” (T. souffia), showing an average genetic distance of 12.9 % (±1.3 SD) and allopatric distribution. The NCA and AMOVA analyses revealed an isolated gene pool in eastern basins on the Tyrrhenian slope of Ligury. The phylogeographic findings suggest: i) the lack of permeability of Alpine barrier towards the dispersion across Italian and French hydrographical systems, ii) partial permeability of Mediterranean Alps and Apennines through river captures crossing lower watersheds.
Phylogeographic structure of vairone Telestes muticellus (Teleostei, Cyprinidae) within three European peri-Mediterranean districts.
ZACCARA, SERENA;
2007-01-01
Abstract
The phylogeographic pattern of vairone (Telestes muticellus) populations was assessed to test the biogeographic distinction of three peri-Mediterranean ichthyogeographic districts: Padano-Venetian (PV), Tuscano-Latium (TL) and Southern France (SF), evaluating the role of Alpine and Apennine barriers in shaping distinct evolutionary lineages. A fragment of mitochondrial DNA cytochrome b was sequenced in 153 specimens from 14 northwestern Italian populations, collected in 10 tributaries of Po River and in 4 rivers on the Tyrrhenian slope of Ligury. 32 haplotypes were identified. The phylogenetic analyses confirmed the presence of two distinct clades, an “Italian clade” (T. muticellus) and a “French clade” (T. souffia), showing an average genetic distance of 12.9 % (±1.3 SD) and allopatric distribution. The NCA and AMOVA analyses revealed an isolated gene pool in eastern basins on the Tyrrhenian slope of Ligury. The phylogeographic findings suggest: i) the lack of permeability of Alpine barrier towards the dispersion across Italian and French hydrographical systems, ii) partial permeability of Mediterranean Alps and Apennines through river captures crossing lower watersheds.
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