Evolution of freshwater crab diversity in the Aegean region (Crustacea: Brachyura: Potamidae).
Mol Phylogenet Evol
; 59(1): 23-33, 2011 Apr.
Article
in En
| MEDLINE
| ID: mdl-21216297
ABSTRACT
The aim of this study was to estimate the influence of the palaeogeographic and climatic history of the Aegean region on the diversity of freshwater crabs of the genus Potamon and to test whether this area served as source or reservoir in species diversity. Necessary species delimitation was accomplished by phylogenetic analyses of the mitochondrial markers COX1 and ND1, partial 16S rRNA gene and the tRNALeu gene. We found 14 genetic lineages of which nine could be assigned to previously recognised species. Temporal estimates of the splitting pattern in the phylogeny of Potamon indicated that a combination of geological and climatic events influenced their diversification. Within Potamon, the lineages separated into a western group and an eastern group. This first split in the genus occurred approximately 8.3-5.5 Mya, thus possibly correlated with the Messinian salinity crisis. A likelihood approach to geographic range evolution suggested for most species, occurring in the Aegean area, an origin in the Middle East. Moreover, there were no insular endemics in the central Aegean archipelago, therefore low sea-levels during the Pleistocene glacial periods possibly enabled dispersal to these islands, but subsequent rise in sea-level did not cause speciation. Nevertheless, the diversification of most lineages occurred during the Pleistocene epoch thus coinciding with Quaternary fluctuations of the climate.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Genetic Variation
/
Brachyura
/
Biological Evolution
/
Fresh Water
Type of study:
Prognostic_studies
Limits:
Animals
Country/Region as subject:
Africa
/
Asia
/
Europa
Language:
En
Journal:
Mol Phylogenet Evol
Journal subject:
BIOLOGIA
/
BIOLOGIA MOLECULAR
Year:
2011
Document type:
Article
Affiliation country:
Germany