Genetic characterisation of the Rhodanian twaite shad, Alosa fallax rhodanensis |
| |
Authors: | M. LE CORRE,P. ALEXANDRINO,M. R. SABATIE,M. W. APRAHAMIAN,& J. L. BAGLINIÈ RE |
| |
Affiliation: | UMR INRA-Agrocampus Rennes Ecobiologie et Qualitédes Hydrosystèmes Continentaux, Rennes, France;Laboratoire d'Halieutique, Agrocampus, Rennes, FranceAnimal Genetics and Conservation CECA ICETA, Universidade do Porto, Vila do Conde, PortugalUMR INRA-Agrocampus Rennes Ecobiologie et Qualitédes Hydrosystèmes Continentaux, Rennes, France;Laboratoire d'Halieutique, Agrocampus, Rennes, FranceEnvironment Agency, Warrington, UKUMR INRA-Agrocampus Rennes Ecobiologie et Qualitédes Hydrosystèmes Continentaux, Rennes, France |
| |
Abstract: | Abstract Data on the genetic characteristics of the rhodanian shad, Alosa fallax rhodanensis Roule, using three Mediterranean populations (rivers Rhône, Aude and Hérault) and seven protein markers are presented. Allelic frequency distribution, and absolute and relative genetic diversity show a genetically homogeneous structure in the Mediterranean populations. Results when compared with allis ( Alosa alosa Linné) and twaite ( Alosa fallax fallax Lacépède) shad Atlantic populations confirm that the Rhodanian shad belongs to the Alosa fallax Roule species. Furthermore, genetic characteristics of the twaite shad Mediterranean group were quite different from Atlantic populations but remained close to the most southern Atlantic population in the Oued Sebou (Morocco). These findings suggest that Rhodanian shad should be considered a well identified homogeneous group within Alosa fallax rather than a subspecies because of the low genetic distance and some relatively different biological characteristics between the Atlantic and Mediterranean twaite shad groups. |
| |
Keywords: | Alosa fallax diadromous enzymatic polymorphism genetic variability Mediterranean Sea taxonomy |
|
|