The genetic structure and population connectivity of the Mediterranean endemic speckled skate Raja polystigma were investigated in 10 population samples (N = 232) at 7 exon-primed nuclear microsatellites and at 3 mitochondrial DNA sequence markers. The phylogeographic and population genetic analyses revealed that R. polystigma in the western and central Mediterranean represents a near-panmictic population, with a subtle but significant mitochondrial divergence of the Adriatic deme. Nuclear genotypes revealed that 2.5% of the total individuals exhibited an admixed ancestry with the sibling species R. montagui (spotted ray). Individuals with admixed ancestry were detected along with purebred individuals in the Algerian, southern Tyrrhenian, Sicilian and Adriatic R. polystigma population samples, but they were absent or rare in Sardinian and northern Tyrrhenian ones. Since the 2 species co-occur in the southwestern Mediterranean, we suggested that this area may act as a secondary hybrid zone.
KEY WORDS: Speckled skate; Spotted ray; Species misidentification; Population connectivity; Admixed ancestry; Mediterranean; Mitochondrial DNA; Microsatellites; Secondary hybrid zone
N Frodella, Rita Cannas, A Velonà, Pierluigi Carbonara, Edward Farrell, F. Fiorentino, Maria Cristina Follesa, Germana Garofalo, Farid Hemida, Cecilia Mancusi, Marco Stagioni, N Ungaro, Fabrizio Serena, F Tinti and Alessia Cariani. 2016. Population Connectivity and Phylogeography of the Mediterranean endemic skate Raja polystigma and Evidence of its Hybridization with the Parapatric Sibling R. montagui. Marine Ecology Progress Series. DOI: 10.3354/meps11799
Endemic Mediterranean Sea Speckeld Skate hybrid zone discovered in Tunisia
doi: 10.3354/meps11799 twitter.com/NickDulvy/status/758920274511142912