Levels of connectivity between longnose skate (Dipturus oxyrinchus) in the Mediterranean Sea and the north-eastern Atlantic Ocean
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Sequencing of a partial region of the mitochondrial control region has revealed no shared haplotypes between longnose skate (Dipturus oxyrinchus L.) sampled in the north-eastern Atlantic (Norway and Rockall) and those sampled in the Mediterranean (Mallorca). Bayesian estimation of the migration rate suggests little, if any, gene flow occurs between the regions and that the populations separated 20,000 years ago. These conclusions provide a genetic basis for long-standing observations, based on egg capsule and adult size, that longnose skate in the Mediterranean may be genetically isolated from other stocks. This result has important conservation implications for the threatened longnose skate.
KeywordsElasmobranch Marine fishes Population Management Genetic differences Conservation
We are grateful to MEDITS survey programme (IEO Mallorca), and F. Neat for supporting sample collection. This work was funded by the UK Natural Environment Research Council (NERC) Oceans 2025 Strategic Research Programme Theme 6 (Science for Sustainable Marine Resources) in which DWS and MJG are Principal Investigators. Additional funding was provided by the Fishmongers Company. MJG was supported by a Great Western Research Fellowship and DWS by an MBA Senior Research Fellowship.
- Clark RS (1922) Rays and skates (Raiae). No. 1 Egg-capsules and young. J Mar Biol Assoc UK 12:577–643Google Scholar
- Excoffier L, Laval G, Schneider S (2005) Arlequin (version 3.0): an integrated software package for population genetics data analysis. Evol Bioinf Online 1:47–50Google Scholar
- Griffiths AM, Sims DW, Cotterell SP, El Nagar A, Ellis JR, Lynghammar A, McHugh M, Neat FC, Pade NG, Queiroz N, Serra-Pereira B, Rapp T, Wearmouth VJ & Genner MJ (2010) Molecular markers reveal spatially segregated cryptic species in a critically endangered fish, the common skate (Dipturus batis). Proc R Soc Biol Sci B: doi: 10.1098/rspb.2009.2111
- Hall TA (1999) BioEdit: a user-friendly biological sequence alignment editor and analysis program for Windows 95/98/NT. Nucleic Acids Symp Ser 41:95–98Google Scholar
- Hewitt GM (1996) Some genetic consequences of ice ages, and their role in divergence and speciation. Biol J Linn Soc 58:247–276Google Scholar
- Keeney DB, Heist EJ (2006) Worldwide phylogeography of the blacktip shark (Carcharhinus limbatus) inferred from mitochondrial DNA reveals isolation of western Atlantic populations coupled with recent Pacific dispersal. Mol Ecol 15:3669–3679. doi: 10.1111/j.1365-294X.2006.03036.x PubMedCrossRefGoogle Scholar
- Natoli A, Cañadas A, Concepción V, Politi E, Fernandez-Navarro P & Hoelzel AR (2008) Conservation genetics of the short-beaked common dolphin (Delphinus delphis) in the Mediterranean Sea and in the north-eastern Atlantic Ocean. Conserv Genet. doi 10.1007/s10592-007-9481-1
- Reiss H, Hoarau G, Dickey-Collas M, Wolff WJ (2009) Genetic population structure of marine fish: mismatch between biological and fisheries management units. Fish Fish 10:361–395Google Scholar
- Valsecchi E, Pasolini P, Bertozzi M, Garoia F, Ungaro N, Vacchi M, Sabelli B, Tinti F (2005) Rapid Miocene-Pliocene dispersal and evolution of Mediterranean rajid fauna as inferred by mitochondrial gene variation. J Evol Biol 18:436–446. doi: 10.1111/j.1420-9101.2004.00829.x PubMedCrossRefGoogle Scholar
- Wheeler A (1978) Key to the fishes of Northern Europe. Frederick Warne, LondonGoogle Scholar