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Levels of connectivity between longnose skate (Dipturus oxyrinchus) in the Mediterranean Sea and the north-eastern Atlantic Ocean |
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| Authors: | Andrew M Griffiths David W Sims Andrew Johnson Arve Lynghammar Matthew McHugh Torkild Bakken Martin J Genner |
| Institution: | 1. The Laboratory, Marine Biological Association of the United Kingdom, Citadel Hill, Plymouth, PL1 2PB, UK 2. Marine Biology and Ecology Research Centre, Marine Institute, School of Marine Sciences and Engineering, University of Plymouth, Drake Circus, Plymouth, PL4 8AA, UK 3. School of Ocean Sciences, Bangor University, Menai Bridge, Anglesey, LL59 5AB, UK 4. Museum of Natural History and Archeology, Norwegian University of Science and Technology, 7491, Trondheim, Norway 5. School of Biological Sciences, University of Bristol, Woodland Road, Bristol, BS8 1UG, UK |
| Abstract: | 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. |
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