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Start Over Descriptor "Deep-sea shark" Journal molecular ecology
2 results on '"Deep-sea shark"'

1. The Pillars of Hercules as a bathymetric barrier to gene flow promoting isolation in a global deep-sea shark (Centroscymnus coelolepis).

Author

Catarino, Diana, Knutsen, Halvor, Veríssimo, Ana, Olsen, Esben Moland, Jorde, Per Erik, Menezes, Gui, Sannæs, Hanne, Stanković, David, Company, Joan Baptista, Neat, Francis, Danovaro, Roberto, Dell'Anno, Antonio, Rochowski, Bastien, and Stefanni, Sergio

Subjects
*SHARKS, *BATHYMETRY, *GENE flow, *MICROSATELLITE repeats
Abstract

Knowledge of the mechanisms limiting connectivity and gene flow in deep-sea ecosystems is scarce, especially for deep-sea sharks. The Portuguese dogfish (Centroscymnus coelolepis) is a globally distributed and near threatened deep-sea shark. C. coelolepis population structure was studied using 11 nuclear microsatellite markers and a 497-bp fragment from the mtDNA control region. High levels of genetic homogeneity across the Atlantic (øST = -0.0091, FST = 0.0024, P > 0.05) were found suggesting one large population unit at this basin. The low levels of genetic divergence between Atlantic and Australia (øST = 0.0744, P < 0.01; FST = 0.0015, P > 0.05) further suggested that this species may be able to maintain some degree of genetic connectivity even across ocean basins. In contrast, sharks from the Mediterranean Sea exhibited marked genetic differentiation from all other localities studied (øST = 0.3808, FST = 0.1149, P < 0.001). This finding suggests that the shallow depth of the Strait of Gibraltar acts as a barrier to dispersal and that isolation and genetic drift may have had an important role shaping the Mediterranean shark population over time. Analyses of life history traits allowed the direct comparison among regions providing a complete characterization of this shark's populations. Sharks from the Mediterranean had markedly smaller adult body size and size at maturity compared to Atlantic and Pacific individuals. Together, these results suggest the existence of an isolated and unique population of C. coelolepis inhabiting the Mediterranean that most likely became separated from the Atlantic in the late Pleistocene. [ABSTRACT FROM AUTHOR]

Published
2015
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2. The Pillars of Hercules as a bathymetric barrier to gene flow promoting isolation in a global deep-sea shark (Centroscymnus coelolepis)

Author

Gui M. Menezes, David Stanković, Halvor Knutsen, B. E. A. Rochowski, Sergio Stefanni, Per Erik Jorde, Ana Veríssimo, Roberto Danovaro, Esben Moland Olsen, Diana Catarino, Francis Neat, Hanne Sannæs, Antonio Dell'Anno, and European Commission

Subjects
Mediterranean climate, Gene Flow, Male, Genotype, Population, Mediterranean, Population structure, DNA, Mitochondrial, Isolation, Mediterranean sea, Centroscymnus coelolepis, Genetic drift, Genetics, Mediterranean Sea, Animals, 14. Life underwater, education, Atlantic Ocean, Ecology, Evolution, Behavior and Systematics, mtDNA control region, education.field_of_study, Pacific Ocean, biology, Ecology, Sequence Analysis, DNA, biology.organism_classification, Biological Evolution, Barriers to dispersal, Genetic divergence, Genetics, Population, Deep-sea shark, Sharks, Biological dispersal, Female, Microsatellite Repeats
Abstract

Catarino, Diana ... et. al.-- 19 pages, 5 figures, 4 tables, data accessibility http://dx.doi.org/10.5061/dryad.ss368, supporting information http://dx.doi.org/10.1111/mec.13453, Knowledge of the mechanisms limiting connectivity and gene flow in deep-sea ecosystems is scarce, especially for deep-sea sharks. The Portuguese dogfish (Centroscymnus coelolepis) is a globally distributed and near threatened deep-sea shark. C. coelolepis population structure was studied using 11 nuclear microsatellite markers and a 497-bp fragment from the mtDNA control region. High levels of genetic homogeneity across the Atlantic (Φ = -0.0091, F = 0.0024, P > 0.05) were found suggesting one large population unit at this basin. The low levels of genetic divergence between Atlantic and Australia (Φ = 0.0744, P < 0.01; F = 0.0015, P > 0.05) further suggested that this species may be able to maintain some degree of genetic connectivity even across ocean basins. In contrast, sharks from the Mediterranean Sea exhibited marked genetic differentiation from all other localities studied (Φ = 0.3808, F = 0.1149, P < 0.001). This finding suggests that the shallow depth of the Strait of Gibraltar acts as a barrier to dispersal and that isolation and genetic drift may have had an important role shaping the Mediterranean shark population over time. Analyses of life history traits allowed the direct comparison among regions providing a complete characterization of this shark's populations. Sharks from the Mediterranean had markedly smaller adult body size and size at maturity compared to Atlantic and Pacific individuals. Together, these results suggest the existence of an isolated and unique population of C. coelolepis inhabiting the Mediterranean that most likely became separated from the Atlantic in the late Pleistocene, This study was performed under the framework of ReDEco (FP6 ERA-NET, MARIN-ERA/MAR/0003/2008) and Hermione (FP7-ENV-2008-1, nr 226354) projects. Samples were collected under other scientific projects: DEECON (ESF, 06-EuroDEEP-FP-008 & SFRH-EuroDEEP/0002/2007); CONDOR (EEA Grants, PT0040/2008); SMaRT (M.2.1.2/029/2011) and DEMERSAIS (Azorean Government); OASIS (FP5, EVK3-CT-2002-00073-OASIS); PescProf I (INTERREG III B, MAC/4.2/M12); BIOFUN (ESF, CTM2007-28739-E); DOS MARES (CTM2010-21810-C03-03); ADIOS (EVK3-CT-2000-00035). DC is a PhD student funded by FCT (SFRH/BD/65730/2009); HK is cofunded by the University of Agder and the University of Oslo (CEES); AV is a postdoctoral fellow funded by FCT (POPH/FSE; SFRH/BPD/77487/2011); DS is a postdoctoral fellow funded by the DIANET programme (FP1527385002); and SS is a research fellow supported by the Marie Curie grant cofunded by the EU under the FP7-People-2012-COFUND; Cofunding of Regional, National and International Programmes, GA n.600407 and the Bandiera Project RITMARE. MARE is funded by FCT through the strategic project UID/MAR/04292/2013

Published
2014

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