Genetic analysis provides insights into species distribution and population structure in East Atlantic horse mackerel (Trachurus trachurus and T. capensis)

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dc.contributor.author Nunoo, F.K.E.
dc.contributor.author Healey, A.J.E.
dc.contributor.author Farthing, M.W.
dc.contributor.author Potts, W.M.
dc.contributor.author Sauer, W.H.H.
dc.contributor.author Skujina, I.
dc.contributor.author King, N.
dc.contributor.author de Becquevort, S.
dc.contributor.author Shaw, P.W.
dc.contributor.author McKeown, N.J.
dc.date.accessioned 2020-06-30T12:25:32Z
dc.date.available 2020-06-30T12:25:32Z
dc.date.issued 2020-02-05
dc.identifier.citation Healey AJE, Farthing MW, Nunoo FKE, et al. Genetic analysis provides insights into species distribution and population structure in East Atlantic horse mackerel (Trachurus trachurus and T. capensis). J Fish Biol. 2020;96:795–805. https://doi.org/10.1111/jfb.14276 en_US
dc.identifier.other https://doi.org/10.1111/jfb.14276
dc.identifier.uri http://ugspace.ug.edu.gh/handle/123456789/35402
dc.description Research Article en_US
dc.description.abstract Two sister species of horse mackerel (Trachurus trachurus and T. capensis) are described that are intensively harvested in East Atlantic waters. To address longstanding uncertainties as to their respective geographical ranges, overlap and intraspecific population structure this study combined genetic (mitochondrial DNA and microsatellite) analysis and targeted sampling of the hitherto understudied West African coast. mtDNA revealed two reciprocally monophyletic clades corresponding to each species with interspecies nuclear differentiation supported by FST values. The T. trachurus clade was found across the north-east Atlantic down to Ghana but was absent from Angolan and South African samples. The T. capensis clade was found only in South Africa, Angola and a single Ghanaian individual. This pattern suggests that both species may overlap in the waters around Ghana. The potential for cryptic hybridization and/or indiscriminate harvesting of both species in the region is discussed. For T. capensis mtDNA supports high gene flow across the Benguela upwelling system, which fits with the species' ecology. The data add to evidence of a lack of significant genetic structure throughout the range of T. trachurus though the assumption of demographic panmixia is cautioned against. For both species, resolution of stock recruitment heterogeneity relevant to fishery management, as well as potential hybridization, will require more powerful genomic analyses. en_US
dc.description.sponsorship Aberystwyth University PhD scholarship to AJEH en_US
dc.language.iso en en_US
dc.publisher Journal of Fish Biology en_US
dc.relation.ispartofseries 96;795-805
dc.subject biogeography en_US
dc.subject fish en_US
dc.subject genetic en_US
dc.subject species en_US
dc.subject stock en_US
dc.subject taxonomy en_US
dc.title Genetic analysis provides insights into species distribution and population structure in East Atlantic horse mackerel (Trachurus trachurus and T. capensis) en_US
dc.type Article en_US


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