Restricted connectivity and population genetic fragility in a globally endangered Hammerhead Shark

Autor: Bruno Lopes da Silva Ferrette, Mahmood S. Shivji, Cesar Martins, Danillo Pinhal, Christine C. Bruels, Otto Bismarck Fazzano Gadig, Rodrigo Rodrigues Domingues
Přispěvatelé: Universidade Estadual Paulista (Unesp), Universidade Federal de São Paulo (UNIFESP), Nova Southeastern University, Universidade Santa Cecília - UNISANTA
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Popis: Made available in DSpace on 2020-12-12T02:10:22Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-09-01 Guy Harvey Ocean Foundation Save Our Seas Foundation Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Vagile, large-bodied marine organisms frequently have wide range dispersion but also dependence on coastal habitats for part of their life history. These characteristics may induce complex population genetic structure patterns, with resulting implications for the management of exploited populations. The scalloped hammerhead, Sphyrna lewini, is a cosmopolitan, migratory shark in tropical and warm temperate waters, inhabiting coastal bays during parturition and juvenile development, and the open ocean as adults. Here, we investigated the genetic connectivity and diversity of S. lewini in the western Atlantic using large sample coverage (N = 308), and data from whole mitochondrial control region (mtCR) sequences and ten nuclear microsatellite markers We detected significant population genetic structure with both mtCR and microsatellites markers (mtCR: ΦST = 0.60; p < 0.001; microsatellites: Dest 0.0794, p = 0.001, FST = 0.046, p < 0.05), and isolation by distance (mtCR r = 0.363, p = 0.009; microsatellites markers r = 0.638, p = 0.007). Migration and gene flow patterns were asymmetric and female reproductive philopatry is postulated to explain population subdivisions. The notable population differentiation at microsatellites markers indicates low-levels of male-mediated gene flow in the western Atlantic. The overall effective population size was estimated as 299 (215–412 CI), and there was no evidence of strong or recent bottleneck effects. Findings of at least three management units, moderate genetic diversity, and low effective population size in the context of current overfishing calls for intensive management aimed at short and long-term conservation for this endangered species in the western Atlantic Ocean. Laboratório Genômica e Evolução Molecular Departamento de Genética Instituto de Biociências Universidade Estadual Paulista – UNESP, Rua Professor Doutor Antonio Celso Wagner Zanin s/nº, Rubião Júnior Departamento de Ciências do Mar Instituto do Mar Universidade Federal de São Paulo UNIFESP, Rua Carvalho de Mendonça, 144 Save Our Seas Shark Research Center USA and Guy Harvey Research Institute Nova Southeastern University, 8000 North Ocean Drive Laboratório de Genética e Conservação Universidade Santa Cecília - UNISANTA, Rua Cesário Mota, 8 Laboratório de Pesquisa de Elasmobrânquios Instituto de Biociências Universidade Estadual Paulista – UNESP, Campus do Litoral Paulista, Praça Infante D. Henrique, s/n Laboratório Genômica Integrativa Departamento de Morfologia Instituto de Biociências Universidade Estadual Paulista – UNESP Laboratório Genômica e Evolução Molecular Departamento de Genética Instituto de Biociências Universidade Estadual Paulista – UNESP, Rua Professor Doutor Antonio Celso Wagner Zanin s/nº, Rubião Júnior Laboratório de Pesquisa de Elasmobrânquios Instituto de Biociências Universidade Estadual Paulista – UNESP, Campus do Litoral Paulista, Praça Infante D. Henrique, s/n Laboratório Genômica Integrativa Departamento de Morfologia Instituto de Biociências Universidade Estadual Paulista – UNESP Guy Harvey Ocean Foundation: 0000 Save Our Seas Foundation: 000000 FAPESP: 2007/03065-5 FAPESP: 2007/03067-8 FAPESP: 2017/02420-8
Databáze: OpenAIRE
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