Population structure of the blue jack mackerel (Trachurus picturatus) in the NE Atlantic inferred from otolith microchemistry

• Tipo: Artigo em Revista Científica Internacional
• Data: 2018

Autores

Moreira, C (Autor) Outra; Froufe, E (Autor) Outra; Sial, AN (Autor) Outra; Caeiro, A (Autor) Outra; vaz-pires, p (Autor) ICBAS; Correia, AT (Autor) Outra

Revista

Título: Fisheries Research

Vol. 197

Páginas: 113-122

ISSN: 0165-7836

Editora: Elsevier

Indexação

ISI Web of Knowledge - 8 Citações

Scopus - 28 Citações

Outras Informações

ID Authenticus: P-00N-5GW

DOI: 10.1016/j.fishres.2017.08.012

Abstract (EN): The blue jack mackerel, Trachurus picturatus, is an economically important fishery resource of the NE Atlantic, commonly captured around the Macaronesian islands of Azores, Madeira and Canaries, but also along coastal Portugal mainland. Despite this, information regarding the T. picturatus population structure is, at present, nonexistent. One hundred and twenty individuals of T. picturatus were collected in 2013 from six important fishery regions of the NE Atlantic: Azores, Madeira, Canaries and Portugal mainland - Matosinhos, Peniche and Portimgo. Elemental and isotopic signatures of whole sagittal otoliths were determined by inductively coupled plasma mass spectrometry and isotope ratio mass spectrometry, respectively. Elemental (Sr/Ca, Ba/Ca, Mg/Ca, Pb/Ca, Li/Ca, Fe/Ca and Mn/Ca) and isotopic ratios (delta O-18 and delta C-13) were analysed with univariate and multivariate statistics to determine whether these chemical signatures provide insight into regional population structure. Whole otolith signatures gave distinct regional signatures, mainly driven by spatial differences in Sr/Ca, Ba/Ca, Li/Ca and delta C-13, namely between the Portugal mainland and the oceanic islands. Furthermore, the results suggest for the first time that Portugal mainland, Azores, Madeira, and Canaries should be regarded as different population units. The high re-classification success rate (an overall of 81%) for these regions obtained from the quadratic discriminant function analysis supports these findings, and suggests the management of this fishery in the NE Atlantic as different stocks.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10