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Identifying populations of the Blue Jack Mackerel (Trachurus picturatus) in the Northeast Atlantic by using geometric morphometrics and otolith shape analysis
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Orientador(es)
Resumo(s)
The population structure
of the blue jack mackerel (Trachurus
picturatus, Osteichthyes, Carangi dae), in the northeast Atlantic is
still unknown. To identify any dis tinct population units, three areas
were selected: waters off Madeira,
Peniche (mainland Portugal), and
the Canary Islands. Knowledge of
population structure is an aspect of
the population dynamics of a spe cies that is essential to effectively
assess the existence of stocks and
manage fisheries. In this study, geo metric morphometrics and otolith
shape analysis were successfully
applied for population identifica tion. Multivariate analysis of vari ance (MANOVA) revealed no body
shape differences between males
and females in each area studied,
and therefore the sexes were com bined for the analysis. The results
of the discriminant analysis showed
that a low misclassification occurred
among areas; 78.0% of individuals
were correctly classified. MANOVA
performed on the otolith normalized
elliptic Fourier descriptors revealed
significant areal differences, but no
difference between sexes. An overall
classification success of 73.3% in the
canonical discriminant analysis was
achieved. These results indicate the
usefulness of both otolith and body
shape analysis for differentiation of
blue jack mackerel stocks from the
northeast Atlantic and indicate the
existence of at least three distin guishable populations of this specie
Descrição
Palavras-chave
Blue Jack Mackerel (Trachurus picturatus) Trachurus picturatus) Identifying populations Geometric morphometrics Otolith shape analysis Northeast Atlantic . Faculdade de Ciências da Vida
Contexto Educativo
Citação
Vasconcelos, J., Vieira, A. R., Sequeira, V., Gonzalez, J. A., Kaufmann, M., & Gordo, L. S. (2018). Identifying populations of the blue jack mackerel (Trachurus picturatus) in the Northeast Atlantic by using geometric morphometrics and otolith shape analysis. Fishery Bulletin. DOI: 10.7755/FB.116.1.9
Editora
National Marine Fisheries Service