Please use this identifier to cite or link to this item:
Title: Landmark-based geometric morphometrics analysis of body shape variation among populations of the blue jack mackerel, Trachurus picturatus, from the North-East Atlantic
Authors: Moreira, Cláudia
Froufe, Elsa
Vaz-Pires, Paulo
Triay Portella, Raül 
Correia, Alberto Teodorico
UNESCO Clasification: 310504 Protección de los peces
531201 Agricultura, silvicultura, pesca
310503 Localización de peces
Keywords: Body shape
Truss network
Morphometric variations
Characteristic habitats
Phenotypic stocks
Issue Date: 2020
Journal: Journal of Sea Research 
Abstract: Phenotypic variation in fish can indicate exposure to different environmental conditions, affecting species growth and maturation rates and/or be a consequence of genetic factors that allow fish adaptation to different environments. Understanding population structure and dynamics is extremely important for the establishment of sustainable fisheries. The blue jack mackerel, Trachurus picturatus, is an important fishery resource of the North-East (NE) Atlantic. Fish were captured in six sampling locations in the NE Atlantic - Azores, Madeira, Canaries and Portugal mainland - Matosinhos, Peniche and Portimão. The phenotypic diversity of the species was studied using body landmark-based geometric morphometrics. A truss box method was followed and 30 distance variables were extracted from digital images. Additionally, the temporal stability of the morphological characters was investigated by comparing samples from two different years: 2016 and 2019. The transformed distances were analysed by univariate and multivariate statistics. The Macaronesia region – Azores, Madeira and Canaries – and Portugal mainland displayed a clear phenotypic pattern. Distances related to the body width and caudal peduncle were the most significant variables explaining the observed phenotypic heterogeneity. Furthermore, this study also showed that T. picturatus can exhibit fast phenotypic adaptations to the surrounding environment, observed by the discrimination of Peniche in 2019. Nevertheless, the high overall allocation of individuals to the original location observed for both years (78% in 2016 and 83% in 2019) suggests that the population of T. picturatus in the NE Atlantic is phenotypic heterogeneous. These findings corroborate previous studies and have implications for fishery management.
ISSN: 1385-1101
DOI: 10.1016/j.seares.2020.101926
Source: Journal of Sea Research [ISSN 1358-1101], v. 163, 101926, (August 2020)
Appears in Collections:Artículos
Adobe PDF (1,06 MB)
Show full item record


checked on May 28, 2023

Google ScholarTM




Export metadata

Items in accedaCRIS are protected by copyright, with all rights reserved, unless otherwise indicated.