Por favor, use este identificador para citar o enlazar este ítem: http://dspace.azti.es/handle/24689/324
Ficheros en este ítem:
No hay ficheros asociados a este ítem.
Título : Geographic variation of body morphology of the Atlantic bluefin tuna, (Thunnus thynnus, Linnaeus, 1758)
Autor : Addis, P.; Secci, M.; Pischedda, M.; Laconcha, U.; Arrizabalaga, Haritz
Citación : JOURNAL OF APPLIED ICHTHYOLOGY, 2014, 30, 930-936
Resumen : Geometric morphometric methods were used to explore body shape morphology in 260 Atlantic bluefin tuna, Thunnus thynnus, collected in Sardinia (Western Mediterranean) during the breeding phase and in the Bay of Biscay (North Eastern Atlantic) during the feeding phase. The shape of each specimen was captured by high resolution digital images and recording the 2-D coordinates of seven morphological landmarks. A general procruste analysis (GPA) was applied in order to eliminate any morphological variations resulting from size, position or orientation of specimens. A thin plate-spline (TPS) method was then used to provide a graphical representation of the shape conformation between two sets of data. Results of the regression model between the direct and indirect measurements accounted for a R-2 = 0.98. The Principal Components Analysis shows differences linked to the two sampling areas, accounting for 37\% and 19.97\% of the body shape variation in the first (PC1) and second (PC2) principal component, respectively. Specifically, the deformation grid projection highlights the major differences regarding the anterior-ventral part of the body (landmark 5-6-7). These differences might not necessarily be linked to an actual population substructure. Instead, it was hypothesized that such body shape differences were due to the diverse life phases during which specimens were collected, since the reproductive specimens show a `pot-bellied' shape, which was larger than for the feeding specimens that showed a `slimmer' shape. Analyses of likely sexual dimorphism conducted on Sardinian specimens did not reveal any significant differences; whereas body shape differences related to the pre- and post-reproductive sizes were detected.
Palabras clave : MEDITERRANEAN SEA; GEOMETRIC MORPHOMETRICS; SHAPE; L.; EASTERN; REVOLUTION; FISHERIES; SPARIDAE; BREAM; SIZE
Fecha de publicación : 2014
Editorial : WILEY-BLACKWELL
Tipo de documento: Article
Idioma: Inglés
DOI: 10.1111/jai.12453
URI : http://dspace.azti.es/handle/24689/324
ISSN : 0175-8659
E-ISSN: 1439-0426
Patrocinador: Ministerio de Economia y Competitividad of the Spanish Government [CTM2011-27505]
Italian Ministry of Education, University and Research
Aparece en las tipos de publicación: Artículos científicos



Los ítems de DSpace están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.