INPA   24560
UNIDAD EJECUTORA DE INVESTIGACIONES EN PRODUCCION ANIMAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Geometric morphometric of sagitta otolith in Anchoa tricolor (Spix & Agassiz, 1829) (Clupeiformes, Engraulidae) along its ontogenetic development at a subtropical estuary, Brasil.
Autor/es:
CARVALHO, B. M; VAZ-DOS-SANTOS, A. M; SPACH, H. L.; ; VOLPEDO, A. V
Lugar:
Penguera
Reunión:
Simposio; 5th International Otolith Symposium 2014 (IOS2014); 2014
Institución organizadora:
ICES- International Otolith Symposium Committe
Resumen:
The main goal of this study is to describe the contours of left sagitta otolith for A. tricolor along its ontogenetic development. There were carried monthly sampling activities (ago-2010 to jul-2011) at the Estuarine Complex of Paranaguá (ECP), Brazil (25º 15? -35? S e 48° 20?-45? O). A total of 325 otoliths were used in this study (20< Lt < 85mm) covering 13 length classes, plotting 13 semilandmarks in each otolith with TPSdig and TPSutil softwares. There were made two statistical analysis: Principal Component Analysis (PCA) and Canonical Variate Analysis (CVA) using the software MorphoJ to evaluate the variations in otoliths? contour among the classes intervals., PCA evidenced more conspicuous variations amongs the intervals 71-75, 76-80, 81-85mm when the otolith becomes more elongated antero-posteriorly. At the PCA diagram it was possible to observe a deformation from the rostrum development, not detected for the lowest (20-25mm) and highest (81-85mm) size class. The otolith?s shape is highly influenced by the rostrum development (67.8% of the shape variation on axis 1 of CVA). The otoliths from small fishes (35-35mm) had few variations in its shape, as expected, and increasing in animals between 40-65mm reaching a stability between 80-85mm. These variations of otoliths? shape of A. tricolor can be influenced by the limited swimming capacity of small fishes (25-35mm), since they don?t had a complete development of dorsal and anal fins. The increased shape variation for 40-65mm class is related to its higher swimming ability and gonadal development, leading to a higher shape stability after gonadal maturation between 80-85mm.