INPA   24560
UNIDAD EJECUTORA DE INVESTIGACIONES EN PRODUCCION ANIMAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Geometric morphometry of sagitta otolith in Anchoa tricolor (Spix & Agassiz, 1829) along its ontogenetic development at a subtropical estuary
Autor/es:
CARVALHO, B.M.; VAZ-DOS-SANTOS, A. M.,; SPACH, H. L. ; A V VOLPEDO
Lugar:
Recife
Reunión:
Congreso; XXI Encontro de Brasileros de Ictiologos; 2015
Institución organizadora:
Sociedad Brasilera de Ictiologos
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.