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handle: 10261/28661
[EN] A numerical approach has been used to analyze the profile of sagittae of fishes for systernatic purposes. The methodological procedure follows these steps: otolith profile hand drawn using a drawing attachment coupled to a dissecting stereo microscope; obtained profiles are read by a TV camera coupled to a computer; the profile is digitized and filtered by means of appropriate image processing software and the center of gravity (c.g.) is computed; the digitized profile is resampled at isodistances from the profile point farthest from the c.g. and clockwise (100 new points for each profile) and the distances to the c.g. for each new point are computed. These sequential distances to the c.g. produce a numerical spectrurn; spectra from different otoliths are treated by advanced statistical methods. 21 right side sagittae belonging to three genera of Nototheniidae (Eleginops, Paranotothenia and Patagonotothen) caught in the Beagle Channel (Tierra del Fuego, Argentina) have been analyzed by this method. The results are equivalent to those performed by externa1 morpliology, grouping species in regard to described phylogenetic criteria
[ES] Para reconocer los perfiles de otolitos se ha utilizado un método cuantitativo, generado mediante el desarrollo de imágenes digitalizadas, que los analiza y clasifica. La aplicación se ha efectuado sobre 21 sagittae, pertenecientes a seis especies de los géneros Eleginops, Paranotothenia, Patagonotothen de la familia de los Nototénidos, que presenta numerosos conflictos desde la perspectiva sistemática y filogenética. Los resultados obtenidos son equiparables a los alcanzados en trabajos de corte filogenético basados en caracteres anatómicos externos. El método, tiende a separar las especies con sagittae de características primitivas de las más modernas
El material para el presente estudio fue obtenido con el soporte de los proyectos de investigación BIOICTIOS (financiado pro CONICET y CSIC) y COFA2-BICMAS (financiado por MEC). Parte del análisis estadístico ha sido financiado por el proyecto NAMIBIA. El Dr. F. Andrade («Laboratorio Martítimo da Guia») aportó las bases teóricas y técnicas iniciales del análisis de formas aplicadas a los otolitos. Su contribución fue posible gracias al soporte del proyecto TRANSICTIO-86, financiado por SGCI-MEC y GRUP
6 páginas, 3 figuras, 1 cuadro
Peer reviewed
Análisis de imagen, Otolitos, Nototheniidae, Image analysis, Otoliths
Análisis de imagen, Otolitos, Nototheniidae, Image analysis, Otoliths
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