dimorfismo sexual y relaciones morfométricas de atlantoraja platana (günther, 1880) en aguas del golfo san matías, patagonia dimorphism and morphometric relationships of atlantoraja platana (günther, 1880) in san matías gulf waters, patagonia

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ID: 256041
2011
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Abstract
Resumen: La "raya platana" (Atlantoraja platana), es una especie endémica del Atlántico Sudoccidental, habita desde los 22° S (Uruguay y sur de Brasil) hasta los 42° S, región del golfo de San Matías, no siendo encontrada para el resto de la plataforma del mar argentino. Se describen en este estudio aspectos morfométricos de esta raya. En el Golfo San Matías (41°-42°S y 64°-65°O), un total de 778 hembras y 709 machos fueron muestreados de diversas fuentes, entre 2004 y 2006. La longitud total fue de 19 a 89 cm para las hembras y de 19 a 79 cm para los machos. Atlantoraja platana presentó dimorfismo sexual en las relaciones largo-peso y largo-ancho de disco. Desde 41 cm en adelante las hembras fueron más pesadas que los machos. La relación longitud total -peso total fue PT= 0,0132 x LT2,91 para las hembras y PT= 0,0222 x LT2,77 para los machos. Las relaciones de longitud total-ancho de disco fue de AD= 7,27 + 0,762LT para las hembras y AD= 7,768 + 0,798LT para los machos. Este es el primer informe sobre relaciones morfométricas en esta especie del Mar Argentino y puede ser utilizado para fines comparativos entre diferentes localizaciones latitudinales de esta raya.
The skate Atlantoraja platana, commonly known in Argentina as "raya platana", is endemic to the Southwest Atlantic. It is distributed from Brasil (24°S) to north Patagonian waters (42°11'S). In this study the morphometric aspects of this skate were described. In the San Matías gulf (41°-42°S y 64°-65°W), a total of 778 females and 709 males were sampled from different sources between 2004 and 2006. The total length ranged was 19 to 89 cm for females and 19 to 79 cm for males. Atlantoraja platana was sexually dimorphic in total length-weight and total length-disc width relationships. Since 41 cm onwards the females are being heavier than males. The total length-weight relationship was Pt= 0.0132 x Lt2.91 for females and Pt= 0.0222 x Lt2.77 for males. The total length-disc width relationship was DW= 7.27 + 0.762Lt for females and DW= 7.768 + 0.798Lt for males. This is the first report of morphometric relationships of this species in the Argentinean Sea and they should be used for comparison purpose between different latitudinal localizations of this skate.
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Authors ;Nidia Marina Coller;María Raquel Perier;Edgardo Ernesto Di Giacomo
Journal international journal of bank marketing
Year 2011
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