Resumen
El Petrel Gigante del Sur (Macronectes giganteus) es un ave marina pelágica con distribución circumpolar en el Hemisferio Sur y está considerado como especie Vulnerable. Es el único procellariiforme que nidifica en la costa argentina (a excepción de las Islas Malvinas). En Argentina, sus sitios de nidificación están restringidos a dos colonias en la provincia de Chubut (Isla Arce e Isla Gran Robredo) y dos colonias en Isla de los Estados (Isla Observatorio y Península López). La población reproductiva se estima en 2600 parejas, el 90% de las cuales pertenece a las colonias de Chubut. La puesta de un único huevo se inicia durante la última semana de octubre y la eclosión durante la última semana de diciembre. La independencia de los pichones ocurre hacia la segunda semana de marzo y principios de abril. La dieta está compuesta principalmente por pingüinos y cefalópodos (principalmente calamar) y por restos de mamíferos marinos, peces y decápodos. La basura constituye un componente importante de su dieta. Las áreas de alimentación durante el período reproductivo se localizan al borde del talud, en la plataforma media y en áreas costeras, con una marcada segregación sexual en el uso del espacio. Dichas áreas tienen una marcada superposición espacio-temporal con las pesquerías de langostino, calamar y merluza. El monitoreo de las poblaciones, el registro de parámetros reproductivos básicos, el conocimiento del comportamiento en el mar y la determinación de las áreas de alimentación del Petrel Gigante del Sur constituyen información prioritaria para desarrollar pautas de manejo y conservación de sus poblaciones.
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