CANIBALISMO EN Nycticorax nycticorax Y DEPREDACIÓN INTERESPECÍFICA DE JUVENILES DE N. nycticorax SOBRE PICHONES Ardea alba (ARDEIDAE) EN UNA COLONIA MIXTA EN ARGENTINA
DOI:
https://doi.org/10.4257/oeco.2022.2604.09Keywords:
garzas, río Paraná, canibalismo, comportamientoAbstract
Existen escasos estudios que han documentado canibalismo y depredación entre especies de garzas (Ardeidae) coloniales y las causas que desencadenan estos comportamientos. En este trabajo, se describe el canibalismo de juveniles de Nycticorax nycticorax consumiendo pichones conspecíficos menos desarrollados y depredación intraespecífica sobre pichones de Ardea alba en un humedal del río Paraná Medio (Santa Fe, Argentina). Las observaciones registradas en una colonia de nidificación durante 2016 se utilizaron para describir los comportamientos relacionados con la alimentación, ataque y defensa de pichones y juveniles. Es el primer registro de canibalismo en colonias de garzas para la región Neotropical. El comportamiento caníbal podría reducir las desventajas generadas por la alta mortalidad de juveniles en condiciones de escasez en la colonia incrementando sus probabilidades de supervivencia.
Few studies have documented the presence of cannibalism and predation among colonial heron species (Ardeidae) and the causes of these behaviors. In this study, we describe cannibalism by juveniles of Nycticorax nycticorax consuming conspecific younger chicks and predation of these juveniles on chicks of Ardea alba in a wetland of the Parana Middle River (Santa Fe, Argentina). During 2016, the observations recorded were used to describe the behaviors related to the feeding, attack and defense of chicks and juveniles. This is the first record of cannibalism in heron colonies in the Neotropical region. The cannibalism could reduce the disadvantages generated by the high mortality of juveniles in the colony, increasing their chances of survival.
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