Comportamiento de alimentación del pingüino de Magallanes (Spheniscus magellanicus) en tres colonias del norte de la Patagonia.
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Author
Luzenti, Elvio AgustínDate
2014
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Show full item recordAlternative Title
Feeding behaviour of the Magellanic penguin (Spheniscus magellanicus) in three colonies of North Patagonia.Abstract
Magellanic penguin (Spheniscus magellanicus) is a central place forager, commuting between colonies and feeding areas. According to central-place foraging theory, prey items closer to the colony would be preferred over those farthest away, which could lead to prey depletion near colony, forming the so called Ashmole's Halo (Ashmole 1963). In this way, this is expected that larger colonies have a larger halo than smaller ones due to intraspecific competition. To asses this hypothesis, feeding effort of penguins from three colonies in north Patagonia (Argentine Sea, Southwest Atlantic Ocean) are compared by equipping them with electronic devices capable of recording data from several variables, such as position, depth, velocity and time. Two of the colonies, one located at Islote Lobos and the other at El Pedral, were recently formed and have around 2.000 and 180 couples respectively, and the other one, located at Punta Norte, has more than 57.000 couples. Penguins from Punta Norte travelled more than twice the distance, spent more time at sea, went farther away from colony, and cover a bigger feeding area than individuals from the other colonies. Birds from Punta Norte also spent a higher proportion of the diving cycle searching for prey. This information suggests that animals from Punta Norte are spending more energy to get the food than animals from the smallest colonies. Finally, these data together with others works, shows the high capacity of Magellanic penguin to adapt its behaviour to different environmental conditions.Pages
39pp.Degree
BachelorsPublisher or University
Universidad Nacional de la Patagonia San Juan BoscoCollections