Title
Foraging effort in Magellanic penguins in coastal Patagonia, Argentina
Author(s)
Sala, J.E.;Wilson, R.P.;Frere, E.;Quintana, F;.
Published
2012
Publisher
Marine Ecology Progress Series
Abstract
In long-lived species such as seabirds, foraging success is considered to be related to breeding success, so quantification of foraging parameters during the breeding season should
help understand population trends. Using GPS units, we studied the foraging effort of 55 breeding
Magellanic penguins Spheniscus magellanicus from 5 colonies in coastal Patagonia, Argentina
(42 to 54°S): Punta Norte, Bahía Bustamante, Puerto Deseado, Puerto San Julián and Isla Martillo,
in an attempt to relate this to differences in breeding population trends. Measures of foraging
effort—trip duration, total distance covered and maximun distance of the foraging trips from the
breeding colony—decreased with increasing rate of population change. This information suggests
that there are large differences in foraging effort and success among Patagonian penguin
colonies, and penguins from Bahía Bustamante and Puerto Deseado, which are in the centre of the
geographic range, require the highest foraging effort but are the least successful. It is plausible
that lower population growth rates in these 2 colonies stem from the differences in food availability rather than any other process on land.
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PUB14660