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Three-dimensional use of marine habitats by juvenile emperor penguins Aptenodytes forsteri during post-natal dispersal

Published online by Cambridge University Press:  02 January 2013

Jean-Baptiste Thiebot ,
Amélie Lescroël ,
Christophe Barbraud  and
Charles-André Bost
Jean-Baptiste Thiebot*
Affiliation:
Centre d'Etudes Biologiques de Chizé, UPR 1934 CNRS, 79360 Villiers-en-bois, France
Amélie Lescroël
Affiliation:
Biodiversité et Gestion des Territoires, Université de Rennes 1 - UMR 7204, Muséum National d'Histoire Naturelle, 263 Avenue du Général Leclerc, CS 74205, 35042 Rennes Cedex, France
Christophe Barbraud
Affiliation:
Centre d'Etudes Biologiques de Chizé, UPR 1934 CNRS, 79360 Villiers-en-bois, France
Charles-André Bost
Affiliation:
Centre d'Etudes Biologiques de Chizé, UPR 1934 CNRS, 79360 Villiers-en-bois, France
*
thiebot@cebc.cnrs.fr
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Abstract

The juvenile phase is poorly known in Antarctic seabirds, despite being a critical period for individual survival. To better understand the ecology of young Antarctic seabirds, we surveyed for the first time the three-dimensional habitat use of six juvenile emperor penguins during their post-natal dispersal from Terre Adélie, using bio-telemetric tags. The tags transmitted location and activity data for nearly 100 days on average. One individual was followed during eight months and covered 7000 km, which represents the longest continuous individual survey for the species. Studied individuals first dispersed away from Antarctica, up to 54.7°S and 1250 km north of the pack-ice edge, in the Polar Frontal Zone. This highlighted a much looser association with sea ice and a greater at-sea range compared to previous knowledge on breeding adults. Juvenile penguins then moved southwards close to the extending pack-ice during autumn and winter. Over the survey duration, juveniles showed a contrasting use of marine habitats, with less mobility, less time underwater, and shallower dives (generally not over 50–100 m) in the pack ice, versus greater distances travelled, more time spent underwater, especially deeper than 100 m (up to 250–300 m) in open water. We discuss hypotheses which could explain the northward exodus of juvenile emperor penguins across contrasting habitats.

Keywords

divingforaging ecologyimmaturity periodmigrationseabirdsSouthern Oceantracking
Type
Biological Sciences
Information
Antarctic Science , Volume 25 , Issue 4 , August 2013 , pp. 536 - 544
Copyright
Copyright © Antarctic Science Ltd 2013 

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