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Sexual segregation in timing of foraging by imperial shags (Phalacrocorax atriceps): is it always ladies first?

Harris, Sabrina; Raya Rey, Andrea; Phillips, Richard A.; Quintana, Flavio. 2013 Sexual segregation in timing of foraging by imperial shags (Phalacrocorax atriceps): is it always ladies first? Marine Biology, 160 (5). 1249-1258. 10.1007/s00227-013-2177-9

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[img] Text (This article has been accepted for publication and will be published by Springer in Marine Biology. The final publication is available at 10.1007/s00227-013-2177-9 Copyright Springer.)
Harris_GLSManuscript_shag_final_doc_version.doc - Accepted Version

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Abstract/Summary

The time seabirds have to forage is restricted while breeding, as time at sea must be balanced against the need to take turns with the partner protecting the nest site or offspring, and timing constraints change once the breeding season is over. Combined geolocator-immersion devices were deployed on eleven Imperial Shags (four males and seven females) in Argentina (43°04′S; 64°2′W) in November 2006 and recovered in November 2007. During the breeding season, females foraged throughout the morning, males exclusively in the afternoon, and variability between individuals was low. Outside the breeding season, both sexes foraged throughout the day, and variability between individuals was high. Timing differences may be explained by higher constraints on foraging or greater demands of parental duties experienced by the smaller sex, females in this case. Sexual differences in reproductive role, feeding habits or proficiency can also lead to segregation in timing of foraging, particularly while breeding.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1007/s00227-013-2177-9
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Ecosystems
ISSN: 0025-3162
Date made live: 18 Jun 2013 12:29 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/502299

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