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2011•Seabird JournalOpen access

Female Common Terns Sterna hirundo start autumn migration earlier than males

Ian A Nisbet, Patricia Szczys, Carolyn S. Mostello, James W. Fox

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Abstract

We used geolocators to track Common Terns Sterna hirundo from a breeding colony in the northeastern USA. Seven females started autumn migration between 1 and 22 August (mean 9 August), whereas four males started between 12 August and 5 October (mean 6 September). Common Terns have prolonged post-fledging care and our findings support earlier inferences that males perform more of this care than females. This would result in higher costs for males.

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What this paper is about

We used geolocators to track Common Terns Sterna hirundo from a breeding colony in the northeastern USA. Seven females started autumn migration between 1 and 22 August (mean 9 August), whereas four males started between 12 August and 5 October (mean 6 September). Common Terns have prolonged post-fledging care and our findings support earlier inferences that males perform more of this care than females. This would result in higher costs for males.

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Available abstract

We used geolocators to track Common Terns Sterna hirundo from a breeding colony in the northeastern USA. Seven females started autumn migration between 1 and 22 August (mean 9 August), whereas four males started between 12 August and 5 October (mean 6 September). Common Terns have prolonged post-fledging care and our findings support earlier inferences that males perform more of this care than females. This would result in higher costs for males.

Key concepts: Sterna, Hirundo, Fledge, Tern, Demography, Biology, Geography, Zoology

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