Reproductive performance of resident and migrant males, females and pairs in a partially migratory bird

The Journal of Animal Ecology
Hannah GristJane M Reid

Abstract

Quantifying among-individual variation in life-history strategies, and associated variation in reproductive performance and resulting demographic structure, is key to understanding and predicting population dynamics and life-history evolution. Partial migration, where populations comprise a mixture of resident and seasonally migrant individuals, constitutes a dimension of life-history variation that could be associated with substantial variation in reproductive performance. However, such variation has rarely been quantified due to the challenge of measuring reproduction and migration across a sufficient number of seasonally mobile males and females. We used intensive winter (non-breeding season) resightings of colour-ringed adult European shags (Phalacrocorax aristotelis) from a known breeding colony to identify resident and migrant individuals. We tested whether two aspects of annual reproductive performance, brood hatch date and breeding success, differed between resident and migrant males, females and breeding pairs observed across three consecutive winters and breeding seasons. The sex ratios of observed resident and migrant shags did not significantly differ from each other or from 1:1, suggesting that both sexes are parti...Continue Reading

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Citations

Aug 11, 2017·The Journal of Animal Ecology·James J Gilroy
Nov 28, 2019·Proceedings. Biological Sciences·Thomas R HaalandIrja I Ratikainen
Mar 14, 2018·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Leone M Brown, Richard J Hall
Mar 27, 2018·Biological Reviews of the Cambridge Philosophical Society·Jane M ReidCalvin Dytham
Mar 19, 2020·Proceedings. Biological Sciences·Tiago de Zoeten, Francisco Pulido
Jun 24, 2021·The Journal of Animal Ecology·Joshua S BarrowJohn R Morrongiello
Dec 4, 2021·Biological Reviews of the Cambridge Philosophical Society·Elène Haave-AudetKimberley J Mathot

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