Habitat use throughout migration : linking individual consistency, prior breeding success and future breeding potential

Hoye, Bethany J., Hahn, Steffen, Nolet, Bart A. and Klaassen, Marcel 2012, Habitat use throughout migration : linking individual consistency, prior breeding success and future breeding potential, Journal of animal ecology, vol. 81, no. 3, pp. 657-666.

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Title Habitat use throughout migration : linking individual consistency, prior breeding success and future breeding potential
Author(s) Hoye, Bethany J.ORCID iD for Hoye, Bethany J. orcid.org/0000-0001-9502-5582
Hahn, Steffen
Nolet, Bart A.
Klaassen, MarcelORCID iD for Klaassen, Marcel orcid.org/0000-0003-3907-9599
Journal name Journal of animal ecology
Volume number 81
Issue number 3
Start page 657
End page 666
Total pages 10
Publisher Wiley - Blackwell Publishing
Place of publication Oxford, England
Publication date 2012-05
ISSN 0021-8790
Keyword(s) dietary specialization
lifetime reproductive success
migratory flyway
resource use
seasonal interaction
Summary 1. Habitat use can influence individual performance in a wide range of animals, either immediately or through carry-over effects in subsequent seasons. Given that many animal species also show consistent individual differences in reproductive success, it seems plausible that individuals may have consistent patterns of habitat use representing individual specializations, with concomitant fitness consequences.

2. Stable-carbon isotope ratios from a range of tissues were used to discern individual consistency in habitat use along a terrestrial–aquatic gradient in a long-distance migrant, the Bewick’s swan (Cygnus columbianus bewickii). These individual specialisations represented <15% of the isotopic breadth of the population for the majority of individuals and were seen to persist throughout autumn migration and overwintering until aquatic habitats were no longer available.

3. Individual foraging specialisations were then used to demonstrate two consecutive carry-over effects associated with macroscale habitat segregation: consequences of breeding season processes for autumn habitat use; and consequences of autumn habitat use for future reproductive success. Adults that were successful breeders in the year of capture used terrestrial habitats significantly more than adults that were not successful, revealing a substantial cost of reproduction and extended parental care. Use of aquatic habitats during autumn was, however, associated with increased body condition prior to spring migration; and increased subsequent breeding success in adults that had been unsuccessful the year before. Yet adults that were successful breeders in the year of capture remained the most likely to be successful the following year, despite their use of terrestrial habitats.

4. Our results uniquely demonstrate not only individual foraging specializations throughout the migration period, but also that processes during breeding and autumn migration, mediated by individual consistency, may play a fundamental role in the population dynamics of long-distance migrants. These findings, therefore, highlight the importance of long-term consistency to our understanding of habitat function, interindividual differences in fitness, population dynamics and the evolution of migratory strategies.
Language eng
Field of Research 069999 Biological Sciences not elsewhere classified
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2012, The Authors. Journal of Animal Ecology, British Ecological Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30046869

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