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Marine Biology

, Volume 162, Issue 3, pp 649–660 | Cite as

Foraging by experienced and inexperienced Cory’s shearwater along a 3-year period of ameliorating foraging conditions

  • Fredrik D. Haug
  • Vítor H. Paiva
  • Antje C. Werner
  • Jaime A. Ramos
Original Paper

Abstract

Experience is believed to be an important factor determining the foraging success of animals, but there is limited knowledge on how foraging tactics differ among individuals, and on how individuals develop efficient foraging strategies. Pelagic seabirds are some of the longest living organisms, and in several species, breeding is deferred far beyond their physical maturity. The complex foraging skills needed to successfully rear a young is considered the most likely explanation for this life trait, making seabirds particularly interesting for the investigation of how foraging skills differ and develop through their life span. In our study, the spatial distribution and foraging tactics of experienced and inexperienced males of a Procellariiform seabird species, the Cory’s shearwater (Calonectris borealis) breeding on the Portuguese continental shelf, were compared along three consecutive breeding seasons with ameliorating environmental conditions (from 2010 towards 2012). Kernel overlaps of foraging areas and habitat modelling demonstrated that while experienced males showed high fidelity to shallow feeding grounds, inexperienced birds were more explorative and relied more on less-productive pelagic areas. Our results seem to support the prediction that differences between experienced and inexperienced individuals are enhanced by food scarcity. In fact, there was a higher spatial, trophic and behavioural segregation between both groups when environmental conditions were poor, which progressively diminished with improving environmental conditions. Still, we cannot rule out the fact that inexperienced birds might be gaining experience with each breeding season and thus honing their foraging skills towards those of experienced individuals.

Keywords

Home Range North Atlantic Oscillation Index Experienced Male Trophic Ecology Isotopic Niche 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We would like to thank the Instituto da Conservação da Natureza e Florestas (ICNF) for their logistical support (lodging), especially the wardens of the Reserva Natural das Berlengas, Paulo Crisóstomo and Eduardo Mourato, for their companionship. Also a special thanks to Filipe Ceia and Margarida Soares for their help during fieldwork. GPS loggers were financed by the EU INTERREG project FAME: The Future of the Atlantic Marine Environment. F.D.H. acknowledges the study grant given by the EMMC-EMAE consortium and the European Commission. V.H.P. acknowledges the postdoctoral grants given by Fundação para a Ciência e Tecnologia (FCT; SFRH/BPD/63825/2009 and SFRH/BPD/85024/2012). The experimental approach was conducted with permission from the Portuguese Government (ICNF). All methods used in this study comply with the current laws of Portugal.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Fredrik D. Haug
    • 1
  • Vítor H. Paiva
    • 1
  • Antje C. Werner
    • 1
    • 2
  • Jaime A. Ramos
    • 1
  1. 1.MARE – Marine and Environmental Sciences Centre, Departamento de Ciências da Vida, Faculdade de Ciências e TecnologiaUniversidade de CoimbraCoimbraPortugal
  2. 2.Departamento de Ornitología, Museo de Historia Natural “Javier Prado”Universidad Nacional Mayor de San MarcosLima 14Peru

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