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Comparing the foraging strategies of a seabird predator when recovering from a drastic climatic event

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Abstract

Seabirds due to their status as sentinels of the marine environment can indicate qualitative changes at various levels of the food web. Furthermore, changes in marine productivity have been correlated with fluctuations in large-scale atmospheric conditions driven by global indices, such as the North Atlantic Oscillation (NAO) index. During the winter of 2009/2010, the second lowest NAO index in history was recorded leading to detrimental conditions that influenced productivity levels in the northeast Atlantic. The response of the Cory’s Shearwater Calonectris borealis, during the period of ameliorating climatic conditions from this drastic event, was monitored in two islands with contrasting productivity patterns: Berlenga, located on the rich upwelling area of the Portuguese shelf; and Cima Islet (Porto Santo Island), located in a poor oceanic environment in the Madeira Archipelago. We collected a multi-year GPS-tracking data set (2011–2015) from adult breeders during the chick-rearing season to examine their at-sea foraging distribution. During a year of low productivity, kernel estimations demonstrated that Cima Islet birds expanded their home ranges and core foraging areas all over the northeast Atlantic, whereas Berlenga birds maintained their distribution close to the breeding colony. Once oceanographic conditions ameliorated from 2012 to 2015, birds decreased significantly their foraging effort, and oceanic breeders concentrated their activity closer to the breeding colony. Analysis of habitat use by means of Maximum Entropy Modelling confirmed distance-to-colony as the most important predictor in the distribution of Cory’s Shearwater. Environmental variables describing sea surface temperature, bathymetry, and chlorophyll a were more influential in Porto Santo, indicating higher sensitivity of the oceanic population to marine productivity proxies. Our study confirms that the Cory’s Shearwater possesses enormous flexibility in its foraging tactics and that neither oceanic nor neritic populations disperse randomly from their breeding colonies to the open ocean even under conditions of environmental stochasticity. Instead, populations breeding in contrasting environments vary in their responses according to their strategies and to the changing levels of marine productivity in the surroundings of their colonies.

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Acknowledgements

We thank the wardens Madeira Natural Park Service and the Reserva Natural das Berlengas for their help with boat trips, accommodation and companionship. Laura Castelló, Lucas Krüger, and all the volunteers that provided a valuable help during fieldwork.

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Correspondence to Vítor H. Paiva.

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Financial support for fieldwork was provided by the EU project LIFE09 NAT/PT/000041 and by EU INTERREG project FAME 2009-1/089. This research was co-sponsored by the Foundation for Science and Technology (FCT; Portugal) and the European Social Fund (POPH, EU) through post-doctoral grants to F.R.C. (SFRH/BPD/95372/2013) and V.H.P. (SFRH/BPD/85024/2012) and the strategic program of MARE (MARE—UID/MAR/04292/2013). All authors declare that they have no conflict of interests. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. Specifically, the experimental approach was conducted with permission from the Portuguese Government—‘Instituto de Conservação da Natureza e Florestas (ICNF)’—with Permit No. 89/2011/CAPT. All methods used in this study comply with the Portuguese laws No. 140/99, No. 49/2005, No. 316/89, and No. 180/2008.

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Avalos, M.R., Ramos, J.A., Soares, M. et al. Comparing the foraging strategies of a seabird predator when recovering from a drastic climatic event. Mar Biol 164, 48 (2017). https://doi.org/10.1007/s00227-017-3082-4

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