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Inter-annual isotopic niche segregation of wild humboldt penguins through years of different El Niño intensities

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dc.contributor.author Chiu-Werner, Antje
dc.contributor.author Ceia, Filipe R.
dc.contributor.author Cardenas-Alayza, Susana
dc.contributor.author Cardena-Mormontoy, Marco
dc.contributor.author Adkesson, Michael
dc.contributor.author Xavier, Jose
dc.date.accessioned 2019-08-08T15:23:46Z
dc.date.available 2019-08-08T15:23:46Z
dc.date.issued 2019
dc.identifier.uri https://hdl.handle.net/20.500.12866/7152
dc.description.abstract The Humboldt Current System presents high interannual variability, influenced by the El Nino Southern Oscillation (ENSO), whose implications in wildlife are not fully understood. We studied the isotopic niche of wild Humboldt penguins at Punta San Juan (Peru) during the pre-moult foraging trip in 4 consecutive years (2008-2011) under known oceanographic (ENSO) conditions. Our results show that there is a clear isotopic niche segregation (on both delta(13)C and delta(15)N values) of wild Humboldt penguins among all years. Besides isotopic niche segregation, niche width also varied significantly among years. The larger isotopic niche displayed in 2008 reflected the opportunistic feeding behaviour of Humboldt penguins when oceanographic conditions were unfavourable (i.e. El Nino of strong intensity). In contrast, and despite strong segregation, penguins displayed a more specialist behaviour in years of mild environmental conditions (i.e. 2009 "warm-weak", 2010 "neutral" and 2011 "warm-moderate"). No evidence of sexual segregation in wild Humboldt penguins during the pre-moulting foraging trip was found. This study highlights the coping mechanisms of an endangered species to changes in environmental conditions (i.e. overall, from strong to neutral El Nino events), which should have important ramifications in the management of the marine ecosystem in Peru, particularly the one related to the anchovy industry. en_US
dc.language.iso eng
dc.publisher Elsevier
dc.relation.ispartof urn:issn:1879-0291
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject Peru en_US
dc.subject Diet en_US
dc.subject Spheniscus humboldti en_US
dc.subject El Niño en_US
dc.subject Humboldt penguins en_US
dc.subject Population dynamics en_US
dc.subject Punta San Juan en_US
dc.subject Sea surface temperature anomaly en_US
dc.subject Seabirds en_US
dc.subject Stable isotopes en_US
dc.title Inter-annual isotopic niche segregation of wild humboldt penguins through years of different El Niño intensities en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1016/j.marenvres.2019.104755

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