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dc.contributor.author Pozzi, Luciana Melina
dc.contributor.author Garcia Borboroglu, Jorge Pablo
dc.contributor.author Boersma, P. Dee
dc.contributor.author Pascual, Miguel Alberto
dc.date.available 2017-07-26T21:24:45Z
dc.date.issued 2015-03-18
dc.identifier.citation Pozzi, Luciana Melina; Garcia Borboroglu, Jorge Pablo; Boersma, P. Dee; Pascual, Miguel Alberto; Population regulation in Magellanic penguins: what determines changes in colony size?; Public Library of Science; Plos One; 10; 3; 18-3-2015; 1-16; e0119002
dc.identifier.uri http://hdl.handle.net/11336/21409
dc.description.abstract Seabirds are often studied at individual colonies, but the confounding effects of emigration and mortality processes in open populations may lead to inappropriate conclusions on the mechanisms underlying population changes. Magellanic penguin (Spheniscus magellanicus) colonies of variable population sizes are distributed along the Argentine coastline. In recent decades, several population and distributional changes have occurred, with some colonies declining and others newly established or increasing. We integrated data of eight colonies scattered along ~600 km in Northern Patagonia (from 41°26´S, 65°01´W to 45°11´S, 66°30´W, Rio Negro and Chubut provinces) and conducted analysis in terms of their growth rates, production of young and of the dependence of those vital rates on colony age, size, and location. We contrasted population trends estimated from abundance data with those derived from population modeling to understand if observed growth rates were attainable under closed population scenarios. Population trends were inversely related to colony size, suggesting a density dependent growth pattern. All colonies located in the north — which were established during the last decades — increased at high rates, with the smallest, recently established colonies growing at the fastest rate. In central-southern Chubut, where colonies are the oldest, the largest breeding aggregations declined, but smaller colonies remained relatively stable. Results provided strong evidence that dispersal played a major role in driving local trends. Breeding success was higher in northern colonies, likely mediated by favorable oceanographic conditions. However, mean foraging distance and body condition of chicks at fledging were influenced by colony size. Recruitment of penguins in the northern area may have been triggered by a combination of density dependence, likely exacerbated by less favorable oceanographic conditions in the southern sector. Our results reaffirm the idea that individual colony trends do not provide confident indicators of population health, highlighting the need to redefine the scale for the study of population changes.
dc.format application/pdf
dc.language.iso eng
dc.publisher Public Library of Science
dc.rights info:eu-repo/semantics/openAccess
dc.rights.uri https://creativecommons.org/licenses/by/2.5/ar/
dc.subject Magellanic penguin
dc.subject colony size
dc.subject population regulation
dc.subject Patagonia
dc.subject.classification Ecología
dc.subject.classification Ciencias Biológicas
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title Population regulation in Magellanic penguins: what determines changes in colony size?
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2017-07-13T14:01:19Z
dc.identifier.eissn 1932-6203
dc.journal.volume 10
dc.journal.number 3
dc.journal.pagination 1-16; e0119002
dc.journal.pais Estados Unidos
dc.journal.ciudad San Francisco
dc.description.fil Fil: Pozzi, Luciana Melina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
dc.description.fil Fil: Garcia Borboroglu, Jorge Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina. Global Penguin Society. Washington; Estados Unidos. University of Washington; Estados Unidos
dc.description.fil Fil: Boersma, P. Dee. Global Penguin Society. Washington; Estados Unidos. University of Washington; Estados Unidos
dc.description.fil Fil: Pascual, Miguel Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia; Argentina
dc.journal.title Plos One
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1371/journal.pone.0119002
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0119002


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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution 2.5 Unported (CC BY 2.5)