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Artículo

Natural and anthropogenic factors affecting the feeding ecology of a top marine predator, the Magellanic penguin

Ramírez, Francisco; Afán, Isabel; Hobson, Keith A.; Bertellotti, Nestor MarceloIcon ; Blanco, Guillermo; Forero, Manuela G.
Fecha de publicación: 01/04/2014
Editorial: Wiley
Revista: Ecosphere
ISSN: 2150-8925
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Ecología

Resumen

Understanding how top predators respond to natural and anthropogenically induced changes in their environment is a major conservation challenge especially in marine environments. We used a multidisciplinary approach to explore the mechanisms through which a typical central-place forager, the Magellanic penguin (Spheniscus magellanicus) from the Chubut province of Argentina, responds to variations in oceanic conditions and prey resources. We combined habitat and species distribution modeling with isotopic dietary reconstructions based on blood d13C and d15N values to quantify the role of bathymetry, sea-surface temperature and chlorophyll-a concentration, abundance of conspecifics, and extent of fisheries activities in explaining the foraging and feeding ecology of individuals breeding at different colonies. The at-sea distribution of penguins was tightly coupled with the spatial distribution of their staple prey species, anchovies (Engraulis anchoita), especially in areas over the continental shelf (.200 m depth), with relatively warm water (from 168 to 218C), and moderate abundances of conspecifics (from 50 to 250 individuals). Competition with conspecifics and human fisheries were also identified as important factors explaining penguin diet with decreasing relative contributions of anchovies with increasing abundance of conspecifics and fishing activity. Our multifactorial approach allowed us to simultaneously explore different physical, biological and anthropogenic features likely affecting marine resource availability, and, consequently, driving the feeding and foraging ecology of this central-place forager. Our approach can be extended to a large suite of central-place foragers, thus providing important advances in the way we investigate how to effectively conserve and manage these species.
Palabras clave: Magellanic Penguins , Patagonia , Stables Isotopes , Indicator Species
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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)
Identificadores
URI: http://hdl.handle.net/11336/7711
DOI: http://dx.doi.org/10.1890/ES13-00297.1
URL: http://onlinelibrary.wiley.com/wol1/doi/10.1890/ES13-00297.1/abstract
Colecciones
Articulos(CCT-CENPAT)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CENPAT
Citación
Ramírez, Francisco; Afán, Isabel; Hobson, Keith A.; Bertellotti, Nestor Marcelo; Blanco, Guillermo; et al.; Natural and anthropogenic factors affecting the feeding ecology of a top marine predator, the Magellanic penguin; Wiley; Ecosphere; 5; 4; 1-4-2014; 1-21
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