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dc.contributor.author
Saporiti, Fabiana
dc.contributor.author
Bearhop, Stuart
dc.contributor.author
Vales, Damián Gustavo
dc.contributor.author
Silva, Laura
dc.contributor.author
Zenteno, Lisette
dc.contributor.author
Tavares, Mauricio
dc.contributor.author
Crespo, Enrique Alberto
dc.contributor.author
Cardona, Luis
dc.date.available
2017-09-22T18:39:33Z
dc.date.issued
2016-10
dc.identifier.citation
Saporiti, Fabiana; Bearhop, Stuart; Vales, Damián Gustavo; Silva, Laura; Zenteno, Lisette; et al.; Resource partitioning among air-breathing marine predators: are body size and mouth diameter the major determinants?; Wiley Blackwell Publishing, Inc; Marine Ecology-pubblicazioni Della Stazione Zoologica Di Napoli I; 37; 5; 10-2016; 957–969
dc.identifier.issn
0173-9565
dc.identifier.uri
http://hdl.handle.net/11336/24957
dc.description.abstract
Although the body size of consumers may be a determinant factor in structuring food webs, recent evidence indicates that body size may fail to fully explain differences in the resource use patterns of predators in some situations. Here we compared the trophic niche of three sympatric and sexually dimorphic airbreathing marine predators (the South American sea lion, Otaria flavescens, the South American fur seal, Arctocephalus australis, and the Magellanic penguin, Spheniscus magellanicus) in three areas of the Southwestern Atlantic Ocean (R ıo de la Plata and adjoining areas, Northern Patagonia and Southern Patagonia), in order to assess the importance of body size and mouth diameter in determining resource partitioning. Body weight and palate/bill breadth were used to characterize the morphology of each sex and species, whereas the trophic niche was assessed through the use of stable isotope ratios of carbon and nitrogen. The quantitative method Stable Isotope Bayesian Ellipses in R (SIBER) was used to compute the area of the Bayesian ellipses and the overlap of the isotopic niches. The results showed that morphological similarity was significantly correlated with isotopic distance between groups within the d13C– d15N bi-plot space in the R ıo de la Plata area, but not in Northern and Southern Patagonia. Furthermore, resource partitioning between groups changed regionally, and some morphologically distinct groups exhibited a large trophic overlap in certain areas, such as the case of male penguins and male sea lions in Southern Patagonia. Conversely, female sea lions always overlapped with the much larger males of the same species, but never overlapped with the morphologically similar male fur seals. These results indicate that body size and mouth diameter are just two of the factors involved in resource partitioning within the guild of air-breathing predators considered here, and for whom – under certain environmental conditions – other factors are more important than morphology.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Arctocephalus Australis
dc.subject
Otaria Flavescens
dc.subject
Spheniscus Magellanicus
dc.subject
Stable Isotope Bayesian Ellipses in R
dc.subject
Body Size
dc.subject
Stable Isotopes
dc.subject.classification
Bioquímica y Biología Molecular
dc.subject.classification
Ciencias Biológicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Resource partitioning among air-breathing marine predators: are body size and mouth diameter the major determinants?
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-06-30T13:28:54Z
dc.journal.volume
37
dc.journal.number
5
dc.journal.pagination
957–969
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Saporiti, Fabiana. Universidad de Barcelona; España
dc.description.fil
Fil: Bearhop, Stuart. University Of Exeter; Reino Unido
dc.description.fil
Fil: Vales, Damián Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
dc.description.fil
Fil: Silva, Laura. Universidade Federal do Rio Grande do Sul; Brasil
dc.description.fil
Fil: Zenteno, Lisette. Universidad de Barcelona; España
dc.description.fil
Fil: Tavares, Mauricio. Universidade Federal do Rio Grande do Sul; Brasil
dc.description.fil
Fil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia; Argentina
dc.description.fil
Fil: Cardona, Luis. Universidad de Barcelona; España
dc.journal.title
Marine Ecology-pubblicazioni Della Stazione Zoologica Di Napoli I
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1111/maec.12304
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1111/maec.12304/abstract
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