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Isotopic niche partitioning between two apex predators over time

dc.creatorDrago, Massimiliano
dc.creatorCardona, Luis
dc.creatorFranco Trecu, Valentina
dc.creatorCrespo, Enrique Alberto
dc.creatorVales, Damián Gustavo
dc.creatorBorella, Florencia
dc.creatorZenteno, Lisette
dc.creatorGonzáles, Enrique M.
dc.creatorInchausti, Pablo
dc.date2017-03
dc.date.accessioned2021-04-06T18:33:03Z
dc.date.available2021-04-06T18:33:03Z
dc.identifierDrago, Massimiliano; Cardona, Luis; Franco Trecu, Valentina; Crespo, Enrique Alberto; Vales, Damián Gustavo; et al.; Isotopic niche partitioning between two apex predators over time; Wiley Blackwell Publishing, Inc; Journal Of Animal Ecology; 86; 4; 3-2017; 1-15
dc.identifier0021-8790
dc.identifierhttp://hdl.handle.net/11336/43496
dc.identifierCONICET Digital
dc.identifierCONICET
dc.identifier.urihttp://suquia.ffyh.unc.edu.ar/handle/11336/43496
dc.description1. Stable isotope analyses have become an important tool in reconstructing diets, analyzing resource use patterns, elucidating trophic relations among predators and understanding the structure of food webs.<br />2. Here, we use stable carbon and nitrogen isotope ratios in bone collagen to reconstruct and compare the isotopic niches of adult South American fur seals (Arctocephalus australis; n = 86) and sea lions (Otaria flavescens; n = 49) ?two otariid species with marked morphological differences? in the Río de la Plata estuary (Argentina - Uruguay) and the adjacent Atlantic Ocean during the second half of the 20th century and the beginning of the 21st century. Samples from the middle Holocene (n = 7 fur seals and n = 5 sea lions) are also included in order to provide a reference point for characterizing resource partitioning before major anthropogenic modifications of the environment.<br />3. We found that the South American fur seals and South American sea lions had distinct isotopic niches during the middle Holocene. Isotopic niche segregation was similar at the beginning of the second half of the 20th century, but has diminished over time.<br />4. The progressive convergence of the isotopic niches of these two otariids during the second half of the 20th century and the beginning of the 21st century is most likely due to the increased reliance of South American fur seals on demersal prey.<br />5. This recent dietary change of South American fur seals can be explained by at least two non-mutually exclusive mechanisms: (i) the decrease in the abundance of sympatric South American sea lions as a consequence of small colony size and high pup mortality resulting from commercial sealing; and (ii) the decrease in the average size of demersal fishes due to intense fishing of the larger class sizes, which may have increased their accessibility to those eared seals with a smaller mouth gape, i.e., South American fur seals of both sexes and female South American sea lions.
dc.descriptionFil: Drago, Massimiliano. Universidad de la República; Uruguay
dc.descriptionFil: Cardona, Luis. Universidad de Barcelona; España
dc.descriptionFil: Franco Trecu, Valentina. Universidad de la República; Uruguay
dc.descriptionFil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
dc.descriptionFil: Vales, Damián Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
dc.descriptionFil: Borella, Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Investigaciones Arqueológicas y Paleontológicas del Cuaternario Pampeano. Universidad Nacional del Centro de la Provincia de Buenos Aires. Investigaciones Arqueológicas y Paleontológicas del Cuaternario Pampeano; Argentina
dc.descriptionFil: Zenteno, Lisette. Universidad de Barcelona; España
dc.descriptionFil: Gonzáles, Enrique M.. Museo Nacional de Historia Natural; Uruguay
dc.descriptionFil: Inchausti, Pablo. Universidad de la República; Uruguay
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dc.languageeng
dc.publisherWiley Blackwell Publishing, Inc
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/10.1111/1365-2656.12666
dc.relationinfo:eu-repo/semantics/altIdentifier/url/https://besjournals.onlinelibrary.wiley.com/doi/abs/10.1111/1365-2656.12666
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subjectMARINE MAMMALS
dc.subjectPINNIPEDS
dc.subjectSTABLE ISOTOPES
dc.subjectSTANDARD ELLIPSE AREA
dc.subjectTROPHIC ECOLOGY
dc.subjectOtras Ciencias Biológicas
dc.subjectCiencias Biológicas
dc.subjectCIENCIAS NATURALES Y EXACTAS
dc.titleIsotopic niche partitioning between two apex predators over time
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:ar-repo/semantics/artículo
dc.typeinfo:eu-repo/semantics/publishedVersion


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