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dc.contributor.author
Franco Trecu, Valentina  
dc.contributor.author
Botta, Silvina  
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de Lima, Renan C.  
dc.contributor.author
Negrete, Javier  
dc.contributor.author
Naya, Daniel E.  
dc.date.available
2023-06-26T17:59:18Z  
dc.date.issued
2022-06  
dc.identifier.citation
Franco Trecu, Valentina; Botta, Silvina; de Lima, Renan C.; Negrete, Javier; Naya, Daniel E.; Testing the niche variation hypothesis in pinnipeds; Wiley Blackwell Publishing, Inc; Mammal Review; 52; 4; 6-2022; 497-506  
dc.identifier.issn
0305-1838  
dc.identifier.uri
http://hdl.handle.net/11336/201572  
dc.description.abstract
Individual trophic specialisation (ITS) has many important consequences for ecological and evolutionary processes. An old hypothesis highlighting the relevance of ITS is the niche variation hypothesis (NVH), which proposes that populations composed of trophically specialised individuals have a wider population niche than populations composed of more generalist individuals. Pinnipeds are a good model to test the NVH because they are mostly generalist species, living in dense colonies, and exhibiting variation in trophic niche width among populations. We tested the NVH in pinnipeds using longitudinal isotopic data: published δ13C and δ15N data obtained from sequential sections of whiskers (vibrissae) from individuals belonging to 14 populations. To the best of our knowledge, this is the first study evaluating the NVH by using longitudinal isotopic data. We compiled studies that published raw data on δ13C and δ15N for pinniped whisker segments to estimate the within-individual and the between-individuals components of variance, the total niche width (TNW), and ITS. One-dimensional (i.e. δ13C or δ15N) and multi-dimensional (i.e. δ13C and δ15N) analyses were used. Also, we tested whether an evolutionary component would affect the degree of ITS among pinniped species with different levels of shared ancestry. Our results indicate that, in line with the NVH, pinniped populations composed of more specialised individuals tend to show wider trophic niches. When analysing each sex separately, the hypothesis is supported for females but not for males. We believe that physiological and behavioural differences between sexes may explain this result. In females, high TNW is mainly related to greater differentiation among individuals, while in males, it is mainly related to high diversity of resources consumed by all individuals.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Wiley Blackwell Publishing, Inc  
dc.rights
info:eu-repo/semantics/restrictedAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
GLOBAL  
dc.subject
INDIVIDUAL TROPHIC SPECIALISATION  
dc.subject
PINNIPEDS  
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STABLE ISOTOPE ANALYSIS  
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TOTAL NICHE WIDTH  
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VIBRISSAE  
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WHISKERS  
dc.subject.classification
Ecología  
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Ciencias Biológicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Testing the niche variation hypothesis in pinnipeds  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2023-06-26T16:15:20Z  
dc.journal.volume
52  
dc.journal.number
4  
dc.journal.pagination
497-506  
dc.journal.pais
Reino Unido  
dc.journal.ciudad
Londres  
dc.description.fil
Fil: Franco Trecu, Valentina. Universidad de la Republica; Uruguay  
dc.description.fil
Fil: Botta, Silvina. Universidade Federal do Rio Grande; Brasil  
dc.description.fil
Fil: de Lima, Renan C.. Universidade Federal do Rio Grande; Brasil  
dc.description.fil
Fil: Negrete, Javier. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina  
dc.description.fil
Fil: Naya, Daniel E.. Universidad de la Republica; Uruguay  
dc.journal.title
Mammal Review  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1111/mam.12297