Segregation of diets by sex and individual in South American fur seals

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Autor(es): dc.contributorUniversidade Federal do Rio Grande (FURG)-
Autor(es): dc.contributorUniversidad de la República-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorde Lima, Renan C.-
Autor(es): dc.creatorFranco-Trecu, Valentina-
Autor(es): dc.creatorCarrasco, Thayara S.-
Autor(es): dc.creatorInchausti, Pablo-
Autor(es): dc.creatorSecchi, Eduardo R.-
Autor(es): dc.creatorBotta, Silvina-
Data de aceite: dc.date.accessioned2025-08-21T16:23:59Z-
Data de disponibilização: dc.date.available2025-08-21T16:23:59Z-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2022-03-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1007/s10452-021-09915-9-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/222639-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/222639-
Descrição: dc.descriptionTrophic niche width and individual specialization among marine predators are often subjected to seasonal constraints. Differences are expected to arise for sexually dimorphic species exposed to distinct ecological opportunities, as well as intrinsic differences in physiological abilities or energetic requirements. We assess seasonal and sexual differences in isotopic niche overlap and width and analyze inter-individual foraging variation throughout the year of the South American fur seal (Arctocephalus australis). We obtained chronologically ordered δ13C and δ15N data from vibrissae of 25 males and 24 females from southern Brazil and Uruguay. There were significant differences between sexes for both isotopes with males showing higher values (δ13C = − 14.5 ± 0.5‰; δ15N = 18.9 ± 1.2‰) than females (δ13C = − 15.2 ± 0.5‰; δ15N = 17.8 ± 1.2‰), but not among seasons or years. A very small isotopic niche overlap found between sexes (1.1–9.5%), with limited seasonal variation, likely resulted from differences in prey consumption and foraging habitats. Compared to other seasons, females had a wider isotopic niche in spring. While males showed seasonal stability in the foraging niche, females showed some small variation, which is probably influenced by central place foraging. Both sexes had considerable interindividual variation in estimated dietary composition and had different proportions of potential prey contribution at the population level. These findings enlighten the knowledge of South American fur seal trophic ecology, and how they may seasonally and spatially shift their foraging strategies according to their distinct life histories. It ultimately reflects in a small niche partitioning and possibly low intraspecific competition at the species northernmost area of occurrence in the western South Atlantic.-
Descrição: dc.descriptionAgencia Nacional de Investigación e Innovación-
Descrição: dc.descriptionPrograma de Pós-Graduação em Oceanografia Biológica Instituto de Oceanografia Universidade Federal do Rio Grande (FURG)-
Descrição: dc.descriptionLaboratório de Ecologia e Conservação da Megafauna Marinha (ECOMEGA) Instituto de Oceanografia Universidade Federal do Rio Grande (FURG)-
Descrição: dc.descriptionDepartamento de Ecología y Evolución Facultad de Ciencias Universidad de la República-
Descrição: dc.descriptionPrograma de Pós-Graduação em Biodiversidade de Ambientes Costeiros Instituto de Biociências Universidade Estadual Paulista (UNESP)-
Descrição: dc.descriptionLaboratório de Estratigrafia e Paleontologia Instituto de Biociências Universidade Estadual Paulista (UNESP)-
Descrição: dc.descriptionCentro Universitario Regional del Este Universidad de la República-
Descrição: dc.descriptionPrograma de Pós-Graduação em Biodiversidade de Ambientes Costeiros Instituto de Biociências Universidade Estadual Paulista (UNESP)-
Descrição: dc.descriptionLaboratório de Estratigrafia e Paleontologia Instituto de Biociências Universidade Estadual Paulista (UNESP)-
Formato: dc.format251-267-
Idioma: dc.languageen-
Relação: dc.relationAquatic Ecology-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectArctocephalus australis-
Palavras-chave: dc.subjectAtlantic Ocean-
Palavras-chave: dc.subjectForaging habits-
Palavras-chave: dc.subjectIndividual specialization-
Palavras-chave: dc.subjectIsotopic niche-
Título: dc.titleSegregation of diets by sex and individual in South American fur seals-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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