Social organization of marine Tucuxi dolphins, Sotalia guianensis, in the Cananeia Estuary of southeastern Brazil

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dc.contributor.authorDe Oliveira Santos, Marcos Cesar [UNESP]
dc.contributor.authorRosso, Sergio
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2013-09-30T19:15:55Z
dc.date.accessioned2014-05-20T13:59:27Z
dc.date.available2013-09-30T19:15:55Z
dc.date.available2014-05-20T13:59:27Z
dc.date.issued2008-04-01
dc.description.abstractSocial organization is an important component of the population biology of a species that influences gene flow, the spatial pattern and scale of movements, and the effects of predation or exploitation by humans. An important element of social structure in mammals is group fidelity, which can be quantified through association indices. To describe the social organization of marine tucuxi dolphins (Sotalia guianensis) found in the Cananeia estuary, southeastern Brazil, association indices were applied to photo-identification data to characterize the temporal stability of relationships among members of this population. Eighty-seven days of fieldwork were conducted from May 2000 to July 2003, resulting in direct observations of 374 distinct groups. A total of 138 dolphins were identified on 1-38 distinct field days. Lone dolphins were rarely seen, whereas groups were composed of up to 60 individuals (mean +/- 1 SD = 12.4 +/- 11.4 individuals per group). A total of 29,327 photographs were analyzed, of which 6,312 (21.5%) were considered useful for identifying individuals. Half-weight and simple ratio indices were used to investigate associations among S. guianensis as revealed by the entire data set, data from the core study site, and data from groups composed of <= 10 individuals. Monte Carlo methods indicated that only 3 (9.3%) of 32 association matrices differed significantly from expectations based on random association. Thus, our study suggests that stable associations are not characteristic of S. guianensis in the Cananeia estuary.en
dc.description.affiliationProjeto Atlantis, Laboratório de Biologia da Conservação de Cetáceos, Departamento de Zoologia, Instituto de Biociências da Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Campus Rio Claro, Avenida 24-A, 1.515, Bela Vista, Rio Claro, São Paulo 13506-900, Brasil (MCOS)
dc.description.affiliationUniv São Paulo, Inst Biociencias, Dept Ecol, Lab Ecol Marinha, BR-05508900 São Paulo, Brazil
dc.description.affiliationUnespProjeto Atlantis, Laboratório de Biologia da Conservação de Cetáceos, Departamento de Zoologia, Instituto de Biociências da Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Campus Rio Claro, Avenida 24-A, 1.515, Bela Vista, Rio Claro, São Paulo 13506-900, Brasil (MCOS)
dc.format.extent347-355
dc.identifierhttp://dx.doi.org/10.1644/07-MAMM-A-090R2.1
dc.identifier.citationJournal of Mammalogy. Lawrence: Alliance Communications Group Division Allen Press, v. 89, n. 2, p. 347-355, 2008.
dc.identifier.doi10.1644/07-MAMM-A-090R2.1
dc.identifier.issn0022-2372
dc.identifier.urihttp://hdl.handle.net/11449/21085
dc.identifier.wosWOS:000255306200008
dc.language.isoeng
dc.publisherAlliance Communications Group Division Allen Press
dc.relation.ispartofJournal of Mammalogy
dc.relation.ispartofjcr2.139
dc.relation.ispartofsjr1,136
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectassociation indicesen
dc.subjectphoto-identificationen
dc.subjectsocial organizationen
dc.subjectSotalia guianensisen
dc.titleSocial organization of marine Tucuxi dolphins, Sotalia guianensis, in the Cananeia Estuary of southeastern Brazilen
dc.typeArtigo
dcterms.licensehttp://www.bioone.org/page/terms_of_use
dcterms.rightsHolderAlliance Communications Group Division Allen Press
unesp.author.orcid0000-0002-6642-2658[1]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Rio Claropt

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Artigos - Biologia - IBRC