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dc.contributor.authorMartin, Anthony Richard-
dc.contributor.authorSilva, Vera Maria Ferreira da-
dc.date.accessioned2020-06-15T22:03:01Z-
dc.date.available2020-06-15T22:03:01Z-
dc.date.issued2006-
dc.identifier.urihttps://repositorio.inpa.gov.br/handle/1/18786-
dc.description.abstractMeasurements and quantitative descriptions of a large sample of live adult botos (Inia geoffrensis) were obtained from the Mamirauá Reserve in the central Amazon. Males were on average 16% longer and weighed 55% more than females, demonstrating that this species is one of the most sexually dimorphic of all cetaceans for size. Males were also pinker than females, more heavily scarred by intraspecific tooth rakes, and had more life-threatening injuries. Some larger males had areas of modified skin that may simply be scar tissue, but may also be a heritable characteristic used as a shield or weapon. As in sperm whales, sexual size dimorphism and male-male aggression appear to be linked in botos, suggesting fierce competition for a resource - probably mating opportunities. The boto is unique among river dolphins in that males are larger than females. This distinction implies long evolutionary separation and fundamental differences in social behavior. © 2006 by the Society for Marine Mammalogy.en
dc.language.isoenpt_BR
dc.relation.ispartofVolume 22, Número 1, Pags. 25-33pt_BR
dc.rightsRestrito*
dc.subjectCetaceanen
dc.subjectColoren
dc.subjectSexual Dimorphismen
dc.subjectAmazon Riveren
dc.subjectAmazonasen
dc.subjectBrasilen
dc.subjectMamiraua Sustainable Development Reserveen
dc.subjectSouth Americaen
dc.subjectCetaceaen
dc.subjectDolphin (cetacean)en
dc.subjectInia Geoffrensisen
dc.subjectMammaliaen
dc.subjectPhyseteridaeen
dc.titleSexual dimorphism and body scarring in the boto (Amazon river dolphin) Inia geoffrensisen
dc.typeArtigopt_BR
dc.identifier.doi10.1016/j.jhydrol.2005.10.040-
dc.publisher.journalMarine Mammal Sciencept_BR
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