Show simple item record Fruet, Pedro Friedrich Secchi, Eduardo Resende Di Tullio, Juliana Couto Kinas, Paul Gerhard 2013-06-19T18:00:24Z 2013-06-19T18:00:24Z 2011
dc.identifier.citation FRUET, Pedro Friedrich et al. Abundance estimation of bottlenose dolphins, Tursiops truncatus (Cetacea, Delphinidae), inhabiting the Patos Lagoon estuary, southern Brazil: implications for conservation. Revista Brasileira de Zoologia, v. 28, n. 1, p. 23-30, 2011. Disponível em: <>. Acesso em: 19 fev. 2013. pt_BR
dc.identifier.issn 1984-4670
dc.description.abstract A new mark-recapture abundance estimate and a photographic census were carried out to investigate the possible decline in the abundance of the bottlenose dolphins, Tursiops truncatus (Montagu, 1821), in the Patos Lagoon estuary due to the high levels of bycatch mortality which occurred between 2002 and 2006 in oceanic coastal areas close to the estuary. Fourteen systematic boat surveys were conducted between August and early December 2005 to photo-identify the bottlenose dolphins. The estimated number of animals, with long-lasting marks, in the population obtained from Chapman's and Mth models were 51 (95% CI = 49-53) and 52 (95% CI = 51-60), respectively. Taking into account the proportion of dolphins with long-lasting marks in the population, the total estimated population size ranged between 84 (95% CI = 76-93) and 86 (95% CI = 78-95) individuals, respectively, which was very similar to the 84 individuals revealed by the population census. Our results did not differ from the abundance estimate carried out in 1998, prior to the high fishing-related mortality event, suggesting that the population is stable. Plausible argument to explain the stability of the population is that some carcasses found on the oceanic coastal beaches near Patos Lagoon estuary come from animals that do not belong to the estuary community. Future studies should investigate fine-scale habitat partition between estuarine and adjacent coastal dolphins. If the existence of different communities living in close proximity (estuarine and coastal areas near to the estuary) is confirmed, a new abundance estimate is needed to access the conservation status of bottlenose dolphins in this region. pt_BR
dc.language.iso eng pt_BR
dc.rights open access pt_BR
dc.subject Cetaceans pt_BR
dc.subject Mark-recapture pt_BR
dc.subject Photoidentification pt_BR
dc.title Abundance of bottlenose dolphins, Tursiops truncatus (Cetacea: Delphinidae), inhabiting the Patos Lagoon estuary, southern Brazil: Implications for conservation pt_BR
dc.type article pt_BR
dc.identifier.doi 10.1590/S1984-46702011000100004 pt_BR

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