Abundance of bottlenose dolphins, Tursiops truncatus (Cetacea: Delphinidae), inhabiting the Patos Lagoon estuary, southern Brazil: Implications for conservation
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da FURG (RI FURG) |
Texto Completo: | http://repositorio.furg.br/handle/1/3579 |
Resumo: | 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. |
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Fruet, Pedro FriedrichSecchi, Eduardo ResendeDi Tullio, Juliana CoutoKinas, Paul Gerhard2013-06-19T18:00:24Z2013-06-19T18:00:24Z2011FRUET, 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: <http://www.scielo.br/pdf/zool/v28n1/v28n1a04.pdf>. Acesso em: 19 fev. 2013.1984-4670http://repositorio.furg.br/handle/1/357910.1590/S1984-46702011000100004A 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.engCetaceansMark-recapturePhotoidentificationAbundance of bottlenose dolphins, Tursiops truncatus (Cetacea: Delphinidae), inhabiting the Patos Lagoon estuary, southern Brazil: Implications for conservationinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da FURG (RI FURG)instname:Universidade Federal do Rio Grande (FURG)instacron:FURGORIGINALAbundance estimation of bottlenose dolphins, Tursiops truncatus (Cetacea, Delphinidae), inhabiting the Patos Lagoon estuary, sou.pdfAbundance estimation of bottlenose dolphins, Tursiops truncatus (Cetacea, Delphinidae), inhabiting the Patos Lagoon estuary, sou.pdfapplication/pdf611422https://repositorio.furg.br/bitstream/1/3579/1/Abundance%20estimation%20of%20bottlenose%20dolphins%2c%20Tursiops%20truncatus%20%28Cetacea%2c%20Delphinidae%29%2c%20inhabiting%20the%20Patos%20Lagoon%20estuary%2c%20sou.pdf149416ef4af4a5307961d447ed3c2a0cMD51open accessLICENSElicense.txtlicense.txttext/plain; charset=utf-81678https://repositorio.furg.br/bitstream/1/3579/2/license.txtd3be63d3b3eee02729709361dac69efeMD52open access1/35792013-06-19 15:00:24.99open accessoai:repositorio.furg.br:1/357977+9IG5lY2Vzc++/vXJpbyBjb25jb3JkYXIgY29tIGEgbGljZW7vv71hIGRlIGRpc3RyaWJ1ae+/ve+/vW8gbu+/vW8tZXhjbHVzaXZhLAphbnRlcyBxdWUgbyBkb2N1bWVudG8gcG9zc2EgYXBhcmVjZXIgbm8gUmVwb3NpdO+/vXJpby4gUG9yIGZhdm9yLCBsZWlhIGEKbGljZW7vv71hIGF0ZW50YW1lbnRlLiBDYXNvIG5lY2Vzc2l0ZSBkZSBhbGd1bSBlc2NsYXJlY2ltZW50byBlbnRyZSBlbQpjb250YXRvIGF0cmF277+9cyBkZTogcmVwb3NpdG9yaW9AZnVyZy5iciBvdSAweHggNTMgMzIzMy02NzA2LgoKTElDRU7vv71BIERFIERJU1RSSUJVSe+/ve+/vU8gTu+/vU8tRVhDTFVTSVZBCgpBbyBhc3NpbmFyIGUgZW50cmVnYXIgZXN0YSBsaWNlbu+/vWEsIG8vYSBTci4vU3JhLiAoYXV0b3Igb3UgZGV0ZW50b3IgZG9zIGRpcmVpdG9zIGRlIGF1dG9yKToKCmEpIENvbmNlZGUg77+9IFVuaXZlcnNpZGFkZSBGZWRlcmFsIGRlIFJpbyBHcmFuZGUgLSAgRlVSRyBvIGRpcmVpdG8gbu+/vW8tZXhjbHVzaXZvIGRlIHJlcHJvZHV6aXIsIGNvbnZlcnRlciAoY29tbyBkZWZpbmlkbyBhYmFpeG8pLCBjb211bmljYXIgZS9vdSBkaXN0cmlidWlyIG8gZG9jdW1lbnRvIGVudHJlZ3VlIChpbmNsdWluZG8gbyByZXN1bW8vYWJzdHJhY3QpIGVtCmZvcm1hdG8gZGlnaXRhbCBvdSBpbXByZXNzbyBlIGVtIHF1YWxxdWVyIG1laW8uCgpiKSBEZWNsYXJhIHF1ZSBvIGRvY3VtZW50byBlbnRyZWd1ZSDvv70gc2V1IHRyYWJhbGhvIG9yaWdpbmFsLCBlIHF1ZQpkZXTvv71tIG8gZGlyZWl0byBkZSBjb25jZWRlciBvcyBkaXJlaXRvcyBjb250aWRvcyBuZXN0YSBsaWNlbu+/vWEuIERlY2xhcmEgdGFtYu+/vW0gcXVlIGEgZW50cmVnYSBkbyBkb2N1bWVudG8gbu+/vW8gaW5mcmluZ2UsIHRhbnRvIHF1YW50byBsaGUg77+9IHBvc3Pvv712ZWwgc2FiZXIsIG9zIGRpcmVpdG9zIGRlIHF1YWxxdWVyIG91dHJhIHBlc3NvYSBvdSBlbnRpZGFkZS4KCmMpIFNlIG8gZG9jdW1lbnRvIGVudHJlZ3VlIGNvbnTvv71tIG1hdGVyaWFsIGRvIHF1YWwgbu+/vW8gZGV077+9bSBvcwpkaXJlaXRvcyBkZSBhdXRvciwgZGVjbGFyYSBxdWUgb2J0ZXZlIGF1dG9yaXph77+977+9byBkbyBkZXRlbnRvciBkb3MKZGlyZWl0b3MgZGUgYXV0b3IgcGFyYSBjb25jZWRlciDvv70gRlVSRyBvcyBkaXJlaXRvcyByZXF1ZXJpZG9zIHBvciBlc3RhIGxpY2Vu77+9YSwgZSBxdWUgZXNzZSBtYXRlcmlhbCBjdWpvcyBkaXJlaXRvcyBz77+9byBkZSB0ZXJjZWlyb3MgZXN077+9IGNsYXJhbWVudGUgaWRlbnRpZmljYWRvIGUgcmVjb25oZWNpZG8gbm8gdGV4dG8gb3UgY29udGXvv71kbyBkbyBkb2N1bWVudG8gZW50cmVndWUuCgpTZSBvIGRvY3VtZW50byBlbnRyZWd1ZSDvv70gYmFzZWFkbyBlbSB0cmFiYWxobyBmaW5hbmNpYWRvIG91IGFwb2lhZG8KcG9yIG91dHJhIGluc3RpdHVp77+977+9byBxdWUgbu+/vW8gYSBGVVJHLCBkZWNsYXJhIHF1ZSBjdW1wcml1IHF1YWlzcXVlciBvYnJpZ2Hvv73vv71lcyBleGlnaWRhcyBwZWxvIHJlc3BlY3Rpdm8gY29udHJhdG8gb3UgYWNvcmRvLgoKQSBGVVJHIGlkZW50aWZpY2Fy77+9IGNsYXJhbWVudGUgbyhzKSBzZXUgKHMpIG5vbWUgKHMpIGNvbW8gbyAocykgYXV0b3IgKGVzKSBvdSBkZXRlbnRvciAoZXMpIGRvcyBkaXJlaXRvcyBkbyBkb2N1bWVudG8gZW50cmVndWUsIGUgbu+/vW8gZmFy77+9IHF1YWxxdWVyIGFsdGVyYe+/ve+/vW8sIHBhcmEgYWzvv71tIGRhcyBwZXJtaXRpZGFzIHBvciBlc3RhIGxpY2Vu77+9YS4KRepositório InstitucionalPUBhttps://repositorio.furg.br/oai/request || http://200.19.254.174/oai/requestopendoar:2013-06-19T18:00:24Repositório Institucional da FURG (RI FURG) - Universidade Federal do Rio Grande (FURG)false |
dc.title.pt_BR.fl_str_mv |
Abundance of bottlenose dolphins, Tursiops truncatus (Cetacea: Delphinidae), inhabiting the Patos Lagoon estuary, southern Brazil: Implications for conservation |
title |
Abundance of bottlenose dolphins, Tursiops truncatus (Cetacea: Delphinidae), inhabiting the Patos Lagoon estuary, southern Brazil: Implications for conservation |
spellingShingle |
Abundance of bottlenose dolphins, Tursiops truncatus (Cetacea: Delphinidae), inhabiting the Patos Lagoon estuary, southern Brazil: Implications for conservation Fruet, Pedro Friedrich Cetaceans Mark-recapture Photoidentification |
title_short |
Abundance of bottlenose dolphins, Tursiops truncatus (Cetacea: Delphinidae), inhabiting the Patos Lagoon estuary, southern Brazil: Implications for conservation |
title_full |
Abundance of bottlenose dolphins, Tursiops truncatus (Cetacea: Delphinidae), inhabiting the Patos Lagoon estuary, southern Brazil: Implications for conservation |
title_fullStr |
Abundance of bottlenose dolphins, Tursiops truncatus (Cetacea: Delphinidae), inhabiting the Patos Lagoon estuary, southern Brazil: Implications for conservation |
title_full_unstemmed |
Abundance of bottlenose dolphins, Tursiops truncatus (Cetacea: Delphinidae), inhabiting the Patos Lagoon estuary, southern Brazil: Implications for conservation |
title_sort |
Abundance of bottlenose dolphins, Tursiops truncatus (Cetacea: Delphinidae), inhabiting the Patos Lagoon estuary, southern Brazil: Implications for conservation |
author |
Fruet, Pedro Friedrich |
author_facet |
Fruet, Pedro Friedrich Secchi, Eduardo Resende Di Tullio, Juliana Couto Kinas, Paul Gerhard |
author_role |
author |
author2 |
Secchi, Eduardo Resende Di Tullio, Juliana Couto Kinas, Paul Gerhard |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Fruet, Pedro Friedrich Secchi, Eduardo Resende Di Tullio, Juliana Couto Kinas, Paul Gerhard |
dc.subject.por.fl_str_mv |
Cetaceans Mark-recapture Photoidentification |
topic |
Cetaceans Mark-recapture Photoidentification |
description |
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. |
publishDate |
2011 |
dc.date.issued.fl_str_mv |
2011 |
dc.date.accessioned.fl_str_mv |
2013-06-19T18:00:24Z |
dc.date.available.fl_str_mv |
2013-06-19T18:00:24Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
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: <http://www.scielo.br/pdf/zool/v28n1/v28n1a04.pdf>. Acesso em: 19 fev. 2013. |
dc.identifier.uri.fl_str_mv |
http://repositorio.furg.br/handle/1/3579 |
dc.identifier.issn.none.fl_str_mv |
1984-4670 |
dc.identifier.doi.pt_BR.fl_str_mv |
10.1590/S1984-46702011000100004 |
identifier_str_mv |
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: <http://www.scielo.br/pdf/zool/v28n1/v28n1a04.pdf>. Acesso em: 19 fev. 2013. 1984-4670 10.1590/S1984-46702011000100004 |
url |
http://repositorio.furg.br/handle/1/3579 |
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eng |
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eng |
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Universidade Federal do Rio Grande (FURG) |
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Repositório Institucional da FURG (RI FURG) |
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