Etnoecologia e captura acidental de golfinhos (Cetacea: Pontoporidae e Delphinidae) na Baía da Babitonga, Santa Catarina

Pinheiro, Luciana; Cremer, Marta Jussara

doi:10.5380/dma.v8i0.22053

Cited by 21 publications

(18 citation statements)

References 2 publications

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“…However, the animals collected in this study did not exhibit signs of disease and most likely died as a consequence of entanglement in fishing nets, which has been a problem in Babitonga Bay, as described by Pinheiro & Cremer (2003).…”

Section: Discussionmentioning

confidence: 67%

Use of carbon and nitrogen stable isotopes to study the feeding ecology of small coastal cetacean populations in southern Brazil

et al. 2013

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of carbon and nitrogen stable isotopes to study the feeding ecology of small coastal cetacean populations in southern Brazil. Biota Neotrop. 13(4): http://www.biotaneotropica.org.br/v13n4/en/abstract?article+bn01413042013Abstract: Samples from individuals of the populations of Sotalia guianensis (Guiana) and Pontoporia blainvillei (Franciscana) dolphins living in the Babitonga Bay estuary (26° 28' S/48° 50' W), and samples from individuals of a second population of P. blainvillei from a nearshore area (26° 38' S/48° 41' W), were collected and analyzed along with their prey between 2000 and 2006, to determine the carbon and nitrogen stable isotope ratios and to verify differences in their feeding ecology. No differences were found in the median ð 15 N values of Guiana (15.2‰) and Franciscana (15.9‰) dolphins living in Babitonga Bay, nor of nearshore Franciscana (15.0‰) individuals, suggesting no variation in the trophic level of these populations. However, the lack of more information on the isotopic compositions of their putative prey in the nearshore areas prevents the ability to draw definitive conclusions on this issue. The estuarine Franciscana and Guiana dolphin populations presented mean ð 13 C values of approximately -15.7‰, which were not statistically different from nearshore Franciscana individuals (-14.8‰). Based on stomach content analyses of these species from a previous study, it was reported that there was little overlap in the diet of estuarine Franciscanas and Guiana dolphins. However, based on the similarity of the ð 13 C values between these two species and of their putative prey, it appears that in fact there is an overlap in the diet of these two species. Based solely on stable isotope analysis, it was not possible to differentiate between estuarine and nearshore Franciscana populations, making it difficult to conclude whether captured nearshore specimens were indeed yearlong residents of these areas. Finally, this study suggests that Franciscana and Guiana dolphin populations are sharing the same resources, mostly L. brevis, D. rhombeus, and S. rastrifer. Therefore, the combination of resource sharing and commercial exploitation of their prey makes these two cetacean species vulnerable. Keywords: Pontoporia blainvillei, Sotalia guianensis, Babitonga Bay, feeding ecology, trophic level.HARDT, F.A.S., CREMER, M.J., TONELLO JUNIOR, A.J., BELLANTE, A., BUFFA, G., BUSCAINO, G., MAZZOLA, S., BARRETO, A.S., MARTINELLI, L.A. & ZUPPI, G.M. O uso dos isótopos estáveis de carbono e nitrogênio para o estudo da ecologia de populações de pequenos cetáceos costeiros no sul do Brasil. Biota Neotrop. 13(4): http://www.biotaneotropica.org.br/v13n4/pt/abstract?article+bn01413042013Resumo: Amostras de tecido de indivíduos pertencentes às populações de Sotalia guianensis (boto-cinza) e Pontoporia blainvillei (toninha) que vivem no estuário da Baía da Babitonga (26° 28' S/48° 50' W) e de uma segunda população de P. blainvillei da área costeira (26° 38' S/48° 41' W) foram coletadas entre os anos 2000 e 2006 para ...

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Section: Discussionmentioning

confidence: 67%

Use of carbon and nitrogen stable isotopes to study the feeding ecology of small coastal cetacean populations in southern Brazil

et al. 2013

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“…Cetaceans, classified as mammals by Linnaean taxonomy, are in fact members of life-form 'fish' in several folk taxonomies, such as those of fishers from Hong Kong, Solomon Islands, Brazilian Northeastern and Southeastern coasts [19,23,24,32]. The life-form 'fish' is characterized by different groups of animals that live in aquatic habitats, including fishes, aquatic invertebrates, turtles, crocodiles, dugongs, whales and dolphins [13,18,19,32]. Paz and Begossi [54] studying the folk taxonomy of fishes at Gamboa, (Sepetiba Bay, Southeastern Brazilian coast) also found that local dolphins are classified as an ethnospecies ('boto') belonging to the ethnofamily 'Cação' (sharks).…”

Section: Discussionmentioning

confidence: 99%

Whales, dolphins or fishes? The ethnotaxonomy of cetaceans in São Sebastião, Brazil

Souza

Begossi

2007

J Ethnobiology Ethnomedicine

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The local knowledge of human populations about the natural world has been addressed through ethnobiological studies, especially concerning resources uses and their management. Several criteria, such as morphology, ecology, behavior, utility and salience, have been used by local communities to classify plants and animals. Studies regarding fishers' knowledge on cetaceans in the world, especially in Brazil, began in the last decade. Our objective is to investigate the folk classification by fishers concerning cetaceans, and the contribution of fishers' local knowledge to the conservation of that group. In particular, we aim to record fishers' knowledge in relation to cetaceans, with emphasis on folk taxonomy. The studied area is São Sebastião, located in the southeastern coast of Brazil, where 70 fishers from 14 communities were selected according to their fishing experience and interviewed through questionnaires about classification, nomenclature and ecological aspects of local cetaceans' species. Our results indicated that most fishers classified cetaceans as belonging to the life-form 'fish'. Fishers' citations for the nomenclature of the 11 biological species (10 biological genera), resulted in 14 folk species (3 generic names). Fishers' taxonomy was influenced mostly by the phenotypic and cultural salience of the studied cetaceans. Cultural transmission, vertical and horizontal, was intimately linked to fishers' classification process. The most salient species, therefore well recognized and named, were those most often caught by gillnets, in addition to the biggest ones and those most exposed by media, through TV programs, which were watched and mentioned by fishers. Our results showed that fishers' ecological knowledge could be a valuable contribution to cetaceans' conservation, helping to determine areas and periods for their protection, indicating priority topics for research and participating in alternative management related to the gillnet fisheries.

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“…Despite the fact that Brazilian law forbids the use of fixed gillnets along the coast of Santa Catarina State (Portaria IBAMA 54/1999), the nets are used extensively. For Babitonga Bay, a specific law allows fishermen to use driftnets inside the bay (Portaria IBAMA 84/2002) throughout the year, and these nets are commonly used between October and November (PINHEIRO; CREMER, 2003). This kind of net is strongly related to incidental captures and could be considered a significant threat to this population.…”

Section: Resultsmentioning

confidence: 99%

Franciscana strandings on the north coast of Santa Catarina State and insights into birth period

et al. 2013

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Resumo Encalhes de toninhas no litoral norte de Santa Catarina e informações sobre o período de nascimento.A toninha (Pontoporia blainvillei) é o pequeno cetáceo mais ameaçado do Atlântico Sul Ocidental. A captura acidental em redes de pesca é o maior problema para esta espécie ao longo de sua distribuição. As toninhas mortas encontradas nas praias são uma importante fonte de informações. O objetivo deste trabalho foi analisar os registros de carcaças de toninhas encontradas mortas no litoral norte de Santa Catarina, incluindo a Baía da Babitonga. Entre janeiro de 2001 e novembro de 2012 foram registradas 54 carcaças de toninhas. Entre os meses de agosto e outubro foram registradas 28 carcaças (52%), sendo que o número mais elevado (oito indivíduos) foi encontrado em 2011. Levando em conta que estas informações não são decorrentes de um esforço sistematizado, não podemos considerar que esta seja uma estimativa de mortalidade. O maior animal registrado foi uma fêmea, com 142 cm de comprimento. Dentre os animais recuperados, 10 (18,5%) tinham comprimento total inferior a 80 cm, sendo considerados fetos ou filhotes. Estes registros indicam que o principal período de nascimento de toninhas em Santa Catarina é de outubro a janeiro. As informações aqui apresentadas contribuem para o conhecimento desta espécie no Estado. and November 2012, 54 franciscana carcasses were recorded, with the highest number (8 individuals) in 2011. Fifty-two percent (n=28) of the carcasses were recorded between August and October. Taking into account that this information was not obtained from a systematic effort, it was not possible to consider this as an estimation of mortality. The largest animal was a female, with a total length of 142 cm. Ten recovered animals (18.5%) were smaller than 80 cm, and were considered fetuses or calves. These records indicate that the main birthing period for franciscanas in Santa Catarina is between October and January. The findings presented here contribute to our knowledge of franciscana ecology in the state of Santa Catarina.

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Etnoecologia e captura acidental de golfinhos (Cetacea: Pontoporidae e Delphinidae) na Baía da Babitonga, Santa Catarina

Cited by 21 publications

References 2 publications

Use of carbon and nitrogen stable isotopes to study the feeding ecology of small coastal cetacean populations in southern Brazil

Use of carbon and nitrogen stable isotopes to study the feeding ecology of small coastal cetacean populations in southern Brazil

Whales, dolphins or fishes? The ethnotaxonomy of cetaceans in São Sebastião, Brazil

Franciscana strandings on the north coast of Santa Catarina State and insights into birth period

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