Organochlorine concentrations in franciscana dolphins, Pontoporia blainvillei, from Brazilian waters |
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Authors: | Lailson-Brito José Dorneles Paulo Renato Azevedo-Silva Cláudio Eduardo Azevedo Alexandre de Freitas Vidal Lara Gama Marigo Juliana Bertozzi Carolina Zanelatto Regina Célia Bisi Tatiana Lemos Malm Olaf Torres João Paulo Machado |
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Institution: | a Laboratório de Mamíferos Aquáticos e Bioindicadores ‘‘Profa. Izabel Gurgel’’ (MAQUA), Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524 sala 4002, 20550-013, Maracanã, Rio de Janeiro, RJ, Brazil b Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Av. Carlos Chagas Filho, 373 Sala G0-61, 21941-902 Rio de Janeiro, RJ, Brazil c Projeto Biopesca, Rua Paraguai, 241, Guilhermina, Praia Grande, SP, Brazil d Pró-Reitoria de Administração, UFPR, Curitiba, Brazil |
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Abstract: | Blubber samples were collected from ten franciscana dolphins either incidentally captured in fishing operations or stranded on São Paulo (SP) and Paraná (PR) states littoral, Southeastern and Southern Brazilian coast, respectively. Determination of PCB, DDT and HCB concentrations were performed by capillary gas chromatograph coupled to electron capture detector (ECD). ΣDDT, ΣPCB and HCB concentrations ranged from 264 ng g−1 to 5811 ng g−1 lipid, from 909 ng g−1 to 5849 ng g−1 lipid and from 10 ng g−1 to 61 ng g−1 lipid, respectively. Regarding DDTs, the distribution of the mean percentages decreased in the following order: p,p′-DDE > p,p′-DDD > p,p′-DDT. The ΣDDT/ΣPCB ratio varied between 0.27 and 0.42 in Northern and Central SP coast, while in Southern SP and PR coast the values were 1.6 and 1.9, respectively. Dissimilarities in ΣDDT/ΣPCB ratios point to different sources of organochlorine compounds to franciscana dolphins in the study area. Considering the endocrine disruptive action of organochlorine compounds, the concentrations found in franciscana dolphins from Brazilian waters may represent an additional obstacle to the conservation of this endangered cetacean species. |
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Keywords: | Cetacean Coastal waters DDT HCB PCB Pollution |
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