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Human-induced injuries to marine tucuxis (Sotalia guianensis) (Cetacea: Delphinidae) in Brazil

Published online by Cambridge University Press:  03 March 2009

Alexandre F. Azevedo*
Affiliation:
Laboratório de Mamíferos Aquáticos (MAQUA), Faculdade de Oceanografia, UERJ, Rua São Francisco Xavier 524, Maracanã, Rio de Janeiro, 20550-013, Brazil
José Lailson-Brito
Affiliation:
Laboratório de Mamíferos Aquáticos (MAQUA), Faculdade de Oceanografia, UERJ, Rua São Francisco Xavier 524, Maracanã, Rio de Janeiro, 20550-013, Brazil
Paulo R. Dorneles
Affiliation:
Laboratório de Mamíferos Aquáticos (MAQUA), Faculdade de Oceanografia, UERJ, Rua São Francisco Xavier 524, Maracanã, Rio de Janeiro, 20550-013, Brazil Laboratório de Radioisótopos, UFRJ, Brazil
Monique van Sluys
Affiliation:
PPGEE/IBRAG, Departamento de Ecologia, UERJ, Brazil
Haydée A. Cunha
Affiliation:
Laboratório de Mamíferos Aquáticos (MAQUA), Faculdade de Oceanografia, UERJ, Rua São Francisco Xavier 524, Maracanã, Rio de Janeiro, 20550-013, Brazil Laboratório de Biodiversidade Molecular, UFRJ, Brazil
Ana B.L. Fragoso
Affiliation:
Laboratório de Mamíferos Aquáticos (MAQUA), Faculdade de Oceanografia, UERJ, Rua São Francisco Xavier 524, Maracanã, Rio de Janeiro, 20550-013, Brazil
*
Correspondence should be addressed to: Alexandre F. Azevedo, Laboratório de Mamíferos Aquáticos (MAQUA), Faculdade de Oceanografia, UERJ, Rua São Francisco Xavier 524, Maracanã, Rio de Janeiro, 20550-013, Brazil email: azevedo.alex@uerj.br
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Abstract

Guanabara Bay constitutes the most degraded habitat along the marine tucuxi dolphin (Sotalia guianensis) distribution. Considering that these mammals are found year-round in this area, where the dolphin population is estimated to be approximately 70 individuals, interactions between cetaceans and human activities are of concern. From 1995 to 2005, photo-identification techniques have been employed to study marine tucuxis in Guanabara Bay and data on the individual injuries has been collected. Seven out of 78 photo-identified and catalogued individuals presented noticeable injuries on their bodies, including cut-like wounds, skin ulceration and mutilation. Parts of fishing gear attached to the bodies of some dolphins were also observed. The concern elicited by the injuries reported here is amplified if we consider that this cetacean population is highly exposed to contaminants of known immunosuppressive action, such as organochlorine, organotin and perfluoroalkyl compounds.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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References

REFERENCES

Azevedo, A.F., Lailson-Brito, J. Jr, Cunha, H.A. and Van Sluys, M. (2004) A note on site fidelity of marine tucuxis (Sotalia fluviatilis) in Guanabara Bay, south-eastern Brazil. Journal of Cetacean Research and Management 6, 265268.CrossRefGoogle Scholar
Azevedo, A.F., Oliveira, A.M., Viana, S.C. and Van Sluys, M. (2007) Habitat use by marine tucuxis (Sotalia guianensis) (Cetacea: Delphinidae) in Guanabara Bay, south-eastern Brazil. Journal of the Marine Biological Association of the United Kingdom 87, 201205.CrossRefGoogle Scholar
Azevedo, A.F., Viana, S.C., Oliveira, A.M. and Van Sluys, M. (2005) Group characteristics of marine tucuxis (Sotalia fluviatilis) (Cetacea: Delphinidae) in Guanabara Bay, south-eastern Brazil. Journal of the Marine Biological Association of the United Kingdom 85, 209212.CrossRefGoogle Scholar
Baker, G.B. and Wise, B.S. (2005) The impact of pelagic longline fishing on the flesh-footed shearwater Puffinus carneips in eastern Australia. Biological Conservation 126, 306316.CrossRefGoogle Scholar
Beineke, A., Siebert, U., McLachlan, M., Bruhn, R., Thron, K., Failing, K., Müller, G. and Baumgartner, W. (2005) Investigations of the potential influence of environmental contaminants on the thymus and spleen of harbour porpoises (Phocoena phocoena). Environmental Science and Technology 39, 39333938.CrossRefGoogle Scholar
Chan, E.H., Liew, H.C. and Mazlan, A.G. (1988) The incidental capture of sea turtles in fishing gear in Terengganu, Malaysia. Biological Conservation 43, 17.CrossRefGoogle Scholar
Cunha, H.A., Silva, V.M.F. da, Lailson-Brito, J., Santos, M.C.O., Flores, P.A.C., Martin, A.R., Azevedo, A.F., Fragoso, A.B.L., Zanelatto, R.C. and Solé-Cava, A.M. (2005) Riverine and marine ecotypes of Sotalia dolphins are different species. Marine Biology 148, 449457.CrossRefGoogle Scholar
Domeles, P.R., Lailson-Brito, J., Azevedo, A.F., Meyer, J., Vidal, L.G., Fragoso, A.B.L., Torres, J.P.M., Malm, O., Blust, R. and Das, K. (2008) High accumulation of perfluorooctane sulfonate (PFOS) in marine tucuxi dolphins (Sotalia guianensis) from Brazilian coast. Environmental Science and Technology 42, 53685373.Google Scholar
Dorneles, P.R., Lailson-Brito, J., Fernandez, M.A.S., Vidal, L.G., Barbosa, L.A., Azevedo, A.F., Fragoso, A.B.L., Torres, J.P.M. and Malm, O. (2008) Evaluation of cetacean exposure to organotin compounds in Brazilian waters through hepatic total tin concentrations. Environmental Pollution. doi: 10.1016/j.envpol.2008.03.007.CrossRefGoogle ScholarPubMed
Dorneles, P.R., Lailson-Brito, J., Santos, R.A., Costa, P.A.S., Malm, O., Azevedo, A.F. and Torres, J.P.M. (2007) Cephalopods and cetaceans as indicators of offshore bioavailability of cadmium off central south Brazil Bight. Environmental Pollution 148, 352359.CrossRefGoogle ScholarPubMed
Flores, P.A.C. (2002) Tucuxi Sotalia fluviatilis. In Perrin, W.F. et al. (eds) Encyclopedia of marine mammals. San Diego: Academic Press, pp. 12671269.Google Scholar
Jablonski, S., Azevedo, A.F. and Moreira, L.H.A. (2006) Fisheries and conflicts in Guanabara Bay, Rio de Janeiro, Brazil. Brazilian Archives of Biology and Technology 49, 7991.CrossRefGoogle Scholar
Kjerfve, B., Ribeiro, C.H.A., Dias, G.T.M., Filippo, A.M. and Quaresma, V.S. (1997) Oceanographic characteristics of an impacted coastal bay: Baía de Guanabara, Rio de Janeiro, Brazil. Continental Shelf Research 17, 16091643.CrossRefGoogle Scholar
Lailson-Brito, J. Jr (2007) Bioacumulação de mercúrio, selênio e organoclorados (DDT, PCB e HCB) em cetáceos (Mammalia, Cetacea) da costa sudeste e sul do Brasil. PhD thesis, Universidade Federal do Rio de Janeiro, Brazil.Google Scholar
Laist, D.W. (1987) Overview of the biological effects of lost and discarded plastic debris in the marine environment. Marine Pollution Bulletin 18, 319326.CrossRefGoogle Scholar
López, A., Pierce, G.J., Santos, M.B., Gracia, J. and Guerra, A. (2003) Fishery by-catches of marine mammals in Galician waters: results from on-board observations and an interview survey of fishermen. Biological Conservation 111, 2540.CrossRefGoogle Scholar
Norman, F.I. (2000) Preliminary investigation of the bycatch of marine birds and mammals in inshore commercial fisheries, Victoria, Australia. Biological Conservation 92, 217226.CrossRefGoogle Scholar
Peden-Adams, M.M., EuDaly, J.G., Dabra, S., EuDaly, A., Heesemann, L., Smythe, J. and Keil, D.E. (2007) Suppression of humoral immunity following exposure to the perfluorinated insecticide sulfluramid. Journal of Toxicology and Environmental Health, Part A 70, 11301141.CrossRefGoogle Scholar
Perin, G., Fabris, R., Manente, S., Rabello-Wagener, A., Hamacher, C. and Scotto, S.A. (1997) Five-year study on the heavy-metal pollution of Guanabara Bay sediments (Rio de Janeiro, Brazil) and evaluation of the metal bioavailability by means of geochemical speciation. Water Research 31, 30173028.CrossRefGoogle Scholar
Perrin, W.F., Donovan, G.P. and Barlow, J. (1994) Mortality of cetaceans in passive fishing nets and traps. Cambridge: Histon. [Reports of the International Whaling Commission, no 15.]Google Scholar
Reeves, R.R., Smith, B.D., Crespo, E.A. and Notarbartolo di Sciara, G. (2003) Dolphins, whales and porpoises—2002–2010: conservation action plan for the world's cetaceans, IUCN/SSC Cetacean Specialist Group. Cambridge: Gland.CrossRefGoogle Scholar
Silva, V.M.F. da and Best, R.C. (1996) Sotalia fluviatilis. Mammalian Species 527, 17.Google Scholar
Torres, J.P., Lailson-Brito, J. Jr, Dorneles, P.R., Azevedo e Silva, C.E., Azeredo, A., Meire, R.O., Vidal, L., Lozinski, C., Azevedo, A.F. and Malm, O. (2006) Organochlorines in blubber of marine tucuxi dolphin, Sotalia guianensis, from Rio de Janeiro coastal bays, Brazil. Organohalogen Compounds 68, 580582.Google Scholar
Whalen, M.M., Green, S.A. and Loganathan, B.G. (2002) Brief butyltin exposure induces irreversible inhibition of the cytotoxic function on human natural killer cells, in vitro. Environmental Research 88, 1929.CrossRefGoogle ScholarPubMed
World Health Organization (WHO) (2002) Global assessment of the state-of-the-science of endocrine disruptors. Geneva, Switzerland: International Programme on Chemical Safety.Google Scholar