, Volume 770, Issue 1, pp 89–104 | Cite as

The human dimension of the conflict between fishermen and South American sea lions in southern Brazil

  • Ana Carolina Pont
  • Silvio Marchini
  • Mônica Tais Engel
  • Rodrigo Machado
  • Paulo Henrique Ott
  • Enrique A. Crespo
  • Mariano Coscarella
  • Marina Schmidt Dalzochio
  • Larissa Rosa de Oliveira
Primary Research Paper


We analysed the fishermen’s perceptions on the South American sea lions (Otaria flavescens) and its interactions with the local fishery close to the Wildlife Refuge of Ilha dos Lobos, a marine protected area in southern Brazil. Sea lions prey upon the same resources targeted by the fishermen. They repeatedly hunt on the nets and consequently damage them. In response, fishermen persecute sea lions. However, in conflicts with high-profile animals, the perceived damage often exceeds the actual evidence. Results from 100 interviews revealed that fishermen’s perception of damage and their attitudes were affected by age, hierarchical position in the crew, if fishing was the only source of income, and level of formal education. Greater perception of damage and more negative attitude were found among older, less educated sailor fishermen who had no other source of income besides fishing. The average fisherman had a relatively good knowledge about sea lions, but also a negative attitude towards them. We recommend actions addressing these negative attitudes through environmental education, with emphasis on adjusting exaggerated perceptions of impact and the potential of the species for wildlife tourism, as a vital step towards the conciliation of sustainable fisheries and O. flavescens conservation in the Brazilian coast.


Human–wildlife conflict Fishing interaction Fishermen’s perception Fishermen’s attitude Otaria flavescens 



The authors would like to thank all the fishermen from Torres and Passo de Torres, specially to Z18 association and Adriano Delfino Joaquim, that made this study possible. We are also grateful to Cádiz Sustainable Ideas Awards (Prêmio Cádiz Ideias Sustentáveis), Amnéville Zoo and Fundação Grupo O Boticário de Proteção à Natureza, for the financial support. The authors are in debt with: Shirley Pacheco for the valuable comments and suggestions, Fernando Lopes for the map, Fabrícia Barbieri and Francine Shultz for their collaboration during the project, Karina Groch and Paulo André de Carvalho Flores for providing the aerial photographs of the WRIL, Valentina Franco-Trecu and Diana Szteren for providing sea lions information from Uruguay, Dr. Stephen P. Kirkman, who kindly reviewed the final version of the manuscript and the anonymous referees for suggestions that significantly improved this manuscript. The Coordination for the Improvement of Higher Education Personnel (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—CAPES) provided a scholar Master’s grant (PROSUP) to ACP and RM. The Brazilian National Council for Scientific and Technological Development (Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq) provide the Research Productivity grants No. 303813/2011-3 and 308650/2014-0 to LRO.


  1. Aguilar, A. & L. Lowry, 2013. Monachus monachus. In The IUCN Red List of Threatened Species Version 2014.2. Available on internet at http://www.iucnredlist.org.
  2. Ajzen, I., 2002. Perceived behavioral control, self-efficacy, locus of control, and the theory of planned behavior. Journal of Applied Social Psychology 32: 665–683.CrossRefGoogle Scholar
  3. Barbieri, F., R. Machado, C. A. Zappes & L. R. Oliveira, 2012. Interactions between the Neotropical otter (Lontra longicaudis) and gillnet fishery in the southern Brazilian coast. Ocean Coastal Management 63: 16–23.CrossRefGoogle Scholar
  4. Bordino, P., S. Kraus, D. Albareda, A. Fazio, A. Palmerio, M. Mendez & S. Botta, 2002. Reducing incidental mortality of Franciscana dolphin Pontoporia blainvillei with acoustic warning devices attached to fishing nets. Marine Mammal Science 18: 833–842.CrossRefGoogle Scholar
  5. Burnham, K. P. & D. R. Anderson, 2002. Model Selection and Multimodel Inference. Springer, New York.Google Scholar
  6. Butler, J. R. A., S. J. Middlemas, I. M. Graham & R. N. Harris, 2011. Perceptions and costs of seal impacts on Atlantic salmon fisheries in the Moray Firth, Scotland: implications for the adaptive co-management of seal-fishery conflict. Marine Policy 35: 317–323.CrossRefGoogle Scholar
  7. Cardoso, L. G. & M. Haimovici, 2011. Caracterização tecnológica, social, econômica e ecológica da atividade pesqueira sediada em Passo de Torres, Santa Catarina. Boletim do Instituto de Pesca 37: 275–288.Google Scholar
  8. Conover, M., 2002. Resolving Human-Wildlife Conflicts: The Science of Wildlife Damage Management. CRC Press, Florida.Google Scholar
  9. Crespo, E. A., D. Oliva, S. L. Dans & M. Sepúlveda, 2012. Current Status of the South American Sea Lion Along the Distribution Range. University of Valparaíso, Valparaíso.Google Scholar
  10. De María, M., F. R. Barboza & D. Szteren, 2013. Predation of South American sea lion (Otaria flavescens) on artisinal fisheries in Rio de la Plata estuary. Fisheries Research 149: 69–73.CrossRefGoogle Scholar
  11. Dickman, A. J., S. Marchini & M. Manfredo, 2013. The importance of the human dimension in addressing conflict with large carnivores. In Macdonald, D. W. & K. J. Willis (eds), Key Topics in Conservation Biology. Wiley, Oxford: 110–126.CrossRefGoogle Scholar
  12. Engel, M. T., S. Marchini, A. C. Pont, R. Machado & L. R. Oliveira, 2014. Perceptions and attitudes of stakeholders towards the wildlife refuge of Ilha dos Lobos, a marine protected area in Brazil. Marine Policy 45: 45–51.CrossRefGoogle Scholar
  13. Franco-Trecu, V., 2015. Tácticas comportamentales de forrajeo y apareamiento y dinâmica poblacional de dos especies de otáridos simpátricas con tendências poblacionales contrastantes. PhD Thesis. Universidad de la República Montevideo, Uruguay.Google Scholar
  14. Franco-Trecu, V., P. Costa, C. Abud, C. Dimitriadis, P. Laporta, C. Passadore & M. Szephegyi, 2009. By-catch of franciscana Pontoporia blainvillei in uruguayan artisanal gillnet fisheries: an evaluation after a twelve-year gap in data collection. Latin American Journal of Aquatic Mammals 7: 11–22.CrossRefGoogle Scholar
  15. Glain, D., S. Kotomatas & S. Adamantopoulou, 2001. Fishermen and seal conservation: survey of attitudes towards monk seals in Greece and grey seals. Mammalia 65: 309–317.CrossRefGoogle Scholar
  16. Gliesh, R., 1925. A fauna de Torres. Revista de Engenharia de Porto Alegre 10: 253–354.Google Scholar
  17. Graham, I. M., R. N. Harris, I. Matejusova & S. J. Middlemas, 2011. Do ‘rogue’ seal exist? Implications for seal conservation in the UK. Animal Conservation 14: 587–598.CrossRefGoogle Scholar
  18. Haimovici, M., S. S. Martins & P. C. Vieira, 1996. Distribuição e abundância de peixes teleósteos demersais sobre a plataforma continental do sul do Brasil. Revista Brasileira de Biologia 56: 27–50.Google Scholar
  19. Hale, R., R. Pires, P. Santos & A. A. Karamanlidis, 2011. Mediterranean Monk Seal (Monachus monachus): fishery Interactions in the Archipelago of Madeira. Aquatic Mammals 37: 298–304.CrossRefGoogle Scholar
  20. Harris, R. N., 2012. Marine Mammals and Salmon Bag-Nets. Report to Marine Scotland, Scotland.Google Scholar
  21. Harris, R. N., C. M. Harris, C. D. Duck & I. L. Boyd, 2014. The effectiveness of a seal scarer at a wild salmon net fishery. ICES Journal of Marine Science 71: 1913–1920.CrossRefGoogle Scholar
  22. Huntington, H. P., 2000. Using traditional ecological knowledge in science: methods and applications. Ecological Applications 10: 1270–1274.CrossRefGoogle Scholar
  23. Isaac, V. J. M., A. S. Martins, M. Haimovici, J. P. Castello & J. M. Andriguetto, 2006. Síntese do estado de conhecimento sobre a pesca marinha e estuarina do Brasil. In Isaac, V. J., A. S. Martins, M. Haimovici & J. M. Andriguetto Filho (eds), A pesca Marinha e Estuarina do Brasil no Início do século XXI: Recursos Tecnologias, Aspectos Sócioeconômicos e Institucionais. Universitária UFPA, Belém: 181–188.Google Scholar
  24. IUCN—International Union for Conservation of Nature, 2014. Red List of Threatened Species: Version 2012.2: Otaria flavescens. Available on internet at http://www.iucnredlist.org/details/41665/0.
  25. Kamradt, T. F. & E. J. Kamradt, 1999. Structured design for attitudinal instruction. In Reigeluth, C. M. (ed.), Instructional-Design Theories and Models: A New Paradigm of Instructional Theory. Lawrence Erlbaum Associates Publishing, Mahwah: 563–590.Google Scholar
  26. Kastelein, R., J. Kershaw, E. Berghout & P. Wiepkema, 1995. The food consumption of South American sea lions (Otaria flavescens). Aquatic Mammals 21: 43–53.Google Scholar
  27. Konigson, S., A. Fjalling, M. Berglind & S. Lunneryd, 2013. Male gray seals specialize in raiding salmon traps. Fisheries Research 148: 117–123.CrossRefGoogle Scholar
  28. Lavigne, D. M., 2003. Marine mammals and fisheries: the role of science in the culling debate. In Gales, N., M. Hindell & R. Kirkwood (eds), Marine Mammals: Fisheries; Tourism and Management Issues. CSIRO Publishing, Victoria: 31–47.Google Scholar
  29. Machado, R., 2013. Conflito entre o leão-marinho-sul-americano (Otaria flavescens) e a pesca costeira de emalhe no sul do Brasil: uma análise ecológica e econômica. M.S. Thesis. Universidade do Vale do Rio dos Sinos - Unisinos. São Leopoldo.Google Scholar
  30. Machado, R., M. Tavares, D. Danilewicz, P. H. Ott, I. B. Moreno & L. R. Oliveira, 2012. Mortalidade de Otaria flavescens no sul do Brasil: evidências de conflitos com a pesca. In Abstracts of 15ª Reunión de Trabajo de Expertos en Mamíferos Acuáticos de América del Sur and 9º Congreso SOLAMAC. Puerto Madryn.Google Scholar
  31. Machado, R., L. R. Oliveira & S. Q. Montealegre, 2015a. Incidental catch of South American sea lion in a pair trawl off Southern Brazil. Neotropical Biology Conservation 10: 43–47.Google Scholar
  32. Machado, R., P. H. Ott, I. B. Moreno, D. Danilewicz, M. Tavares, E. A. Crespo, S. Siciliano & L. R. Oliveira, 2015b. Operational interactions between South American sea lions and gillnet fishing in southern Brazil. Aquatic Conservation: Marine and Freshwater Ecosystems. doi: 10.1002/aqc.2554.Google Scholar
  33. Manfredo, M. J., 2008. Who Cares About Wildlife? Social Science Concepts for Exploring Human-Wildlife Relationships and Conservation Issues. Springer, Fort Collins.Google Scholar
  34. Marchini, S. & D. W. Macdonald, 2012. Predicting ranchers’ intention to kill jaguars: case studies in Amazonia and Pantanal. Biological Conservation 147: 213–221.CrossRefGoogle Scholar
  35. Matos, A., 2001. A pesca de bagre na Lagoa de Tramandaí e RS. Relatório Técnico do Departamento de Pesca da Secretaria Municipal do Meio Ambiente, Pesca e Agricultura e SMAPA. Prefeitura Municipal de Tramandaí—RS.Google Scholar
  36. McCullagh, P. & J. A. Nelder, 1989. Generalized Linear Models, 2nd ed. Chapman and Hall, London.CrossRefGoogle Scholar
  37. Moreno, I. B., M. Tavares, D. Danilewicz, P. H. Ott & R. Machado, 2009. Descrição da pesca costeira de média escala no litoral norte do Rio Grande do Sul: comunidades pesqueiras de Imbé/Tramandaí e Passo de Torres/Torres. Boletim do Instituto de Pesca 35: 129–140.Google Scholar
  38. MMA—Ministério do Meio Ambiente. 2007. Áreas Prioritárias para Conservação, Uso Sustentável e Repartição de Benefícios da Biodiversidade Brasileira: Atualização - Portaria MMA n°9, de 23 de janeiro de 2007. Ministério do Meio Ambiente, Secretaria de Biodiversidade e Florestas. Série Biodiversidade: 31.Google Scholar
  39. Newing, H., 2011. Conducting Research in Conservation: A Social Science Perspective. Routledge, New York.Google Scholar
  40. Oksanen, J., R. Kindt, P. Legendre, B. O’Hara, G. L. Simpson, P. Solymos, M. H. H. Stevens & H. Wagner, 2009. Vegan: Community Ecology Package. Available on internet at http://cran.r-project.org/.
  41. Oliveira, L. R., 2013. Canívoros marinhos. In Weber, M. M., C. Roman & N. C. Cáceres (eds), Mamıíferos do Rio Grande do Sul. Santa Maria. Editora UFSM, Santa Maria: 405–427.Google Scholar
  42. Oliveira, L. R., P. H. Ott & L. R. Malabarba, 2008. Ecologia alimentar dos pinípedes no sul do Brasil e uma avaliação de suas interações com atividades pesqueiras. In Reis, N. R., A. L. Peracchi & G. A. S. D. Santos (eds), Ecologia de Mamíferos. Technical Books, Londrina: 93–112.Google Scholar
  43. Páez, H., 2005. Situación de la administración del recurso lobos y leones marinos en Uruguay. In Menafra, R., L. Rodríguez-Gallego, F. Scarabino & D. Conde (eds), Bases para la Conservación y el Manejo de la Costa Uruguaya. Vida Silvestre, Sociedad Uruguaya para la Conservación de la Naturaleza, Montevideo: 577–583Google Scholar
  44. Pinedo, M. C., 1990. Ocorrência de Pinípedes na costa brasileira. Garcia de Orta—Serie Zoologia 15: 37–48.Google Scholar
  45. R Core Team, 2013. R: A Language and Environment for Statistical Computing. R Foundation for Statistical Computing, Vienna. Available on internet at http://www.R-project.org/.
  46. Rosas, F. C. W., M. C. Pinedo, M. Marmotel & M. Haimovici, 1994. Seasonal movements of the South American sea lion (Otaria flavescens Shaw, 1800) of the Rio Grande do Sul coast, Brazil. Mammalia 58: 51–59.CrossRefGoogle Scholar
  47. Sanfelice, D., V. C. Vasques & E. A. Crespo, 1999. Ocupação sazonal por duas espécies de Otariidae (Mammalia, Carnivora) da Reserva Ecológica Ilha dos Lobos, Rio Grande do Sul, Brasil. Iheringia Série Zoologia 87: 101–110.Google Scholar
  48. Sepúlveda, M. & D. Oliva, 2005. Interactions between South American sea lions Otaria flavescens (Shaw) and salmon farms in southern Chile. Aquaculture Research 36: 1062–1068.CrossRefGoogle Scholar
  49. Sepúlveda, M., M. J. Pérez, W. Sielfeld, D. Oliva, L. R. Durán, L. Rodríguez, V. Araos & M. Buscaglia, 2007. Operational interactions between South American sea lions Otaria flavescens and artisanal (small-scale) fishing in Chile: results from interview surveys and on-board observations. Fisheries Research 83: 332–340.CrossRefGoogle Scholar
  50. Shaw, G. 1800. Seals. In General Zoology or Systematic Natural History, vol 1, Part 2. Kearsley, London: 260–261.Google Scholar
  51. Silva, M., 2005. The Brazilian protected areas program. Conservation Biology 19: 608–611.CrossRefGoogle Scholar
  52. Simões-Lopes, P. C., C. J. Drehmer & P. H. Ott, 1995. Nota sobre os Otariidae e Phocidae (Mammalia: Carnivora) da costa norte do Rio Grande do Sul e Santa Catarina, Brasil. Biociências 3: 173–181.Google Scholar
  53. Simões-Lopes, P. C., M. E. Fábian & J. O. Menegheti, 1998. Dolphin interactions with the mullet artisanal fisheries on Southern Brazil: a qualitative and quantitative approach. Revista Brasileira de Zoologia 15: 709–726.CrossRefGoogle Scholar
  54. Szteren, D. & E. Páez, 2002. Predation by southern sea lions (Otaria flavescens) on artisanal fishing catches in Uruguay. Marine and Freshwater Research 53: 1161–1167.CrossRefGoogle Scholar
  55. Swim, J., S. Clayton, T. Doherty, R. Gifford, G. Howard, J. Reser, P. Stern & E. Weber, 2009. Psychology and global climate change: addressing a multi-faceted phenomenon and set of challenges. Available on internet at http://www.apa.org/science/about/publications/climate-change.aspx.
  56. Vaske, J. J., 2008. Survey Research and Analysis: Applications in Parks, Recreation and Human Dimensions. Venture Publishing Inc., Pennsylvania.Google Scholar
  57. Vaske, J. J. & M. P. Donnely, 1999. A value-attitude-behavior model predicting wildland preservation voting intentions. Society and Natural Resources 12: 523–537.CrossRefGoogle Scholar
  58. Vaz-Ferreira, R., 1982a. Otaria flavescens (Shaw): South American sea lion. Mammals in the Seas. FAO Fisheries series 4: 477–495.Google Scholar
  59. Vaz-Ferreira, R., 1982b. Arctocephalus australis (Zimmermann): South American fur seal. Mammals in the Seas, FAO Fisheries series 4: 497–508.Google Scholar
  60. White, P. C. L., N. V. Jennings, A. R. Renwick & N. H. L. Barker, 2005. Questionnaires in ecology: a review of past use and recommendations for best practice. Journal of Applied Ecology 42: 421–430.CrossRefGoogle Scholar
  61. Wickens, P. A., 1995. A review of operational interactions between pinnipeds and fisheries. FAO Fisheries Technical Paper 346: 86.Google Scholar
  62. Ximenez, I. M. & E. Langguth, 2002. Isla de Lobos. Graphis, Uruguay.Google Scholar
  63. Zappes, C. A., A. Andriolo, P. C. Simões-Lopes & A. P. M. Di Beneditto, 2011. Human dolphin (Tursiops truncatus Montagu, 1821) cooperative fishery and its influence on cast net fishing activities in Barra de Imbé/Tramandaí, Southern Brazil. Ocean & Coastal Management 54: 427–432.CrossRefGoogle Scholar
  64. Zappes, C. A., C. V. Silva, M. Pontalti, M. L. Danielski & A. P. M. Di Beneditto, 2013. The conflict between the southern right whale and coastal fisheries on the southern coast of Brazil. Marine Policy 38: 428–437.CrossRefGoogle Scholar
  65. Zuur, A. F., E. N. Ieno, N. J. Walker, A. A. Saveliev & G. M. Smith, 2009. Mixed Effects Model and Extension in Ecology with R. Springer, New York.CrossRefGoogle Scholar

Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Ana Carolina Pont
    • 1
  • Silvio Marchini
    • 2
  • Mônica Tais Engel
    • 1
    • 3
  • Rodrigo Machado
    • 4
    • 5
  • Paulo Henrique Ott
    • 4
    • 6
  • Enrique A. Crespo
    • 7
  • Mariano Coscarella
    • 7
  • Marina Schmidt Dalzochio
    • 8
  • Larissa Rosa de Oliveira
    • 1
    • 4
  1. 1.Laboratório de Ecologia de MamíferosUniversidade do Vale do Rio dos SinosSão LeopoldoBrazil
  2. 2.Ciências Florestais Departamento, Luiz de Queiroz Faculdade de AgriculturaUniversidade de São PauloPiracicabaBrazil
  3. 3.Geography DepartmentMemorial UniversitySt. John’sCanada
  4. 4.Grupo de Estudos de Mamíferos Aquáticos do Rio Grande do SulOsórioBrazil
  5. 5.Pós-Graduação em Biologia AnimalUniversidade Federal do Rio Grande do Sul (UFRGS)Porto AlegreBrazil
  6. 6.Laboratório de Ecologia e Conservação de Organismos e Ambientes Aquáticos (ECOAqua)Universidade Estadual do Rio Grande do Sul (UERGS)OsórioBrazil
  7. 7.Laboratorio de Mamiferos MarinosCentro Nacional Patagonico (CENPAT-CONICET) and Universidad Nacional de la PatagoniaPuerto MadrynArgentina
  8. 8.Universidade Feevale, Pró-Reitoria de Assuntos Comunitários – PROACOMSão José, Novo HamburgoBrazil

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