UNUSUAL RESPONSES OF GUIANA DOLPHINS (SOTALIA GUIANENSIS) TO THE PRESENCE OF SWIMMERS AND BOATS

Respostas incomuns de botos-cinza (Sotalia guianensis) à presença de nadadores e embarcações

Autores/as

  • Livio Moreira de Gurjão Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis - IBAMA
  • Cinthya Leite de Oliveira Instituto de Ciências do Mar da Universidade Federal do Ceará-Labomar/UFC. Associação de Pesquisa e Preservação de Ecossistemas Aquáticos – AQUASIS
  • Heideger Lima do Nascimento Associação de Pesquisa e Preservação de Ecossistemas Aquáticos – AQUASIS
  • Vitor Luz Carvalho Associação de Pesquisa e Preservação de Ecossistemas Aquáticos – AQUASIS
  • Ana Carolina Oliveira de Meirelles Marine Mammal Research Unit, University of British Columbia

DOI:

https://doi.org/10.32360/acmar.v57i2.92318

Resumen

The Guiana dolphin, Sotalia guianensis, classified as 'Vulnerable' to extinction in Brazil, exhibits a particularly small population within Mucuripe embayment, Ceará state, Northeastern Brazil. This study investigated their behavioral responses from October 2019 to May 2021 as part of the environmental licensing requirements for dredging and land reclamation activities. Thirty-two boat surveys were conducted, with dolphins observed in 97% of them. Two 'unusual' responses to the presence of boats and swimmers were noted: a neutral reaction, when a group of five dolphins continued foraging despite nearby swimmers; and a positive response, when three dolphins deliberately approached the research boat, engaging in spy-hopping and sideways swimming, suggesting curiosity towards our presence. These unusual reactions highlight concerns regarding potential human-dolphin interactions in Mucuripe embayment, underscoring the need for continuous systematic monitoring. Such efforts are crucial to provide the appropriate subsidies aimed at preserving natural dolphin behaviors. 

Keywords: Cetaceans, marine mammals, endangered species, behavior, interactions, Mucuripe embayment.

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Publicado

2024-12-26

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Notas Científicas