Avaliação da Toxicidade Subletal de Cianobactérias na Atividade Natatória de Organismos Aquáticos Através de Processamento de Imagem

Autores

  • Aloysio da S. Ferrão-Filho Laboratório de Avaliação e Promoção da Saúde Ambiental, Departamento de Biologia, Instituto Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, RJ, Brazil
  • R. Cunha Laboratório de Avaliação e Promoção da Saúde Ambiental, Departamento de Biologia, Instituto Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, RJ, Brazil
  • V. F. Magalhães Laboratório de Ecofisiologia e Toxicologia de Cianobactérias, Instituto de Biofísica Carlos Chagas Filho (CCS), Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, Brazil
  • M. C. S. Soares Laboratório de Ficologia, Departamento de Botânica, Museu Nacional, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, Brazil
  • D. F. Baptista Laboratório de Avaliação e Promoção da Saúde Ambiental, Departamento de Biologia, Instituto Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, RJ, Brazil

DOI:

https://doi.org/10.5132/jbse.2007.02.001

Palavras-chave:

Real-Time Biomoinitoring, toxic cyanobacteria, sub-lethal toxicity, saxitoxins, aquatic organisms

Resumo

This study evaluated the sub-lethal toxicity of cyanobacteria, especially Cylindrospermosis raciborskii, on Daphnia pulex (water-flea) and Danio rerio (fish), through automated image processing, with the aim to develop a Real-Time Biomonitoring System (RTBS) for detection of toxic cyanobacteria in water supplies. A system composed of a video camera coupled to an image analyzer (Videomex-V®) and to a computer was used to evaluate the swimming activities of D. rerio and D. pulex. The parameters ‘mean distance performed’ and ‘mean velocity’ were used as endpoints to evaluate the effect of samples of cyanobacteria cultures or to raw water from the eutrophic Funil Reservoir. Results showed that both cyanobacteria cultures and water samples from the reservoir altered the swimming activities of D. rerio, elevating the values of mean distance performed and mean velocity. For D. pulex, the cyanobacteria cells caused the opposite effect, decreasing the swimming activity parameters, which can be related to the mechanism of action of saxitoxins. It was concluded that this system can be efficiently used in the detection of toxic blooms of saxitoxin producing cyanobacteria in water supplies.

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Publicado

2007-07-10

Como Citar

Ferrão-Filho, A. da S., Cunha, R., Magalhães, V. F., Soares, M. C. S., & Baptista, D. F. (2007). Avaliação da Toxicidade Subletal de Cianobactérias na Atividade Natatória de Organismos Aquáticos Através de Processamento de Imagem. Ecotoxicology and Environmental Contamination, 2(2), 93–100. https://doi.org/10.5132/jbse.2007.02.001

Edição

v. 2 n. 2 (2007)

Seção

Artigos

Licença

Copyright (c) 2007 Ecotoxicology and Environmental Contamination

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Este trabalho está licenciado sob uma licença Creative Commons Attribution 4.0 International License.

Copyright © 2006 ECOTOX-Brasil

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