O efeito de poluentes urbanos nos padrões de descarga de Microsternarchus sp. (Gymnotiformes).
The order Gymnotiformes is endemic of the Neotropical region and has, among other peculiarities, the capacity to generate and detect alternate electric currents, with an aid of a system that encompasses both electrogenic and electroreceptor cells, respectively. By means of this electrogenic and e...
| Autor principal: | Nunes Filho, Dalton Moreira |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/11391 http://lattes.cnpq.br/0456914463560245 |
| Resumo: |
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The order Gymnotiformes is endemic of the Neotropical region and has, among
other peculiarities, the capacity to generate and detect alternate electric currents,
with an aid of a system that encompasses both electrogenic and electroreceptor
cells, respectively. By means of this electrogenic and electrosensory system, these
fish are able to communicate and to electrolocate in several types of habitats,
including under the absence of light. Several studies have demonstrated the potential
use of these fish as environmental biomonitors, once the patterns of the electric
organ discharge may change, depending upon the physic-chemical properties of the
surrounding water. This study had as objective to analyze the effect of polluted water
from an urban stream of Manaus in the discharge patterns of Microsternarchus sp.
Three concentration of pollution were used, beyond the control treatment. The
experiments lasted seven hours, divided into two hours of acclimation, one hour of
pre-test and four hours of exposition to the polluted water. The discharge patterns
were monitored at 15 minutes intervals, and each observation (recording of the
discharge) lasted five seconds. The results indicate that the stream studied
(Matrinxã) is severely affected by urban pollution. The fish show significant and dosedependent variation in their discharge patterns during the exposition time. The
treatment with the highest concentration pollution level provoked a detectable change
in the discharge pattern within two and half hours of exposition. The genus
Microsternarchus appears as a good model for biomonitoring tests. |