Contribuição de espécies ornamentais para a estrutura funcional de assembleias de peixes de igarapés do médio rio negro, Amazônia Brasileira
The study of biodiversity through its functional facet brings advantages related to the understanding of the structuring mechanisms, the relationships between the species and their respective ecosystemic roles, and the prediction of changes in biological services in the face of environmental chan...
| Autor principal: | Castanho, Danilo Gabriel da Rocha |
|---|---|
| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
|
| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/11279 http://lattes.cnpq.br/9850252906496511 |
| Resumo: |
|---|
|
The study of biodiversity through its functional facet brings advantages related to
the understanding of the structuring mechanisms, the relationships between the
species and their respective ecosystemic roles, and the prediction of changes in
biological services in the face of environmental changes. One of the main sources
of pressures on natural fish populations in the Amazon is fishing, which has been
more intensively carried out over the last decades. Seeing that the ornamental
fishery carried out in the middle portion of the Negro River basin is an extractive
activity focused on certain species, it is possible that the pressure exerted by the
activity generates disturbances in the functional structure of the communities and
suppresses specific ecological functions. With this scenario, the present study
sought to estimate the effects of ornamental fishing on the functional structure of
streams fish assemblages, through the elaboration of hypothetical scenarios of
subtraction of abundances of ornamental and non - ornamental species. Through
the evaluation of three complementary functional indexes (Redundancy,
Divergence and Functional Dispersion) we found that the assemblies studied
have high functional diversity related to the use of the environment and food
resources. The species exploited by ornamental fisheries contribute significantly
to the functional redundancy of the assemblages, and the simulated withdrawal
of the Tetra cardinal Paracheirodon axelrodi causes greater losses to the
assembly than the removal of non-ornamental species. These results indicate
that the activity should be performed in an orderly manner and with adequate
management, in order not to spoil the functional structure of local fish
assemblages. As the activity does not generate significant changes in the
physical and chemical conditions of the environment, and that economic
unfeasibility decreases the chances of local extinction, ornamental fishery in the
Barcelos region is prone to remain viable without altering the stability of the
ecosystem. |