Cuidado onde pisa: poças temporárias têm importante papel na ecologia de peixes em igarapés de terra firme na Amazônia
Disturbances, either natural or anthropogenic, are common in nature and their effects on biological communities depend on disturbance characteristics, and on organisms’ and landscapes’ attributes. In this thesis, we evaluated the importance of seasonal variation in hydrodynamic characteristics an...
| Autor principal: | Espírito Santo, Helder Mateus Viana |
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| Grau: | Tese |
| 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/1/12224 http://lattes.cnpq.br/6941336635055338 |
| Resumo: |
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Disturbances, either natural or anthropogenic, are common in nature and their effects on biological
communities depend on disturbance characteristics, and on organisms’ and landscapes’ attributes.
In this thesis, we evaluated the importance of seasonal variation in hydrodynamic characteristics
and of temporary environments for the dynamics of fish communities in Amazonian terra-firme
forest streams, regionally known as igarapés. Through field studies in Adolpho Ducke Forest
Reserve (Manaus, Brazil), we obtained information on temporal variation of fish abundance in
stream channel and temporary ponds, as well as details of life-history traits of species and
movement patterns of individual fish. In addition, we measured environmental characteristics
related to the hydrology of the stream-pond systems and evaluated the responses of the fish to
temporal changes in the environment. Based on abundance data and using a community approach,
we show that the seasonal use of temporary ponds minimizes the temporal variability of assemblage
composition through its effect on the abundance of fish species. We also show that the hydrological
fluctuations regulate the distribution of species between the two habitats (temporary ponds and
stream channel) and that this abundance partition is strongly associated with the use of different
reproductive strategies among fish species. Finally, based on a capture-marking-recapture
experiment with a common and abundant species in the stream-pond system (Pyrrhulina brevis,
Lebiasinidae), we show that decisions of fish regarding the timing of entry and exit of ponds are
based on a refined perception of momentary hydrological conditions, integrating environmental
information accumulated over time. The combination of these results indicate that the aquatic
environment seasonally available in the riparian zone of terra-firme forest streams comprises an
important habitat for several species of fish, with important role in population processes and
organization of communities, as well as being a possible agent in the evolution of behavioral and
life history traits of fish in this ecosystem. |