Banca de DEFESA: PABLO LÚCIO RUBIM COSTA DOS SANTOS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : PABLO LÚCIO RUBIM COSTA DOS SANTOS
DATA : 27/04/2018
HORA: 14:30
LOCAL: Sala de aulas do LARHISA
TÍTULO:

Effects of omnivorous planktivorous and benthivorous fish in tropical lakes

PALAVRAS-CHAVES:

Onivoria, biomanipulation, semiarid, reservoir, trophic cascades, nutrient cycling, eutrophication, fish. Prochilodus brevis, Oreochromis niloticus

PÁGINAS: 81
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
RESUMO:

Plankivorous and bentivorous fish are key drivers of phytoplankton biomass and water turbidity. Therefore, restoration techniques for eutrophic lakes based on the selective removal of these fish (or biomanipulation) have been developed and used with relative success in temperate lakes. The viability of these techniques in tropical lakes, however, is uncertain due to differences in fish communities in tropical and temperate lakes. For instance, in warmer lakes fish assemblages shows higher degree of omnivory. To evaluate the effects of omnivorous fish on phytoplanktonic biomass and turbidity in tropical lakes and their implications for biomanipulation, mesocosms experiments were conducted with two omnivorous species. Nile tilapia (Oreochromis niloticus Linnaeus 1758) is an exotic planktonic species that is able to filter-feeds on suspended particles, including phytoplankton and zooplankton. The curimatã (Prochilodus brevis Steindachner 1875) is a native bentivorous species that feeds on algae, detritus and microinvertebrates. The results of the experiments are presented in three chapters. The first chapter deals with the mechanisms by which each species affects planktonic production and water turbidity. The second chapter deals with the consequences of the interaction between the two species for turbidity and phytoplankton biomass. The density dependent effects of curimatã on aquatic communities and water quality are analyzed in the third chapter. The results suggest that, through different mechanisms, the two species contribute to phytoplankton increase and water turbidity and that theres no synergistic interaction between the effects of the two species. It is possible to conclude, based on the results, that the removal of tilapia and curimatã can be a viable alternative of biomanipulation in tropical environments.

MEMBROS DA BANCA:
Externo à Instituição - GUSTAVO HENRIQUE GONZAGA DA SILVA - UFERSA
Presidente - 1362202 - JOSE LUIZ DE ATTAYDE
Interno - 2412921 - JULIANA DEO DIAS
Externo à Instituição - RODRIGO FERNANDES - UFERSA
Interno - 1764855 - VANESSA BECKER