Banca de QUALIFICAÇÃO: FELIPE PEREIRA MARINHO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : FELIPE PEREIRA MARINHO
DATA : 09/11/2018
HORA: 08:00
LOCAL: Laboratório Didático 1, Departamento de Ecologia da UFRN
TÍTULO:

Influence of functional traits on plant fitness in response to drought and aboveground biomass removal

PALAVRAS-CHAVES:

Functional traits; goats; grazing; plant susceptibility; abiotic stress; non-structural carbohydrates; resprouting

PÁGINAS: 50
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
RESUMO:

Biotic and abiotic stressors reduce plant productivity through of changes in levels of limiting conditions affecting important functions such as photosynthesis. Drought and aboveground biomass (AGB) removal by land use activities are two recurrent stresses in semiarid environments. However, effects of these stresses applied simultaneously on plant growth is still poorly understood. The purpose of this thesis is to understand the response of plants to water stress and aboveground biomass (AGB) removal, besides to identifying functional traits that promote resistance to these stresses. The thesis is structured in four chapters: 1) which leaf traits are related to the plant susceptibility to grazing by goats, 2) How the combination between AGB removal and water stress affect the biomass growth and non-structural carbohydrates contents (starch and non-reducing sugars) in plants, 3) As functional traits are related with resprouting vigor in different Caatinga plant species, and 4) How non-structural carbohydrate content in leaves and roots affect the survival and biomass recovery of plants in a restored system. In the first chapter it was verified that although the domestic goat be a generalist herbivore, juvenile plants of the Caatinga presented foliar traits that promote resistance to grazing or minimize the chances of being grazed. In the second chapter we verified that water stress and AGB removal reduced the growth rates in Mimosa tenuiflora saplings and that the magnitude of the effects were similar between the two applied stresses. When applied simultaneously the stresses showed a strong reduction in the growth rates and the root starch content. These results demonstrate that herbivory pressures by exotic animals when practiced in low rainfall years may prevent the regrowth and recovery of important root reserves for survival during the dry season.  

MEMBROS DA BANCA:
Interno - 1678202 - CARLOS ROBERTO SORENSEN DUTRA DA FONSECA
Presidente - 1677189 - GISLENE MARIA DA SILVA GANADE
Interno - 3058386 - VANESSA GRAZIELE STAGGEMEIER