Banca de DEFESA: WESLEY JONATAR ALVES DA CRUZ

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : WESLEY JONATAR ALVES DA CRUZ
DATA : 20/07/2020
HORA: 09:00
LOCAL: Campus de Nova Xavantina
TÍTULO:

Functional structure in communities and ecological strategies of trees in Amazonia-Cerrado transition

PALAVRAS-CHAVES:

Forests, savanna, functional traits, variability, functional biogeography, recovery.

PÁGINAS: 115
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
SUBÁREA: Ecologia de Ecossistemas
RESUMO:

The classification of plant species according to their function is an effective alternative to address ecological questions and responses of vegetation in relation to the physical environment. Understanding the importance of the variability of species strategies and functions requires the quantification of plant traits on a large scale. In this study we investigated the regenerative functional structure, trade-offs, ecological strategies and the intraspecific trait variability in a wide vegetation gradient between the Amazon and the Cerrado. We used a database composed of more than 80,000 records of functional attributes of almost 200 tree species in 39 permanent plots established in typical cerrado, cerradão, gallery forest, semideciduous seasonal forest, evergreen forest and open rain forest to answer the following questions: 1) What are the regenerative strategies and their influence on the structure of these different types of vegetation? 2) How does the functional structure change and what are the main trade-offs and strategies of the main tree species in the Amazon-Cerrado transition? 3) Is the intraspecific trait variability an indicator of better performance in forest and savanna species in multiscale? Our results showed that the species regenerative strategies are based on dry fruits dispersed by the wind or fleshy fruits dispersed by animals, being the most important zoocoria in all types of vegetation. We discovered the existence of remarkable strategies for resource use and survival in different types of vegetation. Strategies that change following the gradient from savanna and typical vegetation in the Cerrado to forest and typical in the Amazon. We record evidence that the intraspecific trait variability guarantees population growth and productivity on a regional scale. We conclude that the traits of fruits and seeds provide mechanisms for the tree species to reestablish themselves and the diversity of these characteristics can favor communities in each type of vegetation, which will allow them to withstand extreme environmental conditions. The morphological traits of leaves, bark and branches allowed us to identify ecological strategies and to classify the types of vegetation along the Amazon-Cerrado transition. We also found that not only the value of traits, but the magnitude of intraspecific variability influences the establishment and gain of aerial biomass, consequently causing an effect on local and regional demographic patterns. Our results provided indicators for predicting the response of the evaluated communities to possible environmental impacts, especially climate change, enabling better management and conservation of tree species.

MEMBROS DA BANCA:
Presidente - 82328001 - BEATRIZ SCHWANTES MARIMON
Interno - 000.000.000-00 - IMMACULADA OLIVERAS MENOR - York
Externo à Instituição - Adriane Esquivel Muelbert - UB
Externo à Instituição - DAVID ROBERTO GALBRAITH - LEEDS
Externo à Instituição - MARINA CORRÊA SCALON - UFPR