Banca de QUALIFICAÇÃO: AUGUSTO CÉSAR DA SILVA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : AUGUSTO CÉSAR DA SILVA
DATE: 18/11/2021
TIME: 14:00
LOCAL: via Google Meet (meet.google.com/csw-dtvj-sqn)
TITLE:

Macroecological patterns and ecological strategies of Caatinga vegetation



KEY WORDS:

Bioregionalization; Human effects; Traits; CSR; Abundance; Drylands


PAGES: 160
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

Despite the growing knowledge about the distribution and functioning of vegetation in dry environments, its internal structure and functional attributes are important factors for understanding the organization of these plant communities. The objectives of the work were 1) to carry out the delineation of sub-regions, evaluating the determinants of their spatial distribution, 2) to identify the functional strategies of species in the Caatinga within the scope of CSR theory and global functional spectrum, and 3) to identify the patterns of hyperdomains and their determinants. Subregions were identified and mapped, partitioning interpolated NMDS axes using K-means. We use a selection of GLM models to identify the set of variables that explain the deviation across subregions. The classification of strategies used data on occurrences of tree species, obtained from literature and databases (TRY, BIEN, KEW). Functional data (LA, LDMC, Nmass, LMA, SSD, H) were used to calculate the CSR and functional space strategies for Caatinga. We used the StratFY matrix and a phylogenetic PCA to generate the CSR strategies and functional correlations. The CSR and pPCA axes were related to complementary variables through ANOVAs and regressions. K-means analysis identified 10 subregions. The combined fractions of aridity, topography and soil, stability of the Pleistocene biome, and the historical effect of indigenous activities explain most of the variability across subregions. The strategies of the species in the caatinga are mostly concentrated in the competitor-stressor space of the CSR triangle. When comparing the CSR axes and complementary variables, all functional and vegetation classification variables showed differences in their categories with at least one ecological strategy. The correlation between functional attributes shows a phylogenetic sign, the first two axes of pPCA explain 76% of the variation of these attributes, reflecting in three main functional groups in the Caatinga. The existing subregions, functional strategies and hyperdominance patterns in the Caatinga can support important decisions in conservation and management..



BANKING MEMBERS:
Presidente - 1837921 - ALEXANDRE FADIGAS DE SOUZA
Externa ao Programa - 1813882 - ALICE DE MORAES CALVENTE VERSIEUX
Interna - 1677189 - GISLENE MARIA DA SILVA GANADE
Notícia cadastrada em: 28/10/2021 09:34
SIGAA | Superintendência de Tecnologia da Informação - (84) 3342 2210 | Copyright © 2006-2024 - UFRN - sigaa10-producao.info.ufrn.br.sigaa10-producao