Banca de DEFESA: MAELLY DALLET ALVES GONÇALVES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : MAELLY DALLET ALVES GONÇALVES
DATA : 20/08/2023
HORA: 10:00
LOCAL: Online transmitido via Google Meet
TÍTULO:

Important and so forgotten: diversity and productivity of herbs in phytophysiognomies of the Amazon-Cerrado transition

PALAVRAS-CHAVES:

Floristic composition; Canopy coverage; Biomass; Savanna.

PÁGINAS: 60
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
SUBÁREA: Ecologia de Ecossistemas
RESUMO:

Herbaceous plants are usually neglected in ecological studies. They are essential during the process of ecological succession, as they are important to facilitate the entry of other species and other strata such as arboreal. Understanding the ecological characteristics of herbaceous plants is extremely necessary to contribute to the conservation of biodiversity. In this context, we evaluated the richness, diversity, abundance and biomass of herbaceous species in a vegetation and light gradient from savannah to forest in the Amazon-Cerrado transition. We used 1m diameter circles, established in the four cardinal directions at 5m intervals along four transects in the phytophysiognomies of rocky cerrado, typical cerrado, dense cerrado, regenerating cerrado and preserved cerrado, in a Conservation Unit in Nova Xavantina, Mato Grosso, Brazil. We measured species richness, abundance of individuals and aerial biomass of herbaceous plants. We also measured the leaf area index (LAI) using hemispherical photographs. In total, we sampled 2,334 individuals, 132 species/morphospecies and 26 botanical families, with only four taxa shared between phytophysiognomies. The luminosity exerted influence on the savanna phytophysiognomies, resulting in a greater richness and abundance of herbaceous species in comparison to the forest phytophysiognomies. In addition, we observed a biomass gradient in the herbaceous stratum, with lower values (preserved savannah = 0.168 ± 0.32) and higher values of Leaf Area Index (preserved savannah = 3.46 ± 0.10 m²/m²) in forest phytophysiognomies, and, on the other hand, higher values (cerrado rupestre = 19.6 ± 21.8) and lower values of LAI in the savannah formations (cerrado rupestre = 0.90 ± 0.10 m²/m²). The reduction of light intensity affects the structure of the herbaceous plant community, establishing a more accentuated biomass gradient in the savannah formations, which makes these environments richer and more diversified. Our resarch is relevant to the ecological understanding of these ecosystems and can support management and conservation strategies for this often neglected, but important and essential, stratum in the plant communities of the transition region between the Amazon and the Cerrado.

MEMBROS DA BANCA:
Externo à Instituição - HALINA SOARES JANCOSKI - UNEMAT
Presidente - PAJ042729 - IMMACULADA OLIVERAS MENOR - York
Interno - 986.188.651-68 - SIMONE MATIAS DE ALMEIDA REIS - UNEMAT