Banca de DEFESA: FACUNDO ALVAREZ
Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.DISCENTE : FACUNDO ALVAREZ
DATA : 21/12/2022
HORA: 09:00
LOCAL: Online transmitido via Google Meet - Nova Xavantina - MT
TÍTULO:
Spatiotemporal hyperdominance of Cerrado trees
PALAVRAS-CHAVES:
Cerrado biome, savannah, abundance, dominance, hyperdominance, conservation, local regression models, species distribution models.
PÁGINAS: 105
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
SUBÁREA: Ecologia de Ecossistemas
RESUMO:
The Cerrado: a global biodiversity hotspot, the second largest biome in South America, the largest neotropical savannah ecosystem, it is also the biome with the lowest conservation indices and the greatest anthropic degradative effects of soil use and conversion. Different investigations have contributed to the knowledge of this megadiverse biome, however, it still faces knowledge gaps: How many species does the Cerrado have? What is the most common species and family? What are the environmental limits of the Cerrado and savannah ecosystems in South America? What is the current conservation status of these species? and, will environmental niches be contemplated in the face of future climate changes?. Based on local regression models and species distribution models, we were able to contribute and reduce these knowledge gaps. In this sense, our research allows us to identify the following points: 1) the Cerrado shows dominance in tree species: 30 species of tree biodiversity represent more than 50% of all individuals (585 species and 219850 individuals); 2) The most common species in the Cerrado is Qualea parviflora (7.2% of all species and 15752 ind.) and the dominant family is Vochysiaceae (21 species and 37261 ind.); 3) We know 36% of all tree biodiversity in the Cerrado, our estimates point to the existence of 1605 species of trees, of which 1020 species are still waiting to be discovered and identified; 4) The records of the presence of the hyperdominant species of the Cerrado make it possible to calculate the environmental adequacy of the savannah ecosystems of South America; 5) Only 37% of the 585 hyperdominant species recorded for the Cerrado are within Protected Areas and 1% in Indigenous Lands; 6) Due to anthropic actions, the Cerrado lost 2.40x107 km2 from 1985 (1.11x108 km2) to 2020 (8.73x107 km2); 7) The predictions of environmental adequacy of the hyperdominant Cerrado species overlap 8.9% with Protected Areas and 8% with Indigenous Lands; 8) The distribution patterns of the 30 hyperdominant species, for the present and future scenarios, showed spatial stability of ~771675 km2, gain of new environmental niches of ~68106 km2 and loss of environmental suitability of ~52240 km2. The Cerrado has one tenth of the species diversity estimated for the Amazon. However, the accumulated rates of deforestation and degradation are higher for the Cerrado, triggering negative synergistic mechanisms of an anthropic-environmental type with irreversible effects on biodiversity and derived ecosystem services. The environmental complexity inherent to the Cerrado is difficult to understand and dismember, which makes conservation very difficult, even so, there are countless investigations that point out the ways to be followed to conserve it and to conserve the culture of its original peoples.
MEMBROS DA BANCA:
Presidente - V3000654-H - TED RONALD FELDPAUSCH - NENHUMA
Interno - 888.812.616-34 - FREDERICO AUGUSTO GUIMARÃES GUILHERME - UFJ
Interno - 253812001 - PEDRO VASCONCELLOS EISENLOHR
Externo à Instituição - ERALDO APARECIDO TRONDOLI MATRICARDI - UnB
Externo à Instituição - RENATA DIAS FRANÇOSO BRANDÃO - UFLA