Banca de QUALIFICAÇÃO: GIOVANI SPINOLA DE CARVALHO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : GIOVANI SPINOLA DE CARVALHO
DATA : 06/08/2024
HORA: 14:00
LOCAL: Celbe - PPGCA e de forma remota
TÍTULO:

IMPACT OF TOTAL MERCURY ON ENERGY FLOW AND BIODIVERSITY LOSS IN THE UPPER COURSE OF THE PARAGUAY RIVER, MATO GROSSO, BRAZIL

PALAVRAS-CHAVES:

total organic carbon, total organic nitrogen, tegus, Oecomys spp.

PÁGINAS: 80
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

The state of Mato Grosso hosts the Amazon, Cerrado, and Pantanal biomes, presenting a vast diversity of fish, reptile, and mammal species. However, in recent decades, this biological diversity has been eroded by environmental anthropization intensified by agribusiness. From the 1980s onward, the expansion of agricultural frontiers, spurred by the introduction of settlers and cattle ranching, promoted deforestation, particularly in the upper course of the Paraguay River. Land Use and Land Cover (LULC) changes are a significant force transforming ecosystems and causing biodiversity loss due to habitat fragmentation and reduction, which impairs ecological connectivity and the availability of food resources for lizards and mammals. This fragmentation affects species displacement, ecological dynamics, trophic relationships, and energy flows in ecosystems, while also directly influencing diet and mercury bioaccumulation. To understand long-term dietary patterns, we use isotopic analyses that reveal trophic positions, habitat preferences, and feeding patterns over time. It is crucial to understand how habitat modification and fragmentation influence mercury flux in ecosystems since changes in landscapes and diets can affect the availability and detoxification of mercury. THg bioaccumulation can impact wildlife diversity, which faces a continuous erosion process amid LULC changes and climate change, affecting the distribution and accumulation of mercury in ecosystems. To investigate these changes and their impacts, we utilize satellite image analyses (LULC) and measurements of total mercury content and isotopic ratios of carbon (δ13C) and nitrogen (δ15N). These isotopic ratios, including δ13C and δ15N, are fundamental for understanding ecological dynamics, trophic relationships, and variations in feeding patterns, offering valuable insights into the ecological niches of organisms. Understanding how mercury is absorbed and distributed through food chains is essential for interpreting the impacts of anthropization and the mobilization of THg, which shows greater accumulation downstream of the Paraguay River, particularly in the Taiamã Ecological Station. These markers provide an integrated view of habitat LULC, foraging patterns, and bioaccumulation, enabling the tracking of mercury sources in the environment.

MEMBROS DA BANCA:
Presidente - 83200001 - AUREA REGINA ALVES IGNACIO
Interno - 71440008 - MANOEL DOS SANTOS FILHO
Interna - 110049004 - MARIA APARECIDA PEREIRA PIERANGELI
Externa à Instituição - 398.302.058-51 - SOFIA ELLEN CAUMO MIRANDA - Fiocruz - RJ
Externo à Instituição - VLADIMIR ELIODORO COSTA - UNESP