Banca de DEFESA: GIOVANI SPINOLA DE CARVALHO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : GIOVANI SPINOLA DE CARVALHO
DATA : 31/10/2024
HORA: 14:00
LOCAL: Celbe - PPGCA e de forma remota
TÍTULO:

RELATIONS BETWEEN STABLE ISOTOPES OF δ¹³C AND δ¹⁵N AND TOTAL MERCURY CONCENTRATION IN NICHE CHANGES IN THE UPPER COURSE OF THE PARAGUAY RIVER, MATO GROSSO, BRAZIL.

PALAVRAS-CHAVES:

 Didelphimorphia, Rodentia, Biomagnification, Tegus

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

The state of Mato Grosso encompasses the Amazon, Cerrado, and Pantanal biomes, presenting a vast diversity of fish, reptile, and mammal species. However, in recent decades, biological diversity has been eroded by the intensification of anthropogenic activities that have increased since the 1980s with the expansion of agricultural frontiers promoting deforestation, especially in the upper course of the Paraguay River. Changes in land use and cover are among the forces driving habitat transformation, reduction, and loss. Ecological connectivity and environmental changes affect the quality of food resources and habitats for fish, lizards, and mammals. The anthropized environment causes species displacement, altering ecological dynamics, trophic relationships, and energy flows in ecosystems, besides directly influencing diet and mercury bioaccumulation. To understand long-term diets, we used isotopic analyses that reveal trophic position, habitat preferences, and mercury bioaccumulation patterns. It is crucial to comprehend how habitat modification and fragmentation influence mercury flow in ecosystems because landscape alterations lead to changes in diets, bioaccumulation, and mercury detoxification. The distribution and accumulation of mercury impact wildlife diversity, which faces an environment of climate change and new land uses and cover. To investigate these changes and their impacts, we utilized satellite image analyses and measurements of total mercury content and stable isotopes of carbon (δ13C) and nitrogen (δ15N). Stable isotopes, 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 to interpret the impacts of anthropization and the mobilization of total mercury (THg), which presents an accumulation pattern from upstream to downstream in the upper course of the Paraguay River, with greater bioaccumulation at the Taiamã Ecological Station. These markers offer an integrated view of land use and cover, habitat foraging patterns, and bioaccumulation, enabling the tracking of mercury sources in the environment.

MEMBROS DA BANCA:
Presidente - 83200001 - AUREA REGINA ALVES IGNACIO
Interno - 704.948.001-00 - GUSTAVO RODRIGUES CANALE - UFMT
Interno - 52857001 - JULIANO ANDRE BOGONI
Externo à Instituição - JOAO HENRUQUE FERNANDES AMARAL - UR
Externo à Instituição - MARCOS JOSÉ SALGADO VITAL - UFRR