Banca de DEFESA: GERLANE DE MEDEIROS COSTA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : GERLANE DE MEDEIROS COSTA
DATA : 05/05/2022
HORA: 13:00
LOCAL: ENSINO REMOTO EMERGENCIAL
TÍTULO:

THg CONCENTRATION IN ORGANS OF Megaceryle torquata AND Chloroceryleamazona ON THE JURUENA, TELES PIRES AND PARAGUAY RIVERS IN THE STATE OFMATO GROSSO

PALAVRAS-CHAVES:

water birds; Heavy metals; Contamination; feathers; ramfoteca

PÁGINAS: 101
GRANDE ÁREA: Ciências Biológicas
ÁREA: Bioquímica
RESUMO:

The indiscriminate use and the increase in the release of mercury (Hg) to the environment has made this metal a global problem, being among the top three substances that pose a danger for the health of the environment. Of natural and anthropogenic origin, Hg has several physical forms. and chemicals that facilitate their distribution, biological enrichment and toxicity. the growing agricultural expansion, with deforestation and fires, endangers the integrity of the soil and promotes the release and re-emission of Hg to the atmosphere with subsequent deposition in soils and bodies of water, where it can undergo methylation and acquire its organic form, methylmercury (MeHg). With the potential to bioaccumulate and biomagnify in the trophic chain, MeHg reaches the waterfowl, top predators of the aquatic food chain. Searches around the world have been using this bird guild to study the dynamics and effects of this metal on health environmental. With the hypothesis that rmphotheca may demonstrate THg concentration levels (Total Mercury) accumulated over longer periods of time than organs usually used, we compared their concentrations with the concentrations of Hg in feathers from a species of European gull (Larus michahellis) and with two feathers, claws, muscle and liver Neotropical bird species (Megaceryle torquata and Chloroceryle amazon). With the objective to understand the dynamics of THg in the face of changes in land use and occupation, we analyzed THg concentrations in the organs of two species of kingfisher, Megaceryle torquata and Chloroceryle amazona, in the Juruena, Teles Pires and Paraguai rivers, with reading in the changes that have occurred in the landscape of the last 20 years. The results obtained showed that the rmphotheca is an efficient tool for the analysis of environmental contamination by Hg in water birds. The concentrations of THg in the organs of M. torquata, in descending order, were, rhamphotheca (3.00 µg/g) > feathers (2.95 µg/g) > claws (2.22 µg/g) > liver (1.21 µg/g) > muscle (0.70 µg/g) and for C. amazon, feathers (2.27 µg/g) > rmphotheca (1.92 µg/g) > claws (1.42 µg/g) > liver (0.47 µg/g) > muscle (0.46 µg/g). The species that best expressed the metal concentrations was C. amazon. The Pantanal area showed the lowest levels of THg in soil and inverse distribution behavior to soils in Amazonian areas, where, the Teles Pires river with the highest deforestation rate expressed the highest levels of THg in the soil and in the water and the smallest in the sediment. There was no strong correlation between the THg levels of the bird organs and abiotic variables (soil, sediment and water), which suggests that levels of Hg that will be bioavailable for the trophic chain are related to physical-chemical factors of the environment.

MEMBROS DA BANCA:
Interno - 65536013 - CLAUMIR CESAR MUNIZ
Interno - 80970002 - DIONEI JOSE DA SILVA
Externo à Instituição - JEAN REMY DAVEE GUIMARÃES - UFRJ
Presidente - 71440008 - MANOEL DOS SANTOS FILHO
Interno - 110049004 - MARIA APARECIDA PEREIRA PIERANGELI
Externo à Instituição - WANDERLEY RODRIGUES BASTOS -
Interno - 001.165.931-99 - WILKINSON LOPES LAZARO - UFRJ