Banca de DEFESA: IASMIM DE DEUS GARGUR LEAL

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : IASMIM DE DEUS GARGUR LEAL
DATA : 13/11/2020
HORA: 09:00
LOCAL: Defesa virtual devido medidas de isolamento socials
TÍTULO:

TEMPORAL DISTRIBUTION OF THE DEPOSITED ORGANIC MATTER DISTRIBUIÇÃO IN THE REGION OF MANGROVE LIMIT OCCURENCE IN THE WEST COAST OF SOUTH ATLANTIC OCEAN

PALAVRAS-CHAVES:

Mangrove, n-alkanes, GC-FID, TOC, TN, sedimentary core, Santo Antônio lagoon.

PÁGINAS: 78
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Oceanografia
SUBÁREA: Oceanografia Química
RESUMO:

Mangroves are ecosystems located in the transitional region between the continent and the oceans of tropical and subtropical environments. They are subject to the action of the tide, and its occurrence and development are controlled by regional and global factors, such as oceanographic/climatic characteristics and the presence of human activities. Considering that mangrove ecosystems have important ecological, social, and economic functions, it is essential to have a greater understanding of their responses to natural and anthropogenic pressures. This assessment can be done by analyzing the behavior of organic matter deposited in mangroves through the determination of organic molecular markers, as n-alkanes. These are saturated aliphatic hydrocarbons produced mainly by primary producers, such as higher plant and phytoplankton. As they have specific sources and chemical stability, n-alkanes can be used to identify the main sources of organic matter in aquatic systems. The objective of this thesis is to evaluate, through the analysis of n-alkanes in sedimentary cores, the temporal changes in the deposition of organic matter in the southern limit of occurrence of mangroves on the west coast of the South Atlantic. Two sedimentary cores were collected in the Santo Antônio lagoon (LSA, Santa Catarina - Brazil), were sliced into 1 cm sections. Based on stratigraphic discontinuities, two bulk samples (10 g each) from both sediment cores were selected for ¹⁴C analysis. The granulometric, total organic carbon (TOC), and total nitrogen (TN) analyzes were performed every 5 cm. The first analysis was performed using a particle analyzer by laser diffraction, and the last two were performed using an Elementary Analyzer. The analysis of n-alkanes occurred every 5 cm from collected cores, using a Gas Chromatography coupled with a Flame Ionization Detector (GC-FID). This thesis is in scientific article format, the specific abstract of which will be presented in its corresponding chapter.

MEMBROS DA BANCA:
Presidente - 2134515 - ANA CECILIA RIZZATTI DE ALBERGARIA BARBOSA
Interno - 3055474 - TATIANE COMBI
Externo à Instituição - César de Castro Martins - UFPR
Externo à Instituição - MARLON CARLOS FRANÇA - IFES