Banca de DEFESA: TAMIRES SANTANA SANTOS FREITAS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : TAMIRES SANTANA SANTOS FREITAS
DATA : 06/12/2019
HORA: 14:00
LOCAL: Instituto de Biologia
TÍTULO:

ALTERNATIVE STATE STATES IN A TROPICAL ESTUARY SYSTEM: BENTHIC FORAMINIFERS AS ENVIRONMENTAL PALEOINDICATORS.

PALAVRAS-CHAVES:

Critical transition, Ribeira Bay, Anthropic impact

PÁGINAS: 69
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
SUBÁREA: Ecologia de Ecossistemas
RESUMO:

In the face of the growing worry of the human way of life irreversibly changing ecological systems, there is an interest in using long-term paleoecological data to guide environmental management issues, addressing issues that include assessing the degree of historical change in specific ecosystems. One way to identify such changes is through early warning signs of changes. Recent studies show that systems, before approaching the critical transition, usually have similar characteristics and, therefore a series of generic properties can be used to describe similar characteristics considered as common early warning signs in different systems. Thus, this study aims to use a time series of diversity of preserved benthic foraminifera in the sediment of a tropical bay impacted by anthropic impacts to investigate the presence of alternative stable states and early warning signs of change between these states. We hypothesized that near the inflection points in the time series, the system will exhibit changes in the pattern of autocorrelation, skewness, and variance. For this, this work was divided into two chapters; The first chapter is an article to be submitted to the Marine Biology Research periodic and aims to describe the structure and composition of assemblies of fossil foraminifera in Bahia da Ribeira, dated in the last 30 years from the CI8 core; The second chapter is an article to be submitted to the periodic Ecological Indicators where a heuristic segmentation algorithm was applied to the paleoecological data of benthic foraminifera from core CI8 from Bay of Ribeira, aiming to identify the alternative stable states of the bay and, furthermore, an investigation about the existence of early warning signs of state change was realized.

MEMBROS DA BANCA:
Presidente - 1475171 - DORIEDSON FERREIRA GOMES
Interno - 1522396 - VANESSA HATJE
Externo ao Programa - 1613500 - MARIO ANDRE TRINDADE DANTAS