Banca de DEFESA: SÂMEA CIBELE FREITAS DA SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : SÂMEA CIBELE FREITAS DA SILVA
DATA : 25/03/2020
HORA: 08:30
LOCAL: Sala 107, unidade Amazônia
TÍTULO:

Cianobactérias no Baixo Rio Tapajós, Amazônia, Brasil

PALAVRAS-CHAVES:

Cyanobacteria. Amazon. Lotic environment. Clear water. Water quality.

PÁGINAS: 93
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

Cyanobacterial blooms occurred in the Tapajós River, Western Pará, Brazil. This overgrowth of potentially toxic cyanobacteria has been recorded worldwide, often associated with anthropogenic environments. The phenomenon is less frequent in lotic environments, and there is a shortage of investigations related to the topic in the Amazon. The present study aimed to analyze the space and seasonality of cyanobacteria in water bottles, collected on a monthly scale for 10 months in the Tapajós River on five beaches for recreational use and to verify the condition of bathing and the potential of cyanobacteria. A richness in species of cyanobacteria was estimated by the number of taxa per sample and a quantitative analysis of cyanobacteria was performed by the method of Utermöhl (1958). There are 22 taxa of cyanobacteria distributed in 11 genera, including Microcystis, Dolichospermum, Aphanocapsa, Lyngbya and Planktothrix, species potentially producing cyanotoxins. Throughout the sampled period, cyanobacteria were found in the water and no spatial variations in the richness and population density of cyanobacteria were found. On the other hand, there was a time difference in the amount of cyanobacteria in which the highest values of richness and densities were recorded during the period of lowest glove supply and during the phases of leakage and low waters of the river. It has been suggested that, during a period and period of leakage and low water, the effect of revolving and resuspension of nutrients, combined with hydrodynamic conditions of the Tapajós River, provide limnological conditions favorable to the growth of cyanobacteria, such as those that can be intensified by use disorderly land use and occupation. The period of high tourist season coincided with the moment when there are more blooms of cyanobacteria. In addition, the tapajós river water was inappropriate for recreational contact in 12% of the clothes analyzed, and in 34% of the clothes investigated, they had the possibility of human contamination through the consumption of water during flowering moments, as they were at odds with a standard. Despite the amount of cyanobacteria measured in the longest study period in accordance with the values stipulated by the legislation, the presence of potentially toxic genera represents a silent threat in this environment, therefore, it must be monitored.

MEMBROS DA BANCA:
Externa ao Programa - 2391001 - DAVIA MARCIANA TALGATTI
Interno - 1520271 - JOAO RICARDO VASCONCELLOS GAMA
Interno - 2143267 - JOSE MAX BARBOSA DE OLIVEIRA JUNIOR
Externo ao Programa - 1549200 - LUCINEWTON SILVA DE MOURA
Externo ao Programa - 1562643 - MAXWELL BARBOSA DE SANTANA
Presidente - 1693122 - SERGIO DE MELO