Banca de DEFESA: AMANA SILVA CORDEIRO DE ALMEIDA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : AMANA SILVA CORDEIRO DE ALMEIDA
DATA : 18/12/2020
HORA: 08:30
LOCAL: Instituto de Biologia (virtual)
TÍTULO:

Phytoplankton Metacommunity In Camamu Bay, Bahia, Brazil

PALAVRAS-CHAVES:

Phytoplankton, Elements of Metacommunity Structure, Variation partitioning, Estuary

PÁGINAS: 44
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
RESUMO:

The metacommunity theory arose with an interest in investigating how local and regional processes interact in the structure of the community and the importance of environmental and spatial factors in determining this structure. However, this focus has not been addressed in tropical estuarine regions for phytoplankton communities, formed by the main group of primary producers of aquatic ecosystems. Thus, the present study aimed to investigate how environmental filters and spatial predictors influence the structure of the phytoplankton metacommunity of lotic systems that flow into Camamu Bay. For this, we use two complementary approaches, one based on the mechanisms through Redundancy Analysis (pRDA) and the other based on the standards with the application of a hierarchical test called Elements of Metacommunity Structure (EMS). Sampling was carried out in April and October 2013, thus contemplating a dry and a rainy period. The distribution of the ten collection points in the Maraú, Orojó and Serinhaém rivers occurred along the salinity gradient, where qualitative and quantitative samples of phytoplankton were collected; water samples for nutrient analysis: silicate, phosphate, nitrate, ammonia and total nitrogen; and physical-chemical parameters were measured: pH, dissolved oxygen, salinity, temperature and total dissolved solids. The analyzes indicated three patterns of metacommunity: Gleasonian, Clementsian and Quasi-nested, with a change in the pattern between the dry and rainy periods. Only the Maraú River exhibited the Gleasonian pattern in both periods. As for the mechanisms, there was a predominance of total variation explained by the shared influence of environmental and spatial predictors. Thus, we can conclude that changes in rain patterns can interfere in the structures of phytoplankton communities in tropical estuarine environments, however both spatial and environmental variables will be important in structuring these communities.

MEMBROS DA BANCA:
Presidente - 1475171 - DORIEDSON FERREIRA GOMES
Externo à Instituição - JEFERSON GABRIEL DA ENCARNAÇÃO COUTINHO
Interno - 3054284 - PAVEL DODONOV