Objective: The objective of this study was to evaluate the physical-chemical and microbiological parameters of the water from Lago das Rosas, as well as to qualitatively evaluate the phytoplankton community during periods of drought and rain, with the aim of determining the water quality of the ecosystem.
Theoretical Framework: The association of physical-chemical and microbiological analyzes with bioindicators contributes to an holistic view regarding the understanding of the environmental quality of the ecosystem. And among the main bioindicator organisms are phytoplankton, microscopic, photosynthetic organisms that respond quickly to environmental changes.
Method: The methodology adopted for this research comprises the analysis of physical-chemical and microbiological variables, as well as the qualitative assessment of the phytoplankton community, carried out through microscopic analyzes and assistance from the literature.
Results and Discussion: The results obtained revealed that in the dry and rainy periods, the Lake did not present eutrophication conditions, however, an increase in organic load was detected in the rainy period. Variation that directly influences the composition of the phytoplankton community existing in the ecosystem. The dominance of the Chlorophyceae class and the existence of cyanobacteria that produce toxins that are harmful to health were identified, such as Lyngbya, Planktothrix and Aphanocapsa.
Research Implications: The results presented are an important tool for control and monitoring and can assist bodies responsible for managing urban lakes.
Originality/Value: This study contributes to the literature, given the need for more up-to-date data and research regarding water quality and monitoring of the phytoplankton community in urban lakes in Goiânia.
