Comunidade fitoplanctônica do Açude Santo Anastácio, Campus do Pici, Fortaleza (Ceará, Brasil)

Abstract

Reservoirs located in urban areas usually receive wastewater and materials discarded by the population in their surroundings, consequently this load will contribute to the process of degradation of the water quality of the ecosystem. The present study aimed to analyze the phytoplankton community in the Santo Anastácio reservoir, Pici Campus, in Fortaleza/CE. Monthly collections were carried out from March to October 2024. In situ, 100 liters of water were filtered in a plankton net, concentrated to 10 mL and preserved in 4% formaldehyde; as well as records of transparency, temperature, pH, dissolved oxygen, ammonia and phosphate levels in the reservoir water. The analyses were carried out at the Bioecology Laboratory/UFC and the identification based on references pertinent to the subject. The trophic state index (TSI) of the reservoir was also calculated. The results showed that the variation of physical and chemical parameters revealed eutrophic water, corroborating the IET, whose phytoplankton community was composed of seven species, with emphasis on Oscillatoria sp., Planktothrix sp., Triceratium sp., Euglena oxyuris and Phacus ssp., as bioindicators of eutrophic and/or polluted water.