The A Baxe reservoirs is a fundamental source of drinking water supply to surrounding dwellings. This study seeks to obtain a holistic vision over the various threats that affect the Cyano-HABs of Umia basin and especially of A Baxe reservoir (Galicia, NW Spain), through the method of Partial least squares path modeling (PLS-PM). In addition, this study highlighted that artificial dams could alter water current, en-hance the accumulation of pollutants and increase the water residence time, resulting in watereutrophication and cyanobacteria blooms in Tri An reservoir.Ĭyano-HABs are proliferating around the world due to anthropogenic nutrient enrichment of freshwater bodies. Excessive of using fertilizers and pesticides, increased aquacultural,agricultural and industrial activities, and changed in land surface were commonly considered asmain causes. During the last several years, cyanobacteria, mainlyMicrocystisspp., was dominant andformed blooms in the reservoir. In contrast, the trophic status calculated basing on total nitrogen (TN) and total phospho-rus (TP) concentrations indicated that the water condition was light-eutrophic to hyper-eutrophic.This indicated that the WQI was not appropriate to classify the water quality, particularly in Tri Anreservoir. Results showed that the wa-ter quality index (WQI) ranked from moderate to good status with a gradual deterioration in thequality. Based on that, the impacts ofartificial dam on water quality and trophic status were accessed. This study aimed to investigate the long-term variations of water quality, trophic status andcyanobacteria community in Tri An reservoir from 2008 to 2019.
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