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- Ecological tools for the management of cyanobacteria blooms in the Guadiana River watershed, Southwest IberiaPublication . Galvão, Helena M.; Reis, Margarida P.; Domingues, Rita B.; Caetano, Sandra; Mesquita, Sandra; Barbosa, Ana B.; Costa, Cristina; Vilchez, Carlos; Ribau Teixeira, MargaridaStrong water demand for irrigation, energy and drinking water production is responsible for an increasingly regulation of freshwater flow patterns and watersheds. In this context, the construction of dams allows water storage but seriously restricts freshwater flow downstream. Due to scarcity of freshwater resources, reservoir water management often promotes high hydraulic residence. This may cause strong impacts on biological components of aquatic ecosystems, influencing the development of cyanobacteria blooms and aggravating their harmful impacts.