Growth of Microcystis strains isolated from environments with the presence and absence of submerged macrophytes in coexistence with Ceratophyllum demersum

Cyanobacterial blooms can cause severe ecological and health problems in drinking water reservoirs. To alleviate this problem, allelopathically active submerged macrophytes be used to reduce cyanobacterial growth. Accordingly, study aimed evaluate the sensitivity of strains Microcystis aeruginosa complex isolated from reservoirs with presence absence allelochemicals Ceratophyllum demersum. A coexistence experiment was carried out between macrophyte C. demersum four strains, two treatments for each strain, one (7 g L-1) control (in macrophyte). Two M. (BMIUFRPE-06 BMIUFRPE-07) panniformis (BMIUFRPE-08 BMIUFRPE-09) were used, which Cajueiro (with macrophytes) Tapacurá (without reservoirs, respectively. The biomass reservoir without significantly inhibited 96% (T-test: p < 0.01) 74% p< 0.05), when compared control, respectively, lower values growth rates (ANOVA: 0.05). showed a delay (biomass reductions 44 58%, respectively) treatment but significant difference on sixth day - T-test: > 0.05; rate ANOVA: These results suggest that environments are less sensitive these plants, as may adapted macrophytes.