Controlling Harmful Cyanobacteria: Taxa-Specific Responses of Cyanobacteria to Grazing by Large-Bodied Daphnia in a Biomanipulation Scenario.

Although some cyanobacterial species ( Aphanizomenon gracile and Microcystis botrys ) showed a negative response to grazing in July ( Table 2 ), these results coincided with a positive effect of grazer abundance on the net growth rate of the most abundant species Dolichospermum crassum (marginally significant, p = 0.059, Table 2 , Fig 2 ).

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Chlorophyll-a levels and total cyanobacterial biomass showed a decreasing trend since the start of the biomanipulation ( Fig 3 ), as did the two most dominant cyanobacterial taxa, Microcystis and Planktothrix ( Fig 3 ).

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Similar to the total phosphorous and chlorophyll-a concentrations, the total cyanobacterial biomass significantly increased from 1996–2005, but a negative trend was observed after the start of the biomanipulation ( Fig 3 ).

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While the filamentous cyanobacterial taxa Aphanizomenon and Dolichospermum did not show any apparent changes during the whole study period ( Fig 3 ), the colony-forming Microcystis and filamentous Planktothrix showed an increasing trend in biomass until the start of the biomanipulation, after which the increasing trend shifted and they started to decline gradually ( Fig 3 ).

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