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DrCayelanCarey Experimentalcyanobacterialbloomscanincreasethebiomass,richness,diversity,andstabilityoftheeukaryoticphytoplanktoncommunityCyanobacterialbloomsareincreasinggloballyinmanyfreshwaterlakes,botheutrophicandoligotrophic.Freshwatercyanobacteriagenerallyhavenegativeeffectsoneukaryoticphytoplanktonineutrophiclakesbecauseoftheirabilitytoformdensesurfacescumsthatreducelightavailability.However,lessisknownabouttheeffectsofcyanobacteriaonotherphytoplanktoninoligotrophiclakes.WeconductedseveralexperimentsmanipulatingthedensityofGloeotrichiaechinulata,alargecolonialcyanobacteriumthatisincreasinglyobservedinlow-nutrientlakesinthenortheasternUnitedStatesandCanada.Inlow-nutrientmesocosms,Gloeotrichiaincreasedthebiomass,richness,anddiversityofotherphytoplankton,likelybecauseitincreasednitrogenandphosphorusconcentrationsinthemesocosms.Interestingly,wealsoobservedthatGloeotrichiastabilizedthecompositionoftheeukaryoticphytoplanktoncommunity:theno-Gloeotrichiacontroltreatmentexhibitedgreatermultivariatedispe
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