We manipulated pH levels (7, 7.5, 8.5)
of in situ experimental enclosures during 21 d pre-bloom and bloom development experiments in Lake
Granbury, TX, USA, an impoundment consistently impacted by P. parvum blooms. Neutral pH levels
preempted P. parvum bloom development. Population densities never reached bloom proportions and no
ambient toxicity to fish or cladocerans resulted. However, higher pH (8.5) allowed bloom formation to
occur and resulted in ambient toxicity. During both experiments, reducing pH to 7 and 7.5 did not
adversely affect phytoplankton or zooplankton biomass.
We manipulated pH levels (7, 7.5, 8.5)of in situ experimental enclosures during 21 d pre-bloom and bloom development experiments in LakeGranbury, TX, USA, an impoundment consistently impacted by P. parvum blooms. Neutral pH levelspreempted P. parvum bloom development. Population densities never reached bloom proportions and noambient toxicity to fish or cladocerans resulted. However, higher pH (8.5) allowed bloom formation tooccur and resulted in ambient toxicity. During both experiments, reducing pH to 7 and 7.5 did notadversely affect phytoplankton or zooplankton biomass.
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