Effects of Increasing Nitrogen and Phosphorus Concentrations on Phytoplankton Community Growth and Toxicity During Planktothrix Blooms in Sandusky Bay, Lake Erie
作者： Timothy W. Davis , George S. Bullerjahn , Taylor Tuttle , Robert Michael McKay , Susan B. Watson
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摘要: Sandusky Bay experiences annual toxic cyanobacterial blooms dominated by Planktothrix agardhii/suspensa. To further understand the environmental drivers of these events, we evaluated changes in growth response and toxicity Planktothrix-dominated to nutrient amendments with orthophosphate (PO4) inorganic organic forms dissolved nitrogen (N; ammonium (NH4), nitrate (NO3) urea) over bloom season (June – October). We complemented a metagenomic analysis planktonic microbial community. Our results showed that microcystin (MC) concentrations responded more frequently additions N than PO4, dual addition NH4 + PO4 Urea yielded highest MC 54% experiments. Metagenomic confirmed P. agardhii/suspensa was primary producer. The phylogenetic distribution nifH revealed both heterocystous cyanobacteria heterotrophic proteobacteria had genetic potenti...
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