EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/26/2021 | 8:30 AM - 10:30 AM | Nitrogen form and concentrations effects on primary producer biomass, cyanotoxins, and microbiome structure in eutrophic and mesotrophic lake waters | Virtual Platform
Nitrogen form and concentrations effects on primary producer biomass, cyanotoxins, and microbiome structure in eutrophic and mesotrophic lake waters
Human activities have increased the frequency and intensity of cyanobacteria harmful algal blooms (cyanoHABs). Although phosphorus contributes to cyanoHABs, emerging work suggests nitrogen also influences cyanoHABs. Yet, the effects of nitrogen form and concentration on microbiomes and toxin production remain unclear. We manipulated nitrogen in 300 L aquatic mesocosms to address: (1) What form of nitrogen (nitrate vs. ammonium) fuels cyanoHAB development? (2) How does prior bloom history from a lake affect the propensity to stimulate new blooms with added nitrogen? Five nitrogen treatments, high/low nitrate, high/low ammonium, and a no added nitrogen control, were set up in triplicate (question 1) using water from each lake type compared: mesotrophic and eutrophic (question 2). We found chlorophyll-a concentration was higher in the eutrophic relative to the mesotrophic lake, and increased more following high levels of nitrate and ammonium addition in the eutrophic waters. Microcystin was ~750x higher in the sedimentation than in the water column. The sedimentation microbiome community was different in each lake and each lake responded to nitrogen additions differently. The eutrophic lake responded to nitrogen additions more strongly.
- Land use
- Microbial ecology
- Climate change
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Presenters/Authors
Janaye Hanschu
(), University of Kansas, janayeh@ku.edu;
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