2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/25/2021 | 2:00 PM - 3:30 PM | QUANTIFYING NUTRIENT SUFFIENCY AND STARVATION OF CYANOBACTERIA AND OTHER PHYTOPLANKTON IN A DEEP MESOTROPHIC RESERVOIR | Virtual Platform
QUANTIFYING NUTRIENT SUFFIENCY AND STARVATION OF CYANOBACTERIA AND OTHER PHYTOPLANKTON IN A DEEP MESOTROPHIC RESERVOIR
Eutrophication, due to increases in nitrogen and phosphorus, poses a threat to water security locally and globally. To determine the nutrient thresholds that cause algal and cyanobacterial blooms in mesotrophic, deep-water, reservoirs, we performed 5- and 10-day nitrogen (N) and a phosphorus (P) starvation assays in 4-L microcosms from two dominant water reservoirs for the state of UT, USA (Deer Creek Reservoir and Jordanelle Reservoir). Nutrient starvation was induced by adding high levels of background N or P, followed by incremental increases in the nutrient of interest. For both reservoirs, using chlorophyll-a as in indicator for algal growth, we found that for both N and P there was a stepwise increase in algal biomass with increases in either nutrient addition, (N: 0-1 mg/L, P: 0-.08 mg/L), with no visible threshold or plateau to algal growth. A similar pattern was observed for the pigment phycocyanin, an indicator for cyanobacterial growth. The species of cyanobacteria participating in this growth are Anabaena sp, Aphanizomenon flos-aque, Chroococcus sp, Microcysitis sp, Lyngbia sp. Our results suggest potential increases in eutrophication in these reservoirs if future loads of either nitrogen or phosphorus increase.
- Nutrients
- Biogeochemistry
- Pollution
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Presenters/Authors
Madeleine Malmfeldt
(), Brigham Young University, mpmalmfeldt@gmail.com;
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Nonfinancial -