2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/20/2019 | 9:15 AM - 9:30 AM | THE NET EFFECTS OF STRATIFICATION AND MIXING ON CYANOBACTERIA ACROSS THE COMPLETE LIFE CYCLE | 150 DEF

THE NET EFFECTS OF STRATIFICATION AND MIXING ON CYANOBACTERIA ACROSS THE COMPLETE LIFE CYCLE

Cyanobacteria are increasing in freshwater lakes worldwide, with adverse consequences for ecosystem function. These increases are expected to continue, since cyanobacteria typically dominate phytoplankton communities in deep temperate lakes under warmer, more strongly stratified conditions. However, these forecasts ignore the fact that most bloom-forming taxa overwinter on or near the sediments, and thus must recruit into the water column to initiate new blooms. Moreover, many climate change scenarios for mesic north temperate regions predict an increase in high-intensity storms, which will increase episodic during otherwise thermally-stable summers. We have developed a simulation model to explore the net effects of stratification and mixing on cyanobacteria by considering their contrasting effects on benthic vs. pelagic life history stages. Informed by field data, the model includes adverse effects of episodic mixing on active pelagic colonies, but positive ffects of mixing on the return of benthic cyanobacteria to the water column. Results to date suggest that both benthic life stages and episodic mixing events need to be considered when forecasting how cyanobacteria will respond to global climate change, especially when recruitment is key to initiating blooms.

Phytoplankton
Modeling
Management

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Presenters/Authors

Kathryn Cottingham (), Dartmouth College, Kathryn.L.Cottingham@dartmouth.edu;