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Ecosystem Metabolism: Response to Storm Events

Ecosystem Metabolism: Response to Storm Events. Susanna Scott Miami University. Storms and Ecosystem Metabolism. Climate change predictions estimate an increase in the frequency of large magnitude storms

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Ecosystem Metabolism: Response to Storm Events

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  1. Ecosystem Metabolism: Response to Storm Events Susanna Scott Miami University

  2. Storms and Ecosystem Metabolism • Climate change predictions estimate an increase in the frequency of large magnitude storms • Understanding the influence of storm events on whole ecosystem metabolism gives new insights about the functioning of the biota in these systems • Previous work involving storm events on ecosystem metabolism have focused on season long effects1 • No studies investigating the effects of individual storms 1 Tsai et. al 2008

  3. Questions • How is reservoir ecosystem metabolism influenced by storm events? • Oxygen concentration • NEP, GPP, R

  4. EcosystemMetabolism • PhotosynthesisRespiration • CO2 + H2O C6H12O6 Gross Primary Productivity (GPP) – the assimilation of inorganic C Respiration (R)- the release of CO2 and uptake of O2 Net Ecosystem Production (NEP) – a measure of the trophic status of an ecosystem NEP = GPP – R

  5. EcosystemMetabolism Quantification of biological activity Estimated from diel oxygen cycles DAY:NEP= GPP- R Night: R = ΔO2/Δt Day Night

  6. Reservoirs • Large watersheds • Landscape influence • Inputs of suspended sediments and nutrients

  7. Storms in Reservoirs Inputs from the landscape during storm events may influence ecosystem metabolism • Nutrients Phytoplankton productivity Microbial productivity • Sediments Phytoplankton productivity Microbial productivity • Water/flushing biota All productivity Bing Maps

  8. Sampling Methods Inflow Ecosystem Metabolism Acton Lake: In situ high-frequency data taken at the outflow with buoy. Outflow Bing Maps

  9. Buoy parameters • Surface Temperature • Temperature at depth • pH • Dissolved Oxygen (DO) • Turbidity • Chlorophyll

  10. Data collected at 15 min intervals • Buoy data should allow us to model ecosystem response and resilience to storm event.

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