EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/21/2019 | 11:45 AM - 12:00 PM | SPATIAL AND TEMPORAL VARIABILITY OF NUTRIENT DYNAMICS AND ECOSYSTEM METABOLISM IN A HYPER-EUTROPHIC RESERVOIR DURING WET AND DRY YEARS | 250 AB
SPATIAL AND TEMPORAL VARIABILITY OF NUTRIENT DYNAMICS AND ECOSYSTEM METABOLISM IN A HYPER-EUTROPHIC RESERVOIR DURING WET AND DRY YEARS
Climate change is increasing the variability, frequency and severity of precipitation and drought events, with more extreme conditions predicted over the next century. Effects will be pronounced in aquatic ecosystems, where externally supplied resources (e.g., nutrients, organic carbon) drive key ecosystem processes. Yet, we know surprising little about how periods of high and low precipitation affect fluxes of these resources and modulate spatial and temporal patterns of ecosystem function. To address this, we deployed dissolved oxygen probes coupled with high spatial resolution and frequent (daily-weekly) nutrient sampling in Acton Lake, a hyper-eutrophic reservoir with an agricultural watershed. We found that high discharge events during wet years produce ephemeral and spatially explicit effects on both nutrient dynamics and metabolism. Increases in dissolved nutrient concentrations were restricted to areas near stream inlets and returned to pre-storm baseline within days. We found both short-term declines in net ecosystem production and increased ecosystem respiration during individual storm events, and overall higher respiration during wet years. Understanding how hydrologic processes during relatively wet and dry years influence metabolism and nutrient cycling is paramount to preserving ecological integrity and ecosystem services of lakes under future climates.
- ClimateChange
- Nutrients
- Metabolism
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Presenters/Authors
Tanner Williamson
(), Michigan State University, tanner.williamson@gmail.com;
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Michael Vanni
(), Miami University, vannimj@miamioh.edu;
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William Renwick
(), Miami University, wrenwick@miamioh.edu;
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