2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2021 | 2:00 PM - 3:30 PM | INVERTEBRATE BIOTURBATION-MEDIATED NUTRIENT FLUXES UNDER VARIOUS WATER OXYGEN CONDITIONS IN A SHALLOW TURBID BAY | Virtual Platform
INVERTEBRATE BIOTURBATION-MEDIATED NUTRIENT FLUXES UNDER VARIOUS WATER OXYGEN CONDITIONS IN A SHALLOW TURBID BAY
Freshwater aquatic sediments are teeming with thousands of invertebrates per m2, yet we lack an understanding of how invertebrates contribute to nutrient recycling and burial. Bioturbating invertebrates burrow/rework sediment which introduces oxygenated water to anoxic sediments and alters the rate and directionality of nutrient fluxes. Roles that bioturbators play in ecosystem functioning likely differ under changing environmental conditions. Using an intact core flow-through experiment with sediments from Sandusky Bay, Ohio, we measured how chironomid larvae bioturbation and excretion alter nutrient fluxes using ambient and elevated bioturbator densities under periods of oxic, hypoxic, and alternating water oxygen conditions. Preliminary results suggest that nitrate is removed from surface water under all oxygen conditions, likely via different mechanisms. Elevated bioturbator densities appear to facilitate greater fluxes of nitrate compared to ambient invertebrate densities in oxic and alternating oxygen conditions. Sulfate is released in oxic and alternating treatments, indicating oxygen’s role in facilitating sulfate release. Phosphate flux was dominated by physical processes under oxic and alternating oxygen but phosphate release under hypoxic conditions was exacerbated by bioturbation activity. Shifting oxygen conditions appear to shape how bioturbators contribute to internal loading within shallow water ecosystems.
- Nutrient cycling
- Biological effects
- Nutrients
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Presenters/Authors
Taylor Michael
(), Kent State University, tmichae9@kent.edu;
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Lauren Kinsman-Costello
(), Kent State University, lkinsman@kent.edu;
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David Costello
(), Kent State University, dcostel3@kent.edu;
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