2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/05/2017 | 12:15 PM - 12:30 PM | DISSOLVED ORGANIC CARBON AS A POTENTIAL VECTOR FOR METAL BIOACCUMULATION IN AQUATIC FOOD WEBS | 305B
DISSOLVED ORGANIC CARBON AS A POTENTIAL VECTOR FOR METAL BIOACCUMULATION IN AQUATIC FOOD WEBS
Understanding factors impacting biotic uptake of toxic metals is critical to predicting effects to aquatic biota. The bioavailability framework used for some metals, including copper, is the Biotic Ligand Model (BLM). Two striking features of the BLM are 1) the model estimates availability from the dissolved phase only, ignoring dietary exposure, and 2) The underlying chemical speciation models predict most dissolved copper is not freely available in the water column, and instead is bound by dissolved organic carbon (DOC). We argue this pool of DOC-bound metal may be available to aquatic organisms which consume DOC via the microbial loop. To test this, we exposed filter-feeding black flies, Simulium vittatum, which use the microbial loop, and shredding amphipods, Hyalella Azteca, which do not, to a gradient of copper concentrations in the presence or absence of labile and recalcitrant DOC. Our data suggest that DOC was protective of copper uptake for Hyalella, but not for Simulium, likely due to consumption of DOC. Collectively, these data suggest DOC is not protective of metal accumulation for all aquatic organisms as the BLM assumes.
- C13 Ecotoxicology
- C31 Organic Matter Processing
- S03 Stressing the 'Eco' in Freshwater Ecotoxicology
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Presenters/Authors
Nathan Tomczyk
(), University of Georgia, nathan.tomczyk@gmail.com;
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Thomas Parr
(), University of Oklahoma, Thomas.parr@ou.edu;
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Krista Capps
(), University of Georgia, kcapps@uga.edu;
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