2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/05/2017 | 11:00 AM - 11:15 AM | BEYOND N AND P: TRACE METAL LIMITATION OF ALGAL PRODUCTION | 306B
BEYOND N AND P: TRACE METAL LIMITATION OF ALGAL PRODUCTION
Algae require more than 20 different elements, yet the vast majority of what is known about nutrient limitation in stream ecosystems focuses on just N and P. Trace metals are required for electron transfer proteins used in photosynthesis and respiration and enzymes that catalyze N and P acquisition. Anthropogenic activity has altered elemental loading to stream ecosystems, however trace metal loading is frequently uncorrelated with N and P. The disconnect between nutrient and trace metal concentrations and dual requirements for metals and macronutrients within the same biochemical pathway suggests that low metal concentrations may limit nutrient uptake through co-limitation. We present data from streams in the Great Lakes basin that show potential trace metal limitation in both pristine and human-dominated watersheds. Furthermore, we used trace metal nutrient diffusing substrates (tNDS) with different combinations of elements to show that metal–nutrient co-limitation of algae was observed in >50% of study streams, and Zn–P co-limitation was common in streams low in dissolved inorganic P. We suggest that trace metals must be considered to fully resolve bottom-up drivers of stream primary production.
- C10 Biogeochemistry
- C32 Primary and Secondary Production
- S19 Elements and energy as fundamental currencies of nature: using ecological stoichiometry as a tool to advance the sustainability of freshwater ecosystems
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Presenters/Authors
David Costello
(), Kent State University, dcostel3@kent.edu;
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Andrea Fitzgibbon
(), Kent State University , afitzgib@kent.edu;
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