2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/20/2019 | 10:15 AM - 10:30 AM | RELATIONSHIPS BETWEEN TRACE METAL-NUTRIENT COLIMITATION IN STREAM BIOFILMS AND SURFACE WATER CHEMISTRY | 250 AB
RELATIONSHIPS BETWEEN TRACE METAL-NUTRIENT COLIMITATION IN STREAM BIOFILMS AND SURFACE WATER CHEMISTRY
Stream biofilms use complex and diverse element sequestration and assimilation mechanisms for growth and metabolism. Trace metals are incorporated in many mechanisms as enzyme cofactors, to support electron transfer proteins for photosynthesis and respiration, or to produce enzymes that allow for use of less common organic nutrient sources. Much of what is understood about stream nutrient limitation focuses on just N and P, although trace metals support several underlying metabolic pathways that may also cause apparent nutrient limitation. We present data from streams in the Great Lakes region that span a gradient of pristine to urban and low to high inorganic and organic nutrient concentrations. We used trace metal nutrient diffusing substrates (tNDS) with different combinations of elements to identify trace metal-nutrient co-limitation of algae and measured surface water chemistry. Stream biofilms responded to multi-element additions more than single-element additions. Zinc and nickel amended treatments showed increased algal biofilm growth across 60% of streams. Colimitation was observed most frequently in streams with low dissolved inorganic nutrients; however, colimitation was also observed in urban streams. These data suggest that colimitation is common and trace metal-nutrient colimitation is complex and overlooked.
- Periphyton
- Metabolism
- Metals
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Presenters/Authors
Andrea Fitzgibbon
(), Kent State University , afitzgib@kent.edu;
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David Costello
(), Kent State University, dcostel3@kent.edu;
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