2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2018 | 10:00 AM - 10:15 AM | THE ROLE OF PHOSPHORUS AND LIGHT IN AQUATIC MICROBIAL PRIMING | 321
THE ROLE OF PHOSPHORUS AND LIGHT IN AQUATIC MICROBIAL PRIMING
The aquatic priming effect (PE) hypothesis states recalcitrant organic matter (ROM) has increased decomposition in low-nutrient environments when labile organic matter (LOM), (e.g. dissolved organic carbon (DOC)), is added. Likewise, ROM decomposition decreases with increases in available nutrients and C. Anthropogenic activities can alter the amount of nutrients and light reaching headwaters, where these inputs are usually limited, potentially altering OM decomposition via microbial priming. This has important implications in how humans influence large-scale C and nutrient flux. We performed a recirculating stream mesocosm experiment manipulating phosphorus (P) and light to investigate how autotrophic and heterotrophic microbes would be affected and interact to affect ROM decomposition. Light-time and light-P interactions drove increases in suspended (p=0.001) and detrital (p=0.0036) algal biomass, respectively. Light-time interaction drove increased DOC (p=0.029). Time and P (p=<0.001; 0.008, respectively) drove increased heterotrophic biomass. These results agree with other studies showing increases in algal biomass resulted in elevated DOC inputs that may have stimulatory effects on heterotrophic microbes, especially in low-nutrient environments. We calculated PE as an effect size (ambient-shade treatments) within P concentrations for ROM. Our results indicate light and nutrients may mediate aquatic microbial priming.
- Detritus
- Mesocosm
- Biofilm
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Presenters/Authors
Brooke Howard-Parker
(), University of Arkansas, bbhowardparker@gmail.com;
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Brendon White
(), University of Arkansas, blw023@email.uark.edu;
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Michelle Evans-White
(), University of Arkansas, mevanswh@uark.edu;
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