2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/20/2019 | 2:45 PM - 3:00 PM | OXYGEN, PH, AND LABILE ORGANIC CARBON AS POSSIBLE MECHANISMS FOR ALGAL STIMULATION OF BACTERIAL AND FUNGAL PRODUCTION IN PERIPHYTON | 151 ABC

OXYGEN, PH, AND LABILE ORGANIC CARBON AS POSSIBLE MECHANISMS FOR ALGAL STIMULATION OF BACTERIAL AND FUNGAL PRODUCTION IN PERIPHYTON

Previous studies have documented stimulation of periphytic microbial heterotrophs by algal photosynthesis, however the exact mechanisms for this stimulation remain unknown. We incubated submerged Typha domingensis leaf litter in greenhouse mesocosms under high and low dissolved nutrient regimes and conducted microbial production assays after 79 or 128 days of colonization. During these short-term assays, we manipulated environmental factors (oxygen, pH, and labile organic carbon) that can be altered by algal photosynthesis to test the hypothesis that one or more of these factors stimulates heterotrophic microbial production in periphyton communities. During the day 79 assays, fungal production was simulated by photosynthesis in the high nutrient treatment (p= 0.0009) and bacterial production was increased by glucose addition in the low nutrient treatment (p= 0.043). Analysis of day 128 assays is ongoing. Our preliminary results confirm that algal photosynthesis can increase heterotrophic microbial production, and suggest that photosynthetic labile organic carbon production could be a stimulatory mechanism. This research has the potential to identify the role of photosynthesis as a stimulator of ecosystem-level processes in aquatic ecosystems.

Periphyton
Algae
Primary Production

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Presenters/Authors

Jennifer Harper (), Biology Department, Eastern Michigan University, jharpe18@emich.edu;