2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 9:45 AM - 10:00 AM | LITTER NUTRIENT CONTENT MEDIATES THE EFFECTS OF PERIPHYTIC ALGAL PHOTOSYNTHESIS ON FUNGAL AND BACTERIAL PRODUCTION IN LITTER-ASSOCIATED MICROBIAL COMMUNITIES | 321
LITTER NUTRIENT CONTENT MEDIATES THE EFFECTS OF PERIPHYTIC ALGAL PHOTOSYNTHESIS ON FUNGAL AND BACTERIAL PRODUCTION IN LITTER-ASSOCIATED MICROBIAL COMMUNITIES
Studies have documented metabolic couplings between autotrophic and heterotrophic microbial communities inhabiting plant litter, establishing the potential for algal stimulation or “priming” of microbial decomposers. Despite this evidence, the importance and magnitude of algal stimulation of microbial heterotrophs remain poorly understood in relation to detrital nutrient quality. We examined photosynthetically-mediated interactions among microbes inhabiting nutrient (N & P) enriched and unenriched litter of Schoenoplectus acutus and Typha angustifolia. We grew natural periphyton communities (algae, bacteria, and fungi) on submerged Schoenoplectus and Typha litter, and then manipulated photosynthesis using the photosystem II inhibitor DCMU while simultaneously quantifying rates of algal, bacterial and fungal productivity. DCMU prevented algal photosynthesis (p ? 0.01) on plant litter. Furthermore, active photosynthesis stimulated both fungal (p ? 0.01) and bacterial (p ? 0.05) productivity. The magnitude of algal stimulatory effects on fungal production were higher in unenriched litter and were significantly related to litter C:N and C:P ratios (p ? 0.05). This study reveals that periphytic algae directly influence heterotrophic microbial decomposers and that the strength of algal stimulatory effects may decrease under detrital nutrient enrichment.
- Microbial
- Biofilm
- Nutrients
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Presenters/Authors
Kevin Kuehn
(), The University of Southern Mississippi, kevin.kuehn@usm.edu;
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Halvor Halvorson
(), University of Southern Mississippi, Halvor.Halvorson@usm.edu;
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Steve Francoeur
(), Biology Department, Eastern Michigan University, steve.francoeur@emich.edu;
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