2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2019 | 9:00 AM - 9:15 AM | STRUCTURAL AND FUNCTIONAL TRAJECTORIES OF BIOFILM COMMUNITY SUCCESSION | 151 ABC
STRUCTURAL AND FUNCTIONAL TRAJECTORIES OF BIOFILM COMMUNITY SUCCESSION
Limited understanding of biofilm community succession precludes our ability to forecast short-term responses of stream ecosystems to pressing environmental problems such as increasing sediment loads or flooding frequency. To examine succession trajectories of biofilm structure and function we employed artificial streams in which epilithic biofilms were first developed to mature stages and then exposed to flooding disturbances of contrasting intensity. Over a 6-week period, we monitored structural (bacteria and algal abundance and diversity) and functional (species interactions, nutrient uptake, and enzyme activity) attributes pre and post-disturbance. Diatom abundance increased faster than other algal groups (3.73ug/cm2/d; p <0.001) resulting in mature Melosira-dominated biofilms (18.3±1.3 gAFDM/m2) after approximately 3 weeks. High- and low-intensity floods removed 68 and 54% of the organic matter standing stocks and 71% and 37% of diatom standing stocks, respectively. Biomass-specific N uptake rates (ug N/gAFDM/h) were significantly lower in later (11±2) than early (371±124) stages of biofilm succession, suggesting stronger N-recycling pathways in mature biofilms. Ongoing analysis of co-occurrence microbial networks based on subunit ribosomal RNA genes (16S) assessment and extracellular enzyme activities will provide further assessment of N-recycling pathways and the overall trajectories of biofilm community succession.
- Disturbance
- Sediment
- Periphyton
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Presenters/Authors
Marc Peipoch
(), Stroud Water Research Center, mpeipoch@stroudcenter.org;
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Raven Bier
(), Stroud Water Research Center, rbier@stroudcenter.org;
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Jing Wang
(), Stroud Water Research Center, jwang_hku@163.com;
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Jinjun Kan
(), Stroud Water Research Center, jkan@stroudcenter.org;
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