2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/08/2017 | 10:00 AM - 10:15 AM | SALINITY AND PHOSPHURUS STRUCTURE BACTERIAL DORMANCY IN THE RARE BIOSPHERE OF FRESHWATER AND HYPERSALINE LAKES | 305B
SALINITY AND PHOSPHURUS STRUCTURE BACTERIAL DORMANCY IN THE RARE BIOSPHERE OF FRESHWATER AND HYPERSALINE LAKES
Dormancy is offered as a plausible explanation for the persistence of bacteria under suboptimal conditions. To identify the environmental cues triggering dormancy, bacterial activity needs to be investigated through times as taxa are pushed beyond their optimal conditions. We estimated seasonal bacterial dormancy patterns and identified the lake chemistry influencing activity in six lakes, varying in salinity (0.05% – 30.3%), over one year in Utah, USA. Using ribosomal RNA:DNA ratios as an indicator for bacterial activity, we found that within the rare biosphere the proportion of the community exhibiting dormancy was lower in hypersaline than freshwater lakes over the entire year. Based on our mixed effects models, saltier conditions (R2 = 0.89, F = 175.3, P < .001) and higher levels of total phosphorus (TP, R2 = 0.63, F = 37.07, P < .001) reduced the dormancy of rare taxa (relative abundance < 0.1%). Across the lakes, salinity and TP varied through the seasons, but other variables like TN and dissolved oxygen experienced more variation but had little effect on dormancy. Our results suggest that fluctuations in specific cues regulate dormancy contributing to seed banks of rare and inactive individuals.
- C11 Community Ecology
- C10 Biogeochemistry
- C04 Microbial Ecology
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Presenters/Authors
Zachary Aanderud
(), Brigham Young University, zachary_aanderud@byu.edu;
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Tylan Magnusson
(), Brigham Young University, ty.magnusson@gmail.com;
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Alan Harker
(), Brigham Young University, alan_harker@byu.edu;
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