2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2018 | 10:15 AM - 10:30 AM | CONTRIBUTION OF "SEED BANKS" TO BACTERIOPLANKTON COMMUNITY DYNAMICS | 310 B
CONTRIBUTION OF "SEED BANKS" TO BACTERIOPLANKTON COMMUNITY DYNAMICS
Many aquatic species contend with fluctuations in their environment by engaging in dormancy, a reversible state of reduced metabolic activity. In addition to buffering against harsh environmental conditions, dormancy generates a "seed bank" that maintains diversity and influences community dynamics. We tracked microbial communities in a southern Indiana lake for 2.5 years by sequencing the 16S rRNA gene (DNA) and transcripts (RNA). Because it is an ephemeral molecule that is essential for protein synthesis, we treat RNA as a proxy for metabolically "active" taxa, while DNA sequences reflect the "total" community consisting of taxa that are either active or dormant. We found that the active bacterial community was highly seasonal and predictable, while the inactive and transient subsets of the community displayed weaker seasonal trends. Taxa responded to seasonal environmental variation in different ways, with some taxa showing more predictable population dynamics than others. We also found evidence that persistently rare species may be regulated by strong negative frequency dependence. Overall, our results suggest that bacterioplankton dynamics track environmental variability closely, which may be aided by a potentially dynamic microbial seed bank.
- Community
- Temporal
- Microbial
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Presenters/Authors
Nathan Wisnoski
(), Indiana University, wisnoski@indiana.edu;
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Jay Lennon
(), Indiana University, lennonj@indiana.edu;
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