Abstract
Marine microbes exhibit seasonal cycles in community composition, yet the key drivers of these patterns and microbial population fidelity to specific environmental conditions remain to be determined. To begin addressing these questions, we characterized microbial dynamics weekly for 3 years at a temperate, coastal site with dramatic environmental seasonality. This high-resolution time series reveals that changes in microbial community composition are not continuous; over the duration of the time series, the community instead resolves into distinct summer and winter profiles with rapid spring and fall transitions between these states. Here, we show that these community shifts involve switching between closely related strains that exhibit either summer or winter preferences. Moreover, taxa repeat this process annually in both this and another temperate coastal time series, suggesting that this phenomenon may be widespread in marine ecosystems. To address potential biogeochemical impacts of these community changes, PICRUSt-based metagenomes predict seasonality in transporters, photosynthetic proteins, peptidases and carbohydrate metabolic pathways in spite of closely related summer- and winter-associated taxa. Thus, even small temperature shifts, such as those predicted by climate change models, could affect both the structure and function of marine ecosystems.
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Acknowledgements
We acknowledge the entire PICO team for help with environmental sampling. This work was supported by grants from the Gordon and Betty Moore Foundation (GBMF3768 to DEH) and the National Science Foundation (OCE1322950 to DEH; OCE1416665 to DEH and ZIJ; and a GRFP award to CSW).
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Ward, C., Yung, CM., Davis, K. et al. Annual community patterns are driven by seasonal switching between closely related marine bacteria. ISME J 11, 1412–1422 (2017). https://doi.org/10.1038/ismej.2017.4
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DOI: https://doi.org/10.1038/ismej.2017.4
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