Abstract
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 71:1-13 (2013) - DOI: https://doi.org/10.3354/ame01661 FEATURE ARTICLE Spatiotemporal distributions of rare bacterioplankton populations indicate adaptive strategies in the oligotrophic ocean Kevin L. Vergin1, Brad Done1, Craig A. Carlson2, Stephen J. Giovannoni1,* 1Department of Microbiology, Oregon State University, Corvallis, Oregon 97331, USA 2Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, California 93106, USA *‑Corresponding author. Email: steve.giovannoni@oregonstate.edu ABSTRACT: Spatiotemporal distributions of rare microbial taxa were examined in 384 samples from the Bermuda Atlantic Time-series Study (BATS) site, in the northwestern Sargasso Sea. Sequences were partitioned into 6 mutually exclusive sets based on abundance (abundant, rare, and very rare) and frequency of detection (frequent and infrequent). Analyses of variance for taxa that were frequently present, across all levels of abundance, demonstrated environmental filtering, indicating that gradients in environmental factors, such as season and depth, drive community assembly for rare taxa, as they do for abundant taxa. All abundant nodal taxonomic units (NTUs) had spatiotemporal periods of rarity, providing a clear demonstration of the role of fluctuating reproductive success in population dynamics, and the role of rare populations as seed banks. An inverse relationship between the number of rare taxa and physical stratification indicates that transport by mixing drives increased community diversity throughout most of the year. Populations of selected copiotrophic taxa varied in episodic patterns that were not tightly entrained to season and depth, indicating that these populations are not governed by the same rules of community assembly that apply to most other taxa and may be adapted to exploit infrequent, unknown disturbances. Overall, the findings support the perspective that the success of most rare populations was driven by the same fundamental patterns of spatiotemporal variation that drove the success of dominant populations, but also indicate potentially important roles for transport by mixing and atypical life histories in determination of community composition. KEY WORDS: Bacterioplankton · Rare · Copiotroph · BATS · PhyloAssigner · Nodal taxonomic unit · NTU · Pyrosequence Full text in pdf format Information about this Feature Article Supplementary material NextCite this article as: Vergin KL, Done B, Carlson CA, Giovannoni SJ (2013) Spatiotemporal distributions of rare bacterioplankton populations indicate adaptive strategies in the oligotrophic ocean. Aquat Microb Ecol 71:1-13. https://doi.org/10.3354/ame01661 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 71, No. 1. Online publication date: November 15, 2013 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2013 Inter-Research.
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