Volume 15, Issue 9 p. 2489-2504
Research article

Interactions between specific phytoplankton and bacteria affect lake bacterial community succession

Sara F. Paver

Sara F. Paver

Program in Ecology, Evolution, and Conservation Biology, University of Illinois, Urbana, IL, USA

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Kevin R. Hayek

Kevin R. Hayek

School of Integrative Biology, University of Illinois, Urbana, IL, USA

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Kelsey A. Gano

Kelsey A. Gano

Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, USA

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Jennie R. Fagen

Jennie R. Fagen

Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, USA

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Christopher T. Brown

Christopher T. Brown

Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, USA

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Austin G. Davis-Richardson

Austin G. Davis-Richardson

Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, USA

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David B. Crabb

David B. Crabb

Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, USA

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Richard Rosario-Passapera

Richard Rosario-Passapera

Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, USA

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Adriana Giongo

Adriana Giongo

Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, USA

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Eric W. Triplett

Eric W. Triplett

Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, USA

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Angela D. Kent

Corresponding Author

Angela D. Kent

Program in Ecology, Evolution, and Conservation Biology, University of Illinois, Urbana, IL, USA

Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, IL, USA

For correspondence. E-mail [email protected]; Tel. (+1) 217 333 4216; Fax (+1) 217 244 3219.Search for more papers by this author
First published: 09 April 2013
Citations: 78

Summary

Time-series observations and a phytoplankton manipulation experiment were combined to test the hypothesis that phytoplankton succession effects changes in bacterial community composition. Three humic lakes were sampled weekly May–August and correlations between relative abundances of specific phytoplankton and bacterial operational taxonomic units (OTUs) in each time series were determined. To experimentally characterize the influence of phytoplankton, bacteria from each lake were incubated with phytoplankton from one of the three lakes or no phytoplankton. Following incubation, variation in bacterial community composition explained by phytoplankton treatment increased 65%, while the variation explained by bacterial source decreased 64%. Free-living bacteria explained, on average, over 60% of the difference between phytoplankton and corresponding no-phytoplankton control treatments. Fourteen out of the 101 bacterial OTUs that exhibited positively correlated patterns of abundance with specific algal populations in time-series observations were enriched in mesocosms following incubation with phytoplankton, and one out of 59 negatively correlated bacterial OTUs was depleted in phytoplankton treatments. Bacterial genera enriched in mesocosms containing specific phytoplankton assemblages included Limnohabitans (clade betI-A), Bdellovibrio and Mitsuaria. These results suggest that effects of phytoplankton on certain bacterial populations, including bacteria tracking seasonal changes in algal-derived organic matter, result in correlations between algal and bacterial community dynamics.