Redox-specialized bacterioplankton metacommunity in a temperate estuary

This study explored the spatiotemporal dynamics of the bacterioplankton community composition in the Gulf of Finland (easternmost sub-basin of the Baltic Sea) based on phylogenetic analysis of 16S rDNA sequences acquired from community samples via pyrosequencing. Investigations of bacterioplankton i...

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Bibliographic Details
Published in:PloS one 2015-04, Vol.10 (4), p.e0122304-e0122304
Main Authors: Laas, Peeter, Simm, Jaak, Lips, Inga, Lips, Urmas, Kisand, Veljo, Metsis, Madis
Format: Article
Language:English
Subjects:
Analysis
Annual variations
Bacteria
Bacteria - classification
Bacteria - genetics
Bacterioplankton
Carbon compounds
Communities
Community composition
Complex systems
Composition
Dynamic tests
Ecosystem
Environmental conditions
Estuaries
Estuarine environments
Genetic aspects
Inflow
Marine ecosystems
Microorganisms
Niches
Oxidation-Reduction
Oxygen
Phylogenetics
Phylogeny
Physiochemistry
Phytoplankton
Plankton
Plankton - classification
Plankton - genetics
Receptors
RNA, Ribosomal, 16S - analysis
rRNA 16S
Salinity
Salinity gradients
Seasonal variations
Seawater - microbiology
Sequence Analysis, RNA
Surface boundary layer
Surface layers
Trace metals
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Summary:This study explored the spatiotemporal dynamics of the bacterioplankton community composition in the Gulf of Finland (easternmost sub-basin of the Baltic Sea) based on phylogenetic analysis of 16S rDNA sequences acquired from community samples via pyrosequencing. Investigations of bacterioplankton in hydrographically complex systems provide good insight into the strategies by which microbes deal with spatiotemporal hydrographic gradients, as demonstrated by our research. Many ribotypes were closely affiliated with sequences isolated from environments with similar steep physiochemical gradients and/or seasonal changes, including seasonally anoxic estuaries. Hence, one of the main conclusions of this study is that marine ecosystems where oxygen and salinity gradients co-occur can be considered a habitat for a cosmopolitan metacommunity consisting of specialized groups occupying niches universal to such environments throughout the world. These niches revolve around functional capabilities to utilize different electron receptors and donors (including trace metal and single carbon compounds). On the other hand, temporal shifts in the bacterioplankton community composition at the surface layer were mainly connected to the seasonal succession of phytoplankton and the inflow of freshwater species. We also conclude that many relatively abundant populations are indigenous and well-established in the area.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0122304