Resource Partitioning and Sympatric Differentiation Among Closely Related Bacterioplankton
Dana E. Hunt,1*
Lawrence A. David,2*
Dirk Gevers,1,3,4
Sarah P. Preheim,1
Eric J. Alm,1,5
Martin F. Polz1
Identifying ecologically differentiated populations within complex microbial communities remains challenging, yet is critical for interpreting the evolution and ecology of microbes in the wild. Here we describe spatial and temporal resource partitioning among Vibrionaceae strains coexisting in coastal bacterioplankton. A quantitative model (AdaptML) establishes the evolutionary history of ecological differentiation, thus revealing populations specific for seasons and life-styles (combinations of free-living, particle, or zooplankton associations). These ecological population boundaries frequently occur at deep phylogenetic levels (consistent with named species); however, recent and perhaps ongoing adaptive radiation is evident in Vibrio splendidus, which comprises numerous ecologically distinct populations at different levels of phylogenetic differentiation. Thus, environmental specialization may be an important correlate or even trigger of speciation among sympatric microbes.
1 Department of Civil and Environmental Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.
2 Computational and Systems Biology Initiative, MIT, Cambridge, MA 02139, USA.
3 Laboratory of Microbiology, Ghent University, Gent 9000, Belgium.
4 Bioinformatics and Evolutionary Genomics Group, Ghent University, Gent 9000, Belgium.
5 Department of Biological Engineering, MIT, Cambridge, MA 02139, USA, and Broad Instilate of MIT and Harvard University, Cambridge, MA 02139, USA.
* These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: ejalm{at}mit.edu (E.J.A.); mpolz{at}mit.edu (M.F.P.)
