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The Passive Yet Successful Way of Planktonic Life: Genomic and Experimental Analysis of the Ecology of a Free-Living Polynucleobacter Population
TLDR
Experiments indicated that these bacteria live as chemoorganotrophs by mainly utilizing low-molecular-weight substrates derived from photooxidation of humic substances, which resulted in a highly passive lifestyle so far only known among free-living bacteria from pelagic marine taxa dwelling in environmentally stable nutrient-poor off-shore systems.
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Rhodoluna lacicola gen. nov., sp. nov., a planktonic freshwater bacterium with stream-lined genome
TLDR
The combined phylogenetic, phenotypic and chemotaxonomic data clearly suggest that strain MWH-Ta8T represents a novel species of a new genus in the family Microbacteriaceae, for which the name Rhodoluna lacicola gen. nov. is proposed.
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Microdiversification of a Pelagic Polynucleobacter Species Is Mainly Driven by Acquisition of Genomic Islands from a Partially Interspecific Gene Pool
TLDR
Microdiversification of a planktonic freshwater bacterium was studied by comparing 37 Polynucleobacter asymbioticus strains obtained from three geographically separated sites in the Austrian Alps, finding the extent of functional diversification found on this narrow phylogenetic scale is compelling.
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Silvanigrella aquatica gen. nov., sp. nov., isolated from a freshwater lake, description of Silvanigrellaceae fam. nov. and Silvanigrellales ord. nov., reclassification of the order Bdellovibrionales…
TLDR
In-depth phylogenetic analyses based on alignments of 74 protein sequences of a phylogenetically broad range of taxa suggested assignment of the strain to a new order of the class Oligoflexia, which is proposed to establish for strain MWH-Nonnen-W8redT the novel species and genus Silvanigrella aquatica gen. nov.
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Complete ecological isolation and cryptic diversity in Polynucleobacter bacteria not resolved by 16S rRNA gene sequences
TLDR
The revealed ecological isolation and cryptic diversity in Polynucleobacter bacteria is crucial in the interpretation of diversity studies on freshwater bacterioplankton based on ribosomal sequences.
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Rhodoluna limnophila sp. nov., a bacterium with 1.4 Mbp genome size isolated from freshwater habitats located in Salzburg, Austria.
TLDR
The investigated traits suggested that strains 36A-HELLB, 1B-Mac and 27D-LEPIT represent a new species for which the name Rhodolunalimnophila sp.
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Global phylogeography of pelagic Polynucleobacter bacteria: Restricted geographic distribution of subgroups, isolation by distance and influence of climate
TLDR
Physiological tests indicated that almost all strains of the pantropical subgroup failed to grow at temperatures of 4°C, while strains affiliated with other subgroups showed good growth at this temperature, which suggests that thermal adaptation is involved in phylogeographic structuring of the global Polynucleobacter population.
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Contrasting trends in distribution of four major planktonic betaproteobacterial groups along a pH gradient of epilimnia of 72 freshwater habitats.
TLDR
It is emphasized that at least two taxa of freshwater Betaproteobacteria represent ecologically diversified groups and substrate utilization patterns observed in laboratory experiments indicate no coherent group-specific differences in substrate preferences.
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Polynucleobacter difficilis sp. nov., a planktonic freshwater bacterium affiliated with subcluster B1 of the genus Polynucleobacter.
TLDR
It is proposed that the isolate represents a novel species, Polynucleobacter difficilis sp.
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Polynucleobacter wuianus sp. nov., a free-living freshwater bacterium affiliated with the cryptic species complex PnecC.
TLDR
Pairwise average nucleotide identity comparisons of whole-genome sequences suggested that strain QLW-P1FAT50C-4T represents a novel species, for which the name Polynucleobacter wuianus sp.
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