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2013 ; 7
(6
): 1080-91
Nephropedia Template TP
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English Wikipedia
Speedy speciation in a bacterial microcosm: new species can arise as frequently
as adaptations within a species
#MMPMID23364353
Koeppel AF
; Wertheim JO
; Barone L
; Gentile N
; Krizanc D
; Cohan FM
ISME J
2013[Jun]; 7
(6
): 1080-91
PMID23364353
show ga
Microbiologists are challenged to explain the origins of enormous numbers of
bacterial species worldwide. Contributing to this extreme diversity may be a
simpler process of speciation in bacteria than in animals and plants, requiring
neither sexual nor geographical isolation between nascent species. Here, we
propose and test a novel hypothesis for the extreme diversity of bacterial
species-that splitting of one population into multiple ecologically distinct
populations (cladogenesis) may be as frequent as adaptive improvements within a
single population's lineage (anagenesis). We employed a set of experimental
microcosms to address the relative rates of adaptive cladogenesis and anagenesis
among the descendants of a Bacillus subtilis clone, in the absence of competing
species. Analysis of the evolutionary trajectories of genetic markers indicated
that in at least 7 of 10 replicate microcosm communities, the original population
founded one or more new, ecologically distinct populations (ecotypes) before a
single anagenetic event occurred within the original population. We were able to
support this inference by identifying putative ecotypes formed in these
communities through differences in genetic marker association, colony morphology
and microhabitat association; we then confirmed the ecological distinctness of
these putative ecotypes in competition experiments. Adaptive mutations leading to
new ecotypes appeared to be about as common as those improving fitness within an
existing ecotype. These results suggest near parity of anagenesis and
cladogenesis rates in natural populations that are depauperate of bacterial
diversity.