Frontiers in Microbiology,
Journal Year:
2024,
Volume and Issue:
15
Published: Aug. 26, 2024
Bacteria
play
a
crucial
role
in
pollutant
degradation,
biogeochemical
cycling,
and
energy
flow
within
river
ecosystems.
However,
the
underlying
mechanisms
governing
bacterial
community
assembly
their
response
to
environmental
factors
at
seasonal
scales
subtropical
rivers
remain
poorly
understood.
In
this
study,
we
conducted
16S
rRNA
gene
amplicon
sequencing
on
water
samples
from
Liuxi
River
investigate
composition,
processes,
co-occurrence
relationships
of
communities
during
wet
season
dry
season.
The
results
demonstrated
that
differences
hydrochemistry
significantly
influenced
composition
communities.
A
more
heterogeneous
structure
increased
alpha
diversity
were
observed
Water
temperature
emerged
as
primary
driver
for
changes
Dispersal
limitation
predominantly
governed
assembly,
however,
season,
its
contribution
due
decreased
immigration
rates.
Co-occurrence
network
analysis
reveals
mutualism
played
prevailing
shaping
structure.
Compared
exhibited
higher
modularity,
competition,
keystone
species
resulting
stable
Although
displayed
distinct
variations,
Proteobacteria
Actinobacteria
consistently
abundant
maintaining
both
seasons.
Our
findings
provide
insights
into
how
respond
changes,
uncovering
rivers,
which
are
effective
management
conservation
riverine
Microorganisms,
Journal Year:
2024,
Volume and Issue:
12(12), P. 2458 - 2458
Published: Nov. 29, 2024
Soil
microbial
communities
are
particularly
sensitive
to
selenium
contamination,
which
has
seriously
affected
the
stability
of
soil
ecological
environment
and
function.
In
this
study,
we
applied
high-throughput
16S
rRNA
gene
sequencing
examine
effects
low
high
doses
sodium
selenite
selenite-degrading
bacterium,
Rhodococcus
qingshengii
PM1,
on
bacterial
community
composition,
diversity,
assembly
processes
under
controlled
laboratory
conditions.
Our
results
indicated
that
strain
PM1
were
key
predictors
structure
in
selenium-contaminated
soils.
Exposure
initially
led
reductions
diversity
a
shift
dominant
groups,
an
increase
Actinobacteria
decrease
Acidobacteria.
Sodium
significantly
reduced
simplified
co-occurrence
networks,
whereas
inoculation
with
partially
reversed
these
by
enhancing
complexity.
Ecological
modeling,
including
normalized
stochasticity
ratio
(NST)
Sloan’s
neutral
model
(NCM),
suggested
stochastic
predominated
stress.
Null
analysis
further
revealed
heterogeneous
selection
drift
primary
drivers
turnover,
promoting
species
dispersal
buffering
against
negative
impacts
selenium.
These
findings
shed
light
mechanisms
contamination
highlight
potential
for
bioremediation
selenium-affected
ISME Communications,
Journal Year:
2024,
Volume and Issue:
5(1)
Published: Dec. 27, 2024
Abstract
Pteris
vittata,
renowned
for
its
ability
to
hyperaccumulate
arsenic,
presents
a
promising
solution
the
escalating
issue
of
global
soil
arsenic
contamination.
This
fern
cultivates
unique
underground
microbial
community
enhance
environmental
adaptability.
However,
our
understanding
assembly
process
and
long-term
ecological
impacts
this
remains
limited,
hindering
development
effective
remediation
strategies.
study
addresses
gap
by
investigating
soil–root
habitats
from
three
geographically
diverse
fields
comprising
gradient
contamination,
complemented
time-scale
greenhouse
experiment.
Field
investigations
reveal
that
stress
influences
dynamics
in
rhizosphere
enhancing
processes
homogeneous
selection.
Greenhouse
experiments
further
exposure
alters
trajectory
communities
promoting
key
modules.
Specifically,
increases
enrichment
core
taxon
(i.e.
Rhizobiaceae)
rhizosphere,
both
field
settings,
boosting
their
abundance
undetectable
levels
0.02%
after
phytoremediation.
Notably,
also
promotes
pathogenic
group
Spirochaetaceae)
increasing
0.1%
greenhouse.
raise
concerns
warrant
investigation
future
phytoremediation
studies.
Overall,
elucidates
microbiome
following
introduction
plant
emphasizes
often-overlooked
on
By
probing
plants,
work
advances
more
nuanced
complex
implications
inherent
processes.
Frontiers in Microbiology,
Journal Year:
2024,
Volume and Issue:
15
Published: Aug. 26, 2024
Bacteria
play
a
crucial
role
in
pollutant
degradation,
biogeochemical
cycling,
and
energy
flow
within
river
ecosystems.
However,
the
underlying
mechanisms
governing
bacterial
community
assembly
their
response
to
environmental
factors
at
seasonal
scales
subtropical
rivers
remain
poorly
understood.
In
this
study,
we
conducted
16S
rRNA
gene
amplicon
sequencing
on
water
samples
from
Liuxi
River
investigate
composition,
processes,
co-occurrence
relationships
of
communities
during
wet
season
dry
season.
The
results
demonstrated
that
differences
hydrochemistry
significantly
influenced
composition
communities.
A
more
heterogeneous
structure
increased
alpha
diversity
were
observed
Water
temperature
emerged
as
primary
driver
for
changes
Dispersal
limitation
predominantly
governed
assembly,
however,
season,
its
contribution
due
decreased
immigration
rates.
Co-occurrence
network
analysis
reveals
mutualism
played
prevailing
shaping
structure.
Compared
exhibited
higher
modularity,
competition,
keystone
species
resulting
stable
Although
displayed
distinct
variations,
Proteobacteria
Actinobacteria
consistently
abundant
maintaining
both
seasons.
Our
findings
provide
insights
into
how
respond
changes,
uncovering
rivers,
which
are
effective
management
conservation
riverine
