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
Ecotoxicology and Environmental Safety,
Journal Year:
2024,
Volume and Issue:
280, P. 116476 - 116476
Published: May 31, 2024
Rural
waste
accumulation
leads
to
heavy
metal
soil
pollution,
impacting
microbial
communities.
However,
knowledge
gaps
exist
regarding
the
distribution
and
occurrence
patterns
of
bacterial
communities
in
multi-metal
contaminated
profiles.
In
this
study,
high-throughput
16
S
rRNA
gene
sequencing
technology
was
used
explore
response
various
pollution
rural
simple
dumps
karst
areas
Southwest
China.
The
study
selected
three
habitats
center,
edge,
uncontaminated
dump
evaluate
main
factors
driving
change
community
composition.
Pollution
indices
reveal
severe
contamination
across
all
elements,
except
for
moderately
polluted
lead
(Pb);
severity
ranks
as
follows:
Mn
>
Cd
Zn
Cr
Sb
V
Cu
As
Pb.
Proteobacteria,
Actinobacteria,
Chloroflexi,
Acidobacteriota
predominate,
collectively
constituting
over
60%
relative
abundance.
Analysis
Chao
Shannon
demonstrated
that
center
boasted
greatest
richness
diversity.
Correlation
data
indicated
a
predominant
synergistic
interaction
among
landfill's
community,
with
higher
number
positive
associations
(76.4%)
compared
negative
ones
(26.3%).
Network
complexity
minimal
at
dump's
edge.
RDA
analysis
showed
Pb(explained:46%)
Mn(explained:21%)
were
key
causing
difference
composition
edge
area
dump,
AK(explained:42.1%)
Cd(explained:35.2%)
dump.
This
provides
important
information
understanding
patterns,
co-occurrence
networks,
environmental
mechanisms
landfill
soils
under
stress,
which
helps
guide
formulation
treatment
remediation
strategies.
