Frontiers in Microbiology,
Journal Year:
2023,
Volume and Issue:
14
Published: Nov. 22, 2023
The
composition
of
bacterial
communities
in
freshwater
ecosystems
is
influenced
by
numerous
factors
including
environmental
conditions
and
biological
interactions.
In
grassland
inland
closed
lakes,
affecting
lake
are
either
exogenous
or
endogenous,
contributing
to
the
formation
distinct
habitats
surface
bottom
waters
communities.
However,
extent
which
selectively
shape
aquatic
systems
remains
unclear.
Therefore,
we
sampled
surface,
middle,
at
13
sampling
points
each
layer.
High-throughput
sequencing
techniques
were
employed
examine
spatial
heterogeneity
community
structure
during
summer
Hulun
Lake,
largest
grassland-type
Inner
Mongolia,
China,
determine
microbial
dynamics
symbiosis
patterns
under
different
habitat
conditions.
Our
results
revealed
a
decrease
diversity
bacterioplankton
community,
changes
environment
from
inputs
endogenous
releases.
Furthermore,
this
alteration
was
concomitant
with
enhanced
co-occurrences
among
microorganisms
water
layers.
This
finding
suggests
that
release
promotes
heightened
symbiotic
interactions,
thereby
facilitating
development
more
complex
modular
structures.
Symbiotic
networks
layers
differentiated
key
species,
ecological
clustering
modules
these
species
demonstrating
dissimilar
preferences.
highly
habitat-specific,
mimicking
responses
total
nitrogen
(TN)
layer,
pH
middle
chemical
oxygen
demand
(COD)
Bacterioplankton
functions
assessed
using
Tax4Fun,
indicating
increased
relative
abundance
genes
nitrogen-fixing
nitrification
potential
metabolism
waters,
respectively.
With
Planctomycetota
Proteobacteria
phyla
as
groups
for
regulating
metabolic
processes,
may
facilitate
depletion
nitrate
while
close
contact
atmosphere
accelerated
Planctomycetota-dominated
fixation
into
lake.
findings
contribute
understanding
vertical
its
network
type
underscoring
role
(exogenous
releases)
formation.
Microbiome,
Journal Year:
2023,
Volume and Issue:
11(1)
Published: July 25, 2023
Abstract
Background
Ferromanganese
nodule-bearing
deep-sea
sediments
cover
vast
areas
of
the
ocean
floor,
representing
a
distinctive
habitat
in
abyss.
These
harbor
unique
conditions
characterized
by
high
iron
concentration
and
low
degradable
nutrient
levels,
which
pose
challenges
to
survival
growth
most
microorganisms.
While
microbial
diversity
ferromanganese
nodule-associated
has
been
surveyed
several
times,
little
is
known
about
functional
capacities
communities
adapted
these
habitats.
Results
Seven
sediment
samples
collected
adjacent
nodules
from
Clarion–Clipperton
Fracture
Zone
(CCFZ)
eastern
Pacific
Ocean
were
subjected
metagenomic
analysis.
As
result,
179
high-quality
metagenome-assembled
genomes
(MAGs)
reconstructed
assigned
21
bacterial
phyla
1
archaeal
phylum,
with
88.8%
MAGs
remaining
unclassified
at
species
level.
The
main
mechanisms
resistance
heavy
metals
for
microorganisms
included
oxidation
(Mn),
reduction
(Cr
Hg),
efflux
(Pb),
synergy
(As),
(Cu).
Iron,
had
highest
content
among
all
metallic
elements,
may
occur
mainly
as
Fe(III)
that
potentially
functioned
an
electron
acceptor.
We
found
diverse
array
CAZymes
did
not
exhibit
higher
community
abundance.
Instead,
obtained
energy
metal
(e.g.,
Mn(II))
sulfur
compounds
using
oxygen
or
nitrate
Chemolithoautotrophic
organisms
(
Thaumarchaeota
Nitrospirota
phyla)
be
potential
manganese
oxidizers.
profile
analysis
dominant
further
indicated
utilization
inorganic
nutrients
redox
reactions
(rather
than
organic
metabolism)
major
adaptive
strategy
used
support
their
nodule
sediments.
Conclusions
This
study
provides
comprehensive
microbes
inhabiting
metal-rich
Our
results
reveal
extensive
redundancy
across
taxa
pathways
transformation,
highly
obtain
nutrition,
participation
various
element
cycles
environments.
Marine Life Science & Technology,
Journal Year:
2024,
Volume and Issue:
6(1), P. 168 - 181
Published: Jan. 23, 2024
Abstract
Hadal
trenches
are
characterized
by
enhanced
and
infrequent
high-rate
episodic
sedimentation
events
that
likely
introduce
not
only
labile
organic
carbon
key
nutrients
but
also
new
microbes
significantly
alter
the
subseafloor
microbiosphere.
Currently,
role
of
in
controlling
composition
hadal
microbiosphere
is
unknown.
Here,
analyses
isotope
a
~
750
cm
long
sediment
core
from
Challenger
Deep
revealed
noncontinuous
deposition,
with
anomalous
14
C
ages
caused
seismically
driven
mass
transport
funneling
effect
trench
geomorphology.
Microbial
community
diverse
enzyme
activities
upper
27
differed
those
at
lower
depths,
probably
due
to
sudden
deposition
differences
redox
condition
matter
availability.
At
microbial
population
numbers,
remained
relatively
constant,
except
some
discrete
depths
altered
activity
phyla
abundance,
possibly
additional
different
magnitude.
Evidence
provided
unique
for
subsurface
Earth’s
deepest
ocean
floor
highlight
need
perform
thorough
analysis
over
large
depth
range
characterize
benthic
populations.
Such
depositional
processes
crucial
shaping
deep-water
geochemical
environments
thereby
deep
biosphere.
npj Biofilms and Microbiomes,
Journal Year:
2024,
Volume and Issue:
10(1)
Published: July 28, 2024
Abstract
Alkaline
lakes
are
extreme
environments
inhabited
by
diverse
microbial
extremophiles.
However,
large-scale
distribution
patterns,
environmental
adaptations,
community
assembly,
and
evolutionary
dynamics
of
communities
remain
largely
underexplored.
This
study
investigated
the
characteristics
on
rare
abundant
taxa
in
alkaline
lake
sediments
west
northwest
China.
We
observed
that
varied
significantly
with
geographical
distance,
while
remained
unaffected
regional
differences.
The
assembly
process
was
influenced
dispersal
limitation,
whilst
were
predominantly
driven
heterogeneous
selection.
Network
analysis
indicated
as
core
species
for
interactions
stability.
Rare
exhibited
higher
speciation
transition
rate
than
taxa,
serving
a
genetic
reservoir
potential
candidates
to
become
abundance
highlighting
their
crucial
role
maintaining
diversity.
These
insights
underscore
significant
influence
ecosystem
biodiversity
stability
lakes.
