Frontiers in Marine Science,
Год журнала:
2024,
Номер
11
Опубликована: Окт. 8, 2024
Introduction
Archaeal
communities
play
a
crucial
role
in
marine
ecosystems,
yet
our
understanding
of
their
ecological
and
functional
traits
remains
incomplete.
This
study
focuses
on
northern
Hangzhou
Bay
to
fill
gaps
knowledge
regarding
the
biogeography
functionality
archaeal
groups.
Methods
We
utilized
high-throughput
sequencing
dataset
based
16S
rRNA
gene
characterize
community,
aiming
identify
biogeographic
patterns
assess
influence
environmental
factors
community
structure.
Results
The
predominant
phyla
identified
were
Woesearchaeota,
Thaumarchaeota,
Euryarchaeota
,
Crenarchaeota
.
structure
sediments
showed
geographical
pattern
along
gradient,
influenced
by
such
as
salinity,
ammonium,
total
phosphorus,
pH,
nitrogen
content.
Network
analysis
revealed
nonrandom
co-occurrence
patterns,
with
associations
changing
salinity
gradient.
Additionally,
this
directly
proved
existence
dispersal
limitation
strongly
connected
system
through
null
model
analyses.
Variation
was
attributed
both
constraints
stochastic
processes
due
limitation.
Furthermore,
results
that
key
biogeochemical
functions
also
exhibited
clear
differences
appear
be
critical
roles
diversity
highlighted.
Discussion
All
these
findings
enhance
microbial
ecology
element
transformation
estuarine
environments.
highlighted
function
underscore
complexity
ecosystems.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(21)
Опубликована: Янв. 31, 2024
Abstract
Electrochemical
conversion
of
nitrate
offers
an
efficient
solution
to
pollution
and
a
sustainable
strategy
for
ammonia
generation.
Cu
Fe
bimetallic
electrocatalysts
exhibit
excellent
electrochemical
reduction
(NO
3
RR)
reactivity
but
the
conventional
preparation
is
complex
time‐consuming
this
reaction
still
suffers
from
unsatisfied
kinetic
unidentified
mechanisms.
Herein,
in
situ
electrodeposition
employed
induce
modify
active
sites
iron‐based
N‐doping
carbon
nanofiber
electrode
(Fe/Fe
C@NCNFs)
during
NO
RR
Cu‐contained
solution.
Benefiting
synergistic
effect
between
Cu─Fe/Fe
C@NCNFs
electrode,
superior
activity
rate‐determining
(*NO
*NO
2
)
reduced
energy
barriers
following
deoxidation
hydrogenation
steps
are
achieved.
Compared
with
Fe/Fe
C@NCNFs‐500,
pseudo‐first‐order
(PFO)
rate
constant
by
demonstrates
nearly
two‐fold
improvement
high
current
efficiencies
over
wide
pH
voltage
range.
Furthermore,
maximum
─N
removal
capacity
N
selectivity
reach
15593.8
mg
g
−1
ca.
92%
after
twenty
cycles.
This
work
avenue
highly
design,
paving
more
insights
into
interactions
site
construction
performance.
Environment International,
Год журнала:
2024,
Номер
185, С. 108546 - 108546
Опубликована: Март 1, 2024
Mangrove
wetlands
are
hotspots
of
the
global
nitrogen
(N)
cycle
and
important
sinks
microplastics
(MPs)
due
to
their
ecotone
location
between
terrestrial
marine
ecosystems.
However,
effects
MPs
on
N
processes
in
mangrove
ecosystems
still
poorly
understood.
Thus,
present
study
assessed
impacts
by
adding
sediments
a
microcosm
incubation
experiment.
The
results
showed
that
increased
dissolved
organic
carbon
nitrate
but
reduced
ammonium
contents
sediments.
C:N
stoichiometric
N:C-acquiring
enzymatic
ratios,
indicating
an
intensified
limitation
following
exposure
MPs.
decreased
microbial
community
diversity
shifted
sediment
communities
from
r-
K-strategists,
consistent
with
limitation.
In
response,
dissimilatory
reduction
(DNRA)
rates
while
nitrous
oxide
(N2O)
production
suggesting
more
efficient
utilization
treatments.
heteroatoms
such
as
PLA-
PVC-MPs,
DNRA
67.5–78.7%,
exhibiting
stronger
impact
than
PE-MPs.
variation
partitioning
analysis
revealed
variances
N2O
could
be
attributed
synergistic
physicochemical
properties,
nutrient
limitation,
Overall,
this
provides
pertinent
insights
into
new
source
turnover
Frontiers in Marine Science,
Год журнала:
2024,
Номер
11
Опубликована: Июнь 3, 2024
Coastal
eutrophication
is
a
major
issue
of
marine
pollution.
The
main
factors
controlling
must
be
identified
to
ensure
effective
environmental
management
according
the
respective
local
conditions.
Zhanjiang
Bay
(ZJB),
located
northwest
South
China
Sea,
semi-closed
bay
influenced
by
complex
water
flows
and
development
surrounding
cities.
In
this
study,
we
investigated
nutrient
concentrations
compositions
in
ZJB
seawater
over
past
20
years
influencing
based
on
several
field
investigations
from
2006
2022
historical
data.
High
dissolved
inorganic
phosphorus
(DIP)
nitrogen
(DIN)
were
contributors
severe
long-term
ZJB;
however,
light
was
observed
outer
bay,
primarily
caused
chemical
oxygen
demand
(COD)
DIP.
primary
sources
COD
nutrients
riverine
freshwater,
sewage
outfalls,
mariculture
domestic
effluents
carried
rivers.
Tidal
effects
diluted
with
thereby
playing
key
role
redistribution.
DIN:
DIP
ratio
showed
restriction
excess
phosphorus,
owing
activities.
Marine
undertakings
can
exert
various
impacts
quality.
Eliminating
illegal
aquaculture
launching
tailwater
treatment
improve
quality,
whereas
practices
such
as
channel
dredging
may
worsen
it.
This
study
demonstrates
intricate
dynamics
ecosystem
offers
valuable
insights
for
conservation
efforts.
The
growth
of
animal
aquaculture
requires
ever
more
feed.
Yet,
fish
and
crustacean
farming
is
argued
to
be
sustainable
because
wild
use
low
has
improved
over
time.
Here,
accounting
for
trimmings
by-products
from
in
feed,
using
four
different
sources
industry-reported
feed
composition
data,
we
find
ratios
inputs
farmed
outputs
0.36
1.15—27
307%
higher
than
a
previous
estimate
0.28.
Furthermore,
metric
that
incorporates
mortality
during
capture
excludes
unfed
systems
raises
the
mortality–to–farmed
output
ratio
0.57
1.78.
We
also
evaluate
terrestrial
ingredients
feeds.
Widely
cited
estimates
declines
1997
2017
entailed
trade-off
fivefold
increase
crops
same
period.
Our
assessment
challenges
sustainability
fed
its
role
food
security.
Frontiers in Microbiology,
Год журнала:
2024,
Номер
15
Опубликована: Июль 9, 2024
The
nitrogen
(N)
cycle
is
the
foundation
of
biogeochemistry
on
Earth
and
plays
a
crucial
role
in
global
climate
stability.
It
one
most
important
nutrient
cycles
high-altitude
lakes.
almost
entirely
dependent
redox
reactions
mediated
by
microorganisms.
However,
cycling
microbial
communities
saline
lakes
Qinghai-Tibet
Plateau
(QTP),
world's
"third
pole"
has
not
been
investigated
extensively.
In
this
study,
we
used
metagenomic
approach
to
investigate
four
pristine
Altun
mountain
QTP.
We
observed
that
Frontiers in Microbiology,
Год журнала:
2024,
Номер
15
Опубликована: Июль 12, 2024
Invasive
Spartina
alterniflora
(
S.
)
has
significant
impacts
on
sediment
biogeochemical
cycling
in
the
tidal
wetlands
of
estuaries
and
coasts.
However,
impact
exotic
invasion
greenhouse
gases
(GHGs)
production
dynamics
sediments
remain
limited.
Here,
we
investigated
physicochemical
properties,
GHGs
rates,
microbial
gene
abundances
a
native
Cyperus
malacensis
habitat
three
invasive
habitats
(6-,
10-,
14-year)
Minjiang
River
Estuary,
China.
The
methane
(CH
4
),
carbon
dioxide
(CO
2
nitrous
oxide
(N
O)
rates
varied
both
spatially
seasonally,
while
(bacterial
fungal
abundances)
organic
matter
(TOC
TN)
only
spatially.
were
also
characterized
by
higher
values
surface
(0–10
cm)
compared
to
subsurface
(10–20
seasonal
variations
with
summer
than
winter.
can
significantly
increase
CH
CO
matter,
p
<
0.05).
Temperature,
most
dominating
factor
controlling
spatio-temporal
rates.
Overall,
our
findings
highlighted
role
regulating
coastal
wetland
provided
fundamental
data
for
estimating
emissions
sequestration
complex
wetlands.
Frontiers in Microbiology,
Год журнала:
2024,
Номер
15
Опубликована: Июль 22, 2024
Water
reservoir
sediments
represent
a
distinct
habitat
that
harbors
diverse
microbial
resources
crucial
for
nitrogen
cycling
processes.
The
discovery
of
resuscitation
promoting
factor
(Rpf)
has
been
recognized
as
development
in
understanding
the
potential
populations.
However,
our
relationship
between
microorganisms
containing
