Sustainability,
Journal Year:
2023,
Volume and Issue:
15(24), P. 16591 - 16591
Published: Dec. 6, 2023
Dissolved
inorganic
nutrients
are
pivotal
in
maintaining
the
material
and
energy
balance
of
marine
ecosystems,
impacting
survival
dynamic
succession
organisms.
To
gain
a
deeper
understanding
source
sink
characteristics
dissolved
bays
affected
by
human
activities
to
elucidate
processes
involving
filter-feeding
shellfish
relation
these
nutrients,
this
study
investigated
dynamics
Dapeng
Cove
sea
area
Shenzhen.
Over
past
decade,
significant
change
N/P
ratio
within
survey
has
been
observed,
suggesting
shift
nutrient
limitation
from
nitrogen
phosphorus
or
phosphorus–silicon
limitation.
This
induced
ratio,
along
with
Si/N
Si/P
ratios,
may
facilitate
growth
cyanobacteria
and,
subsequently,
alter
proportions
diatoms,
dinoflagellates,
cyanobacteria.
Seasonal
fluctuations
disturbance
intensity
precipitation
determine
seasonal
spatial
distribution
bay,
thereby
influencing
bay
ecosystem
metabolism.
The
Land–Ocean
Interactions
Coastal
Zone
(LOICZ)
model
analysis
revealed
that
represents
major
phosphate
spring,
summer,
autumn,
while
acting
as
for
winter.
Furthermore,
rivers
groundwater
represent
primary
sources
bay.
exhibits
an
annual
net
metabolic
rate
7.06
mmol
C/m2/d,
denitrification
dominating
cycle
at
12.65
C/m2/d.
Overall,
displays
production
exceeding
respiration,
classifying
it
autotrophic
system.
Additionally,
is
predominantly
driven
denitrification.
also
impact
oyster
proliferation
on
physical
chemical
factors
surveyed
relatively
weaker
than
surface
runoff
inputs.
Sustainability,
Journal Year:
2024,
Volume and Issue:
16(5), P. 2112 - 2112
Published: March 3, 2024
Nitrogen-rich
wastewater
is
a
major
environmental
issue
that
requires
proper
treatment
before
disposal.
This
comprehensive
overview
covers
biological,
physical,
and
chemical
nitrogen
removal
methods.
Simultaneous
nitrification–denitrification
(SND)
most
effective
in
saline
water
when
utilizing
both
aerobic
anoxic
conditions
with
diverse
microbial
populations
for
removal.
Coupling
anammox
denitrification
could
increase
rates
reduce
energy
demand.
Suspended
growth
bioreactors
effectively
treated
COD/N
ratios
demonstrated
resilience
to
low
C/N
ratios.
Moving
biofilm
exhibit
reduced
mortality
rates,
enhanced
sludge–liquid
separation,
increased
efficiency,
stronger
biological
structures.
SND
studies
show
≥90%
total
efficiency
(%RETN)
setups,
Defluviicoccus,
Nitrosomonas,
Nitrospira
as
the
main
communities,
while
anammox–denitrification
achieved
%RETN
of
77%.
Systems
using
polyvinyl
alcohol/sodium
alginate
medium
showed
≥
75%.
Air-lift
reflux
configurations
exhibited
high
%RENH4,
reducing
costs
minimizing
sludge
formation.
Microwave
pretreatment
high-frequency
electric
fields
be
used
improve
%RENH4.
Adsorption/ion
exchange,
membrane
distillation,
ultrafiltration,
nanofiltration
promise
industrial
treatment.
AOPs
sulfate-based
oxidants
eliminate
compounds
from
wastewater.
Tailoring
proposed
treatments
cost-effective
removal,
optimizing
interactions,
analyzing
techno-economics
emerging
technologies
are
crucial.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: March 7, 2024
Abstract
Understanding
how
organisms
have
adapted
to
persist
in
unpredictable
environments
is
a
fundamental
goal
biology.
Bet
hedging,
an
evolutionary
adaptation
observed
from
microbes
humans,
facilitates
reproduction
and
population
persistence
randomly
fluctuating
environments.
Despite
its
prevalence,
empirical
evidence
microalgae,
crucial
primary
producers
carbon
sinks,
lacking.
Here,
we
report
bet-hedging
strategy
the
unicellular
microalga
Haematococcus
pluvialis
.
We
show
that
isogenic
populations
reversibly
diversify
into
heterophenotypic
mobile
non-mobile
cells
independently
of
environmental
conditions,
likely
driven
by
stochastic
gene
expression.
Mobile
grow
faster
but
are
stress-sensitive,
while
prioritise
stress
resistance
over
growth.
This
due
shifts
growth-promoting
activities
(cell
division,
photosynthesis)
resilience-promoting
processes
(thickened
cell
wall,
enlargement,
aggregation,
accumulation
antioxidant
energy-storing
compounds).
Our
results
provide
for
bet
hedging
microalga,
indicating
potential
current
future
conditions
consequently
conservation
ecosystem
functions.
Frontiers in Marine Science,
Journal Year:
2021,
Volume and Issue:
8
Published: Sept. 6, 2021
Hypoxic
events
are
becoming
frequent
in
some
estuaries
and
coastal
waters
due
to
over-enrichment
of
anthropogenic
nutrients,
organic
matter,
and/or
restricted
water
circulation.
The
lagoons
Sri
Lanka
facing
high
population
pressure
lacking
sufficient
infrastructure.
Coastal
may
receive
inputs
natural
or
untreated
nitrogen
phosphorus
wastes,
consequently
result
hypoxic
conditions
while
sluggish
circulation
occurred.
In
this
study,
we
examined
the
spatiotemporal
variability
eutrophication
hypoxia
Negombo
Lagoon,
one
most
productive
sensitive
ecosystems
Lanka.
Based
on
seasonal
measurements
dissolved
oxygen,
chlorophyll-
a
(Chl-
),
particulate
carbon
(POC
DOC),
concluded
that
occurred
both
dry
wet
seasons.
main
contributing
factors
were
seawater
temperature
poor
season
nutrient
loading
combined
with
elevated
POC
DOC
season.
Global Environmental Change,
Journal Year:
2022,
Volume and Issue:
78, P. 102628 - 102628
Published: Dec. 15, 2022
The
activation
of
nitrogen
and
phosphorus
for
food
production
has
caused
the
transgression
safe
operating
space
Earth
system.
However,
countries
differ
in
use
their
fair
share
global
nutrient
activation,
causing
a
disparity
that
severe
implications
environment,
land
degradation
security.
Both
impact
on
system
processes
as
well
productivity
gains
losses
consequent
socio-economic
impacts
depend
past
use.
Therefore,
this
study,
we
examined
how
relation
to
countries'
shares
evolved
globally.
first
transgressions
planetary
boundaries
occurred
1970
1964
phosphorus,
respectively.
Since
then,
increased
160%
200%,
Further,
notable
differences
were
observed
between
countries,
which
high-income
regions
such
western
Europe
North
America
had
highest
cumulative
sub-Saharan
Africa
Oceania
greatest
deficit
relative
shares.
main
driver
was
economic
growth
rather
than
population
or
relatively
recent
fertiliser
subsidies.
Although
fertilisers
decreased
areas
with
previous
high
use,
usage
will
slow
down
effects
reductions
ecosystem
recovery
maintain
legacy
inequality.
Consequently,
addition
recycling
accumulated
nutrients
below
should
be
explored
economically
enabled
order
secure
functioning
while
eradicating
hunger.
