Limnology and Oceanography,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 15, 2024
Abstract
Dissolved
oxygen
(DO)
in
the
bottom
layer
is
essential
for
benthic
organisms,
and
its
temporal
variations
are
widely
concerned.
However,
previous
studies
have
primarily
focused
on
long‐term
of
DO,
leaving
high‐frequency
(HF)
dynamics
inadequately
understood.
This
study
addresses
this
gap
by
utilizing
two
seafloor
monitoring
systems
that
provide
3‐year‐long
HF
records
a
typical
temperate
shelf
sea,
Bohai
Sea,
China.
During
stratified
period
each
year,
DO
exhibits
notable
fluctuations
superimposed
seasonal
cycle.
These
signals
originate
from
tide‐induced
vertical
mixing,
showing
peaks
at
various
tidal
frequencies.
Notably,
significant
shallow‐water
observed
due
to
frequency
doubling
semi‐diurnal
diurnal
currents.
Moreover,
demonstrates
strongly
asymmetric
responses
mixing
time
scales.
To
be
specific,
increases
with
intensity
process
being
exceptionally
rapid
under
conditions
weak
mixing.
The
underlying
cause
asymmetry
markedly
stronger
gradient
near
seabed
sediment
demand.
A
process‐oriented
biological
model
successfully
reproduced
observational
features,
further
supporting
our
theoretical
inference.
findings
highlight
joint
role
demand
modulating
seas,
underscoring
their
significance
refined
prediction
future.
Journal of Environmental Engineering,
Journal Year:
2024,
Volume and Issue:
150(4)
Published: Feb. 9, 2024
Phytoplankton
plays
an
essential
role
in
the
biogeochemical
cycle
because
it
is
at
top
of
food
chain
and
a
source
oxygen.
Eutrophication
causes
coastal
areas
to
deteriorate
as
industrialization
accelerates,
leading
harmful
algal
blooms
(HABs),
severely
affecting
human
ecological
health.
The
frequency
extent
HAB
events
potentially
may
increase
due
climate
change.
outbreaks
have
led
substantial
losses
for
major
economies
globally,
therefore
emerged
critical
research
focus
environmental
sciences.
However,
lack
overview
diverse
factors
influencing
HABs
complicates
cause
identification
effective
countermeasure
development
occurrence,
thereby
impeding
formulation
targeted
strategies
prediction
mitigation.
Therefore,
this
review
summarizes
influential
areas,
including
water
quality
(nutrients,
salinity,
stratification,
biological
factors)
climatological
(temperature,
pH
pCO2,
irradiance
light).
Recent
work
with
several
algae
species
suggested
that
warmer
temperatures
combined
nutrient
variation,
stronger
ocean
acidification
growth
some
toxic
dinoflagellate
species.
Although
effects
vary
different
locations,
intensification
anthropogenic
activities
change
likely
will
frequency,
outbreak
scale,
severity
most
HABs.
Because
predicting
crucial
understanding
synergy
their
minimizing
decision
makers
stakeholders,
we
reviewed
models
HABs,
process-based
models,
traditional
statistical-empirical
data-driven
machine
learning
models.
Predicting
becomes
more
challenging
spatial
distribution
influenced
by
future
patterns.
This
paper
presents
comprehensive
various
impacting
serving
valuable
resource
researchers
design
mitigation
strategies.
In
a
constantly
changing
environment
brought
about
by
the
climate
crisis
and
escalated
anthropogenic
perturbations
driven
growing
population,
harmful
algal
bloom
dynamics
their
impacts
are
expected
to
shift,
necessitating
adaptive
management
strategies
comprehensive
research
efforts.
Similar
primary
productivity,
HABs
have
been
thought
be
primarily
major
nutrients
such
as
N,
P,
Si.
However,
recent
investigations
on
role
importance
of
micronutrients
limiting
factors
in
aquatic
environments
highlighted.
This
paper
provides
review
metal
phytoplankton
interactions,
with
specific
emphasis
pertinent
information
influence
trace
growth,
toxin
production,
other
underlying
mechanisms
related
HABs.
Low
near-depleted
levels
essential
including
Fe,
Cu,
Zn,
Se,
Mn,
Co,
Mo,
negatively
impact
cell
growth
proliferation
various
marine
freshwater
HAB
species.
evidence
shows
that
at
elevated
levels,
these
elements
along
non-essential
ones,
could
still
cause
toxic
effects
certain
species
manifested
decreased
photosynthetic
activities,
oxidative
stress,
ultrastructure
damage,
cyst
formation.
Interestingly,
while
metals
mostly
result
increased
Co
(i.e.,
yessotoxins,
gymnodimine,
palytoxins)
Mn
isodomoic
acid,
okadaic
diol
esters)
enrichments
revealed
otherwise.
addition
releasing
dissolved
organic
matter
(DOM)
carbon
(DOC)
humic
substances
was
observed
an
adaptation
strategy,
since
compounds
proven
chelate
water
column,
thereby
reducing
metal-induced
toxicity.
Whilst
current
center
free
toxicity
Cu
account
how
contribute
metabolic
processes
under
conditions
reflective
in-situ
scenarios
HAB-prone
areas,
would
yield
new
perspectives
roles
With
demands
global
population
for
food
security
sustainability,
substantial
pressure
is
exerted
agriculture
aquaculture
sector,
highlighting
need
effective
communication
regarding
interactions
macro-
improve
existing
policies
practices.
Journal of Marine Science and Engineering,
Journal Year:
2025,
Volume and Issue:
13(5), P. 835 - 835
Published: April 23, 2025
Mariculture
is
currently
experiencing
rapid
growth
in
response
to
the
rising
global
food
demand,
while
simultaneously
posing
significant
challenges
environmental
issues,
such
as
pollution
stress
and
ecological
degradation.
To
achieve
a
balance
between
ecosystem
maintenance
seafood
supply,
marine
ranching
has
flourished
sustainable
approach
through
implementation
of
artificial
reef
construction,
stock
enhancement,
strategic
releasing.
However,
few
studies
have
evaluated
impacts
comparison
situ
survey
data
across
geographical
areas.
Phytoplankton
are
vital
organisms
ecosystems
that
function
essential
indicators
seawater
quality
biological
diversity,
reflecting
health
sustainability.
In
this
study,
we
investigated
species
community
structure,
co-occurrence
network
phytoplankton
based
on
175
samples
collected
from
75
sites
encompassing
all
26
areas,
along
with
their
corresponding
surrounding
areas
Yantai’s
coastal
sea.
A
total
112
were
identified
three
phyla
diatoms,
dinoflagellates,
chrysophytes;
among
them,
diatoms
dominated
notably
high
proportion
98.83%.
Their
diversity
structure
exhibited
variations
different
seasons
geographic
locations.
Moreover,
no
preference
was
observed
Nevertheless,
analysis
demonstrated
lower
values
for
average
degree,
clustering
coefficient,
path
length
ranching,
indicating
aquaculture
activities
reduced
connectivity
potential
interactions.
Additionally,
it
showed
stability
indicated
by
remaining
nodes
natural
indices,
regardless
removed.
These
findings
illustrate
processes
can
mitigate
losses
maintaining
they
still
alter
association
reduce
overall
stability.
This
research
recommends
scientifically
informed
expansion
necessitates
robust
monitoring
datasets
systematic
validation
ensure
holistic
