Water Environment Research,
Journal Year:
2025,
Volume and Issue:
97(3)
Published: March 1, 2025
Abstract
Harmful
algal
blooms
(HABs),
driven
by
eutrophication,
are
a
growing
ecological
threat,
compromising
water
quality
and
ecosystem
health
through
the
release
of
toxic
microcystins
(MCs).
These
toxins
pose
significant
risks
to
both
aquatic
life
human
health.
Among
emerging
solutions,
UV‐C
technology
has
gained
attention
for
its
efficiency
in
inhibiting
growth
degrading
MCs,
offering
cost‐effective
environmentally
friendly
approach
with
minimal
secondary
pollution.
However,
existing
studies
often
overlook
key
aspects,
including
variability
algae
sensitivity
wavelengths,
stability
treatment
across
diverse
conditions,
toxicity
degradation
byproducts.
This
review
highlights
mechanisms
underlying
UV‐C‐based
removal,
explores
potential
limitation,
such
as
resistance,
compares
efficacy
other
remediation
methods.
Notably,
lack
comprehensive
research
on
wavelength‐specific
real‐world
application
represents
knowledge
gap.
Further
investigation
into
these
areas
is
essential
optimize
mitigating
HABs
improving
safety
eutrophic
environments.
Practitioner
Points
The
choice
UV
band
should
be
adjusted
species.
system,
limited
applications
natural
bodies,
demonstrates
instability.
Combining
technologies
substantially
enhances
control.
Future
emphasize
strategies
prevent
rapid
(MCs)
from
this
system
due
cell
lysis
extracellular
within
short
time
frame.
Frontiers in Microbiology,
Journal Year:
2025,
Volume and Issue:
16
Published: March 28, 2025
A
fundamental
goal
of
reservoir
ecosystem
management
is
to
understand
bacterial
biogeographic
patterns
and
the
mechanisms
shaping
them
at
a
regional
scale.
However,
little
known
about
how
eutrophication,
major
water
quality
challenge
in
reservoirs,
influences
sediment
subtropical
regions.
In
this
study,
communities
were
sampled
from
21
reservoirs
Hanjiang
river
basin,
southern
China,
spanning
trophic
states
oligotrophic
eutrophic.
Our
findings
demonstrated
that
eutrophication-driven
changes
total
carbon
(TC)
significantly
shaped
communities,
weakening
"distance-decay"
relationships
typically
link
community
similarity
geographical
distance.
TC
content
exceeding
threshold
13.2
g·kg-1
resulted
substantial
shifts
structure.
Specifically,
high
levels
promoted
dominance
copiotrophic
bacteria
such
as
Syntrophales
(Deltaproteobacteria),
Clostridiaceae
(Firmicutes),
VadinHA17
(Bacteroidetes),
while
taxa
like
Anaerolineaceae
(Chloroflexi)
Nitrospirota
prevalent
low
sediments.
Additionally,
higher
was
associated
with
increased
heterogeneity
composition.
Reservoirs
elevated
exhibited
more
complex
interaction
networks,
characterized
by
stronger
niche
segregation
competition
compared
networks.
Overall,
these
underscore
pivotal
role
biogeography
They
provide
valuable
insights
for
predicting
responses
eutrophication
offer
guidance
mitigating
impacts
anthropogenic
activities
on
freshwater
ecosystems.
Research Square (Research Square),
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 1, 2025
Abstract
Nutrient
enrichment
has
long
been
recognized
as
a
major
threat
to
freshwater
ecosystems.
Mounting
evidence
suggests
that
nutrient
leads
decline
in
the
biodiversity
and
functional
homogenization
of
species,
manifested
alpha
or
beta
diversity
indices.
While
several
studies
have
investigated
effects
on
macroinvertebrates,
comprehensive
analysis
taxonomic,
functional,
phylogenetic
at
levels
remains
relatively
scarce.
Therefore,
data
macroinvertebrate
assemblage
structure
environmental
factors
were
collected
northern
Chinese
rivers
elucidate
response
their
multidimensional
enrichment.
The
results
revealed
most
significant
factor,
an
increase
total
phosphorus
not
only
reduced
evenness
dispersion
within
community
level,
leading
benthic
but
also
enhanced
nested
components
turnover
component
level.
This
shift
resulted
loss
endemic
which
stabilized
structure.
However,
this
community,
composed
universal
markedly
reduces
ecosystem's
resistance
changes.
Additionally,
by
constructing
structural
equation
model,
effect
was
found
be
more
pronounced
than
taxonomic
diversity.
Collectively,
these
findings
provide
valuable
insights
for
integrated
research
conservation
nutrient-enriched
river
Food Chemistry X,
Journal Year:
2025,
Volume and Issue:
unknown, P. 102442 - 102442
Published: April 1, 2025
This
study
was
to
uncover
the
astaxanthin
accumulation
mechanism
of
Microcystis
flos-aquae
stressed
by
NaCl
and
KCl
select
optimal
condition
for
production.
Both
stresses
showed
inhibiting
effects
on
M.
growth
reducing
photosynthetic
abilities
causing
reactive
oxygen
species
accumulation.
With
raising
two
salt
concentrations,
content
yield
gradually
increased,
highest
under
300
mM
each
salt,
which
should
result
from
up-regulation
6
related
genes
promoting
precursor
(β-carotene
zeaxanthin)
transformation.
stress
more
effective
improving
than
stress,
strongly
with
concentration
content.
Compared
other
potential
suitable
conditions
(35°C
purple
light),
also
exhibited
maximum
effect
Therefore,
is
first
identified
synthesize
astaxanthin,
favorable
compound
Diversity and Distributions,
Journal Year:
2024,
Volume and Issue:
30(5)
Published: March 15, 2024
Abstract
Aim
Understanding
the
distance–decay
relationship
(DDR)
has
been
considered
important
because
it
reflects
a
combination
of
several
ecological
processes
such
as
dispersal
limitation
and
environmental
sorting.
However,
effects
human
disturbances
on
DDR
are
poorly
known,
especially
in
freshwater
lakes.
This
study
is
aimed
to
examine
how
anthropogenic
eutrophication
modified
relationships
between
three
facets
(taxonomic,
functional
phylogenetic)
macroinvertebrate
beta
diversity
geographic
distances
across
30
Location
The
Yangtze
River
floodplain,
China.
Methods
We
used
Mantel
tests
multiple
assemblage
dissimilarities
(overall
diversity,
replacement
richness
difference
components)
distances.
Distance‐based
redundancy
analysis
(dbRDA)
associated
variation
partitioning
procedures
were
applied
explore
relative
contributions
spatial
factors
diversity.
Results
found
that
none
was
related
distance,
but
all
significantly
mainly
mirroring
eutrophication‐related
variables.
Based
approach,
assemblages
examined
almost
exclusively
structured
by
with
eutrophication,
while
variables
had
negligible
effect.
Nevertheless,
different
did
not
decrease
(i.e.,
no
homogenization
trend)
lake
groups
showing
highest
levels,
implying
complex
influences
driving
or
differentiation
compositional
dissimilarity.
Main
Conclusions
Our
findings
suggested
high
degrees
acted
an
filter
modify
relationships,
possibly
via
decreasing
importance
shaping
studied
Given
sensitivity
patterns
we
this
study,
recommend
role
should
be
incorporated
into
research
general
like
DDR.
