Journal of Plankton Research,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 16, 2024
Abstract
Blooms
of
toxigenic
cyanobacteria
pose
a
mounting
risk
to
aquatic
ecosystems.
Relative
abiotic
drivers
success,
biotic
processes
have
received
less
attention.
Mixotrophic
nanoflagellates
that
combine
heterotrophic
ingestion
particulate
prey
with
photoautotrophy
are
among
the
eukaryotes
can
resist
cyanotoxins.
We
used
laboratory
experiments
in
culture
integrate
top-down
(herbivory)
and
bottom-up
(nitrogen
phosphorus
limitation)
controls
on
growth
production
microcystin-LR,
including
biodegradation
products,
Microcystis
by
Ochromonas
(mixotroph)
Spumella
(heterotroph).
A
notable
reduction
rate
toxic
was
evident
co-culture
either
or
under
P-limitation.
Under
P-limitation,
also
led
concentration
microcystin-LR
(MC-LR
an
increase
products.
Grazing
rates
up
31
50
cell−1
day−1
were
recorded
for
Spumella,
respectively.
The
highest
grazing
observed
N-limitation.
Hence,
it
is
likely
herbivore
N-limitation
competitor
nutrients
Collectively,
these
results
suggest
role
eukaryotic
decreasing
biomass
toxicity
associated
blooms
vary
nutrient
availability.
Harmful Algae,
Journal Year:
2025,
Volume and Issue:
143, P. 102809 - 102809
Published: Feb. 7, 2025
Though
freshwater
harmful
algal
blooms
have
been
described
and
studied
for
decades,
several
important
dynamics
remain
uncertain,
including
the
relationships
among
nutrient
concentrations,
phytoplankton
growth,
cyanotoxin
production.
To
identify
when
where
nutrients
limit
phytoplankton,
cyanobacteria,
cyanotoxins,
we
conducted
in
situ
bioassay
studies.
We
added
nitrogen
(N),
phosphorus
(P),
or
N
+
P
across
various
seasons
water
collected
from
three
locations
Utah
Lake,
one
of
largest
lakes
western
U.S.
This
shallow,
hypereutrophic
lake
provides
a
powerful
testbed
quantifying
nutrient-growth-toxin
interactions.
assessed
range
parameters
over
time,
photopigment
abundance
(cell
counts),
concentrations.
Despite
high
background
concentrations
water,
composition
were
strongly
affected
by
addition.
Phosphorus
limitation
was
more
common
spring,
with
becoming
fall.
Nutrient
additions
positively
associated
cyanobacteria
(Microcystis,
Aphanocapsa,
Dolichospermum,
Merismopedia,
Aphanizomenon
spp.),
eukaryotes
(Aulacoseira,
Desmodesmus
two
taxonomical
categories
(i.e.,
unicellular
colonial
green
algae).
When
detected,
anatoxin-a
negatively
Microcystis
spp.
However,
overall
not
cyanobacterial
cell
density
but
varied
seasonally.
These
findings
highlight
importance
considering
seasonal
availability
provide
insights
into
specific
targets,
species,
cyanotoxins
that
play
significant
role
health
management
similar
eutrophic
environments
around
world.
Biology,
Journal Year:
2025,
Volume and Issue:
14(3), P. 246 - 246
Published: Feb. 28, 2025
Aquatic
macrophytes
and
algae
constitute
essential
components
of
aquatic
ecosystems,
fulfilling
diverse
critical
roles
in
sustaining
ecological
integrity
equilibrium
[...]
Toxins,
Journal Year:
2025,
Volume and Issue:
17(3), P. 126 - 126
Published: March 7, 2025
Cyanobacterial
harmful
algal
blooms
(cyanoHABs)
are
a
natural
phenomenon
produced
mainly
by
the
interaction
between
and
anthropogenic
events.
CyanoHABs
characterized
production
of
cyanotoxins
that
can
have
effects
on
different
species
within
food
web
even
affect
human
health.
Among
most
prevalent
toxin
groups
worldwide
microcystins
(MCs),
anatoxins
(ATXs),
cylindrospermopsins
(CYNs)
nodularins
(NODs),
which
as
toxins
with
hepatotoxic,
neurotoxic,
cytotoxic
effects.
This
review
summarizes
analyzes
research
influence
cyanoHABs,
main
toxin-producing
cyanobacteria
in
freshwater
marine
bodies,
highlighting
their
global
occurrence,
toxicology,
bioaccumulation
dynamics
vectors
web,
cases
acute
chronic
intoxications
humans.
is
useful
for
understanding
cyanoHABs’
ecosystem
impact
health,
how
implementation
surveillance
management
framework
could
generate
vital
information
stakeholders
to
establish
health
guidelines
risks
hazards
cyanoHABs
bioRxiv (Cold Spring Harbor Laboratory),
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 20, 2025
Abstract
Cyanobacterial
blooms
increasingly
threaten
vital
freshwater
ecosystems,
with
harmful
impacts
exacerbated
by
climate
change
and
eutrophication.
Despite
extensive
research
on
temperature
nutrient
effects,
our
predictive
capacity
remains
limited.
We
propose
that
this
limitation
stems
from
insufficient
understanding
of
how
biotic
interactions
modify
cyanobacterial
responses
to
abiotic
conditions.
Using
five
years
daily
monitoring
data
a
eutrophic
lake
state-space
reconstruction
modelling,
we
show
co-occurring
plankton
species
fundamentally
reshape
the
realised
niche
bloom-forming
cyanobacteria.
Biotic
shift
thresholds
up
13°C
phosphorus
requirements
over
20
μg/L—effects
substantial
enough
determine
whether
environmental
conditions
support
or
prevent
in
Microcystis
Dolichospermum
.
Grazing
inhibits
bloom
formation
across
taxa,
while
facilitation
other
phytoplankton
may
allow
at
unexpectedly
low
temperatures
phosphate
concentrations.
These
findings
address
fundamental
gap—how
shape
niches
natural
systems—while
offering
practical
insights
for
management.
By
integrating
into
programs
models,
can
improve
forecasting
accuracy
develop
targeted
interventions
complement
traditional
control
approaches.
parallel
recent
advances
ecology
suggesting
role
mediating
species’
change.
Knowledge and Management of Aquatic Ecosystems,
Journal Year:
2025,
Volume and Issue:
426, P. 8 - 8
Published: Jan. 1, 2025
The
frequent
occurrence
of
cyanobacterial
blooms
poses
severe
threats
to
the
global
environment
and
local
human
health.
Therefore,
it
is
vital
develop
effective
methods
control
blooms.
Phalaris
arundinacea
,
a
dominant
hygrophyte
in
Lake
Poyang
wetland,
decomposes
when
submerged
during
high-water-level
periods.
Through
indoor
cultivation
experiments,
we
examined
effects
crude
aqueous,
ethyl
acetate,
dichloromethane
petroleum
ether
extracts
P.
on
growth
typical
harmful
bloom-forming
cyanobacteria
(
Microcystis
aeruginosa
Dolichospermum
flos-aquae
).
results
revealed
that
aqueous
extract
significantly
inhibited
M.
D.
with
average
inhibition
rates
86.77
per
cent
80.08
cent,
respectively.
inhibitory
effect
generally
increased
time
dose,
maximum
99.15
for
97.27
.
obtained
reduced
cell
density
chlorophyll
concentration
Among
extracts,
had
strongest
effect.
Generally,
these
three
organic
solvent
peaked
Day
8
or
12
experiment.
confirmed
Poyang,
has
significant
potential
controlling
through
release
allelochemicals
likely
plays
an
important
role
this
process
summer.
study
offers
novel
insights
materials
prevention
management
future.
