Science Advances,
Journal Year:
2023,
Volume and Issue:
9(2)
Published: Jan. 13, 2023
Microcystis,
a
common
harmful
algal
bloom
(HAB)
taxon,
threatens
water
supplies
and
human
health,
yet
species
delimitation
is
contentious
in
this
leading
to
challenges
research
management
of
threat.
Historical
morphology-based
classifications
recognize
multiple
morphospecies,
most
with
variable
diverse
ecologies,
while
DNA
sequence-based
indicate
single
ecotypes.
To
better
delimit
Microcystis
species,
we
conducted
pangenome
analysis
122
genomes.
Core-
non-core
gene
phylogenetic
analyses
placed
113
genomes
into
23
monophyletic
clusters
containing
at
least
two
Overall,
genome-related
indices
revealed
that
contains
16
putative
genospecies.
Fifteen
genospecies
included
one
aeruginosa
10
or
more
morphospecies.
This
classification
system
will
enable
consistent
taxonomic
identification
thereby
aid
resolving
some
the
complexities
controversies
have
long
characterized
eco-evolutionary
important
HAB
taxon.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: March 26, 2024
Abstract
The
brief
history
of
monitoring
nutrient
levels
in
Chinese
lake
waters
limits
our
understanding
the
causes
and
long-term
trends
their
eutrophication
constrains
effective
management.
We
therefore
synthesize
data
from
lakes
China
to
reveal
historical
changes
project
future
2100
using
models.
Here
we
show
that
average
concentrations
nitrogen
phosphorus
sediments
have
increased
by
267%
202%,
respectively
since
1850.
In
model
projections,
2030–2100,
studied
may
decrease,
for
example,
87%
southern
districts
19%
northern
districts.
However,
will
continue
increase
an
25%
Eastern
Plain,
Yunnan–Guizhou
Plateau,
Xinjiang.
Based
on
this
differentiation,
suggest
management
should
be
carried
out
at
district
level
help
develop
rational
sustainable
environmental
strategies.
Environmental Microbiology Reports,
Journal Year:
2022,
Volume and Issue:
15(1), P. 3 - 12
Published: Sept. 12, 2022
Billions
of
years
ago,
the
Earth's
waters
were
dominated
by
cyanobacteria.
These
microbes
amassed
to
such
formidable
numbers,
they
ushered
in
a
new
era-starting
with
Great
Oxidation
Event-fuelled
oxygenic
photosynthesis.
Throughout
following
eon,
cyanobacteria
ceded
portions
their
global
aerobic
power
photoautotrophs
rise
eukaryotes
(i.e.
algae
and
higher
plants),
which
co-existed
aquatic
ecosystems.
Yet
while
cyanobacteria's
ecological
success
story
is
one
most
notorious
within
our
planet's
biogeochemical
history,
scientists
this
day
still
seek
unlock
secrets
triumph.
Now,
Anthropocene
has
era
fuelled
excessive
nutrient
inputs
greenhouse
gas
emissions,
are
again
reshaping
biomes.
In
response,
we
experiencing
an
increase
cyanobacterial
bloom
distribution,
duration,
frequency,
leading
unbalanced,
many
instances
degraded,
A
critical
component
resurgence
freshwater-marine
continuum:
serves
transport
blooms,
toxins
produce,
on
premise
that
"water
flows
downhill".
Here,
identify
drivers
contributing
comeback
discuss
future
implications
context
environmental
human
health
along
continuum.
This
Minireview
addresses
overlooked
problem
freshwater
marine
continuum
effects
nutrients
toxic
blooms
moving
these
waters.
Marine
research
have
historically
been
conducted
isolation
independently
another.
Yet,
approach
fails
account
for
interchangeable
transit
biology
through
between
systems,
phenomenon
becoming
major
around
globe.
highlights
what
know
challenges
lie
ahead.
Limnology and Oceanography Letters,
Journal Year:
2022,
Volume and Issue:
8(2), P. 229 - 246
Published: Dec. 8, 2022
Abstract
The
worldwide
proliferation
of
harmful
algal
blooms
(HABs)
both
in
freshwater
and
marine
ecosystems
make
understanding
predicting
their
occurrence
urgent.
Trait‐based
approaches,
where
the
focus
is
on
functional
traits,
have
been
successful
explaining
community
structure
dynamics
diverse
but
not
applied
extensively
to
HABs.
existing
trait
compilations
suggest
that
HAB
taxa
differ
from
non
key
traits
determine
responses
major
environmental
drivers.
Multi‐trait
comparisons
between
HAB‐forming
other
phytoplankton
taxa,
as
well
within
groups
characterize
interspecific
intraspecific
differences
will
help
better
define
ecological
niches
different
develop
trait‐based
mechanistic
models,
identify
conditions
would
likely
lead
Building
databases
using
them
statistical
models
increase
our
ability
predict
occurrence,
composition,
severity
under
changing
conditions,
including
anthropogenic
global
change.
Nature Water,
Journal Year:
2023,
Volume and Issue:
1(10), P. 844 - 854
Published: Oct. 12, 2023
Abstract
High
concentrations
of
cyanobacterial
toxins
such
as
microcystin
represent
a
global
challenge
to
water
quality
in
lakes,
threatening
health,
economies
and
ecosystem
stability.
Lakes
are
sentinels
climate
change
but
how
warming
will
affect
is
still
unclear.
Here
we
examine
impacts
the
probability
exceeding
thresholds
across
2,804
lakes
United
States
show
future
alter
these
probabilities.
We
find
that
higher
temperatures
consistently
increase
likelihood
occurrence
above
highest
for
between
20
25
°C.
Regions
with
promote
shift
latitudes
coming
decades,
leading
relative
changes
exceedance
probabilities
more
than
50%
many
basins
States.
nitrogen
amplify
impact
rising
temperatures,
calling
increased
awareness
substantial
hazard
ecosystems
human
health
under
warming.
Harmful Algae,
Journal Year:
2023,
Volume and Issue:
127, P. 102466 - 102466
Published: June 2, 2023
Cyanobacteria
harmful
algal
blooms
produce
many
toxic
secondary
metabolites
called
cyanotoxins.
The
most
studied
group
of
cyanotoxins
are
microcystins
(MC),
with
over
300
congeners
reported.
MC-LR
is
the
congener
because
its
abundance
and
toxicity.
Recent
toxicology
studies
suggest
that
more
hydrophobic
MC
such
as
MC-LA,
MC-LF,
MC-LW
may
be
less
abundant
but
up
to
seven
times
than
MC-LR,
whereas,
MC-RR's
toxicity
only
one-fifth
MC-LR.
Hence,
understanding
environmental
stressors
change
profile
critical
assessing
negative
impact
on
human
health.
A
two-year
field
experimental
study
investigated
seasonal
spatial
changes
profiles
in
western
basin
Lake
Erie.
Both
showed
nitrogen
enrichment
favored
production
nitrogen-rich
MC-RR
(C49H75N13O12).
depletion
low-nitrogen
MC-LA
(C46H67N7O12).
(a
medium
N
level,
C49H75N10O12)
accounted
for
∼30%
50%
total
concentration
was
stable
across
concentrations.
Using
relative
concentrations
each
congener,
both
LC-MS/MS
ELISA
overestimated
early
bloom
(July)
underestimated
it
late
(September).
On
24
July
2019,
highly
MC-LF
were
detected
at
nearshore
stations
exceeding
drinking
water
standards.
This
demonstrated
toxic,
high
dominated
under
nitrogen-replete
conditions
season,
whereas
nitrogen-limited
later
season.
