Abstract.
Dense
blooms
of
filamentous
diazotrophic
cyanobacteria
are
formed
every
summer
in
the
Baltic
Sea.
These
autotrophic
organisms
may
bypass
nitrogen
limitation
by
performing
fixation,
which
also
governs
surrounding
releasing
bioavailable
nitrogen.
The
magnitude
fixation
is
important
to
estimate
from
a
management
perspective
since
this
might
counteract
eutrophication
reduction
measures.
Here,
life
cycle
model
has
been
implemented
for
first
time
high-resolution
3D
coupled
physical
and
biogeochemical
Sea
spanning
years
1850–2008.
explicit
consideration
dynamics
transitions
significantly
improves
representation
cyanobacterial
phenological
patterns.
Compared
earlier
3D-modelling
efforts,
rapid
increase
decrease
well
captured
our
developed
now
concert
with
observations.
current
improvement
timing
had
large
effect
on
estimated
load
agreement
situ
measurements.
By
four
phosphorus
sensitivity
runs
we
demonstrate
importance
both
organic
inorganic
availability
historical
biomass
estimates.
used
combination
can
be
continuously
internal
loads
via
ecosystem
management,
extra
future
ocean
changed
conditions
cyanobacteria.
Frontiers in Marine Science,
Год журнала:
2020,
Номер
7
Опубликована: Авг. 17, 2020
Coastal
eutrophication
caused
by
anthropogenic
nutrient
inputs
is
one
of
the
greatest
threats
to
health
coastal
estuarine
and
marine
ecosystems
worldwide.
To
better
understand
manage
this
threat,
we
compared
six
contrasting
that
are
subjected
a
range
riverine
freshwater
(buoyancy)
nutrients
address
(i)
impacts
on
ecosystem
services;
(ii)
how
traits
minimize
or
amplify
these
impacts;
(iii)
synergies
among
pressures
(nutrient
enrichment,
over
fishing,
development,
climate-driven
in
particular);
(iv)
management
ecosystems.
Globally,
~
24%
N
released
watersheds
estimated
reach
Our
comparative
assessment
revealed
terms
spatial
extent
habitat
degradation,
Chesapeake
Bay
ranks
number
followed
rank
order
northern
Gulf
Mexico,
Baltic
Sea,
Great
Barrier
Reef,
East
China
Sea
Adriatic
Sea;
increases
loading
are,
will
continue
be,
exacerbated
with
other
including
development
sea
surface
temperature,
acidification
rainfall;
when
defined
quantitative
ranges
primary
production,
trophic
status
not
useful
for
relating
impacts.
While
managed
reductions
point
source
from
sewage
treatment
plants
increasingly
successful,
controlling
diffuse
sources
remains
challenging
problem.
Thus,
it
likely
severity
increase
absence
effectively
enforced,
ecosystem-based
both
nitrogen
phosphorus.
This
requires
sustained,
integrated
research
monitoring,
as
well
repeated
assessments
These
must
be
informed
guided
ongoing
collaborations
scientists,
politicians,
managers
public.
Cambridge Prisms Coastal Futures,
Год журнала:
2023,
Номер
1
Опубликована: Янв. 1, 2023
Abstract
Coastal
eutrophication
and
hypoxia
remain
a
persistent
environmental
crisis
despite
the
great
efforts
to
reduce
nutrient
loading
mitigate
associated
damages.
Symptoms
of
this
have
appeared
spread
rapidly,
reaching
developing
countries
in
Asia
with
emergences
Southern
America
Africa.
The
pace
changes
underlying
drivers
not
so
clear.
To
address
gap,
we
review
up-to-date
status
mechanisms
global
coastal
oceans,
upon
which
examine
trajectories
over
40
years
or
longer
six
model
systems
varying
socio-economic
development
statuses
different
levels
histories
eutrophication.
Although
these
share
common
features
eutrophication,
site-specific
characteristics
are
also
substantial,
depending
on
regional
setting
level
social-economic
along
policy
implementation
management.
Nevertheless,
ecosystem
recovery
generally
needs
greater
reduction
pressures
compared
that
initiated
degradation
becomes
less
feasible
achieve
past
norms
time
anthropogenic
ecosystems.
While
qualitative
causality
between
consequences
is
well
established,
quantitative
attribution
remains
difficult
especially
when
consider
social
economic
because
ecosystems
subject
multiple
influences
cause–effect
relationship
often
non-linear.
Such
relationships
further
complicated
by
climate
been
accelerating
few
decades.
knowledge
gaps
limit
our
mechanistic
understanding
human-coastal
ocean
nexus
identified,
essential
for
science-based
making.
Recognizing
lessons
from
management
practices,
advocate
better,
more
efficient
indexing
system
an
advanced
earth
modeling
framework
optimal
modules
human
dimensions
facilitate
evaluation
effective
restoration
actions.
Journal of Operational Oceanography,
Год журнала:
2022,
Номер
15(sup1), С. 1 - 220
Опубликована: Авг. 31, 2022
Statement
of
main
outcome:
This
section
presents
a
satellite-based
map
potential
eutrophic
and
oligotrophic
areas
in
the
European
Seas
for
year
2020,
together
with
time
series
eutrophication
past
23
years
(1998-2020)
averaged
over
Exclusive
Economic
Zones
(EEZs)
each
country.The
were
generated
on
basis
comparison
per-pixel
chlorophyll-a
data
from
remote
sensing
reporting
corresponding
climatological
90th
percentile
(P90)
established
20-year
baseline
(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016)(2017).The
results
showed
few
scattered
areas,
while
extensive
coastal
shelf
waters
indicate
status.The
distributions
point
to
localities
that
should
be
watch
determine
situ
nutrient
levels
whether
trend
is
sustained
into
future.The
at
EEZ
level
low
percentages
across
area
some
remarkable
high
events
occurring
first
decade
study
period,
followed
by
an
overall
reduction
2013
onwards.Furthermore,
several
countries,
indicator
was
often
nil
or
never
exceeded
1%
area.Results
are
then
compared
those
Sustainable
Development
Goal
(SDG,
set
United
Nations
General
Assembly)
14
global
satellite-derived
(target
14.1).
Earth System Dynamics,
Год журнала:
2022,
Номер
13(1), С. 633 - 685
Опубликована: Март 31, 2022
Abstract.
Location,
specific
topography,
and
hydrographic
setting
together
with
climate
change
strong
anthropogenic
pressure
are
the
main
factors
shaping
biogeochemical
functioning
thus
also
ecological
status
of
Baltic
Sea.
The
recent
decades
have
brought
significant
changes
in
First,
rising
nutrient
loads
from
land
second
half
20th
century
led
to
eutrophication
spreading
hypoxic
anoxic
areas,
for
which
permanent
stratification
water
column
limited
ventilation
deep-water
layers
made
favourable
conditions.
Since
1980s
Sea
been
continuously
decreasing.
This,
however,
has
so
far
not
resulted
improvements
oxygen
availability
deep
regions,
revealed
a
slow
response
time
system
reduction
land-derived
loads.
Responsible
that
is
low
burial
efficiency
phosphorus
at
conditions
its
remobilization
sediments
when
oxic
anoxic.
This
results
stoichiometric
excess
available
organic-matter
production,
promotes
growth
N2-fixing
cyanobacteria
turn
supports
eutrophication.
assessment
reviews
published
knowledge
on
In
content,
paper
covers
aspects
related
carbon,
nitrogen,
(C,
N,
P)
external
loads,
their
transformations
coastal
zone,
production
(eutrophication)
remineralization
(oxygen
availability),
role
turnover
C,
P.
addition
that,
this
focuses
marine
CO2
system,
structure
microbial
community,
contaminants
processes.
comprehensive
allowed
identifying
gaps
future
research
needs
field
biogeochemistry
Limnology and Oceanography Letters,
Год журнала:
2021,
Номер
7(1), С. 1 - 10
Опубликована: Окт. 29, 2021
Although
N2
fixation
is
a
major
component
of
the
global
N
cycle
and
has
been
extensively
studied
in
open-ocean
terrestrial
ecosystems,
rates
ecological
dynamics
remain
virtually
unknown
for
inland
coastal
aquatic
ecosystems
(lakes,
wetlands,
rivers,
streams,
estuaries)
that
connect
marine
biomes.
This
due
to
diversity
these
habitats,
as
well
traditional
paradigm
were
low
nonexistent,
therefore
not
important,
ecosystems.
We
identify
three
research
themes
advance
understanding
fixation:
1)
biological
diazotrophs
variability
rates,
2)
stoichiometry
fixation,
3)
upscaling
from
genes
Coordinating
across
areas
will
limnology
oceanography
by
fully
integrating
into
local
scales.
The Science of The Total Environment,
Год журнала:
2024,
Номер
915, С. 169885 - 169885
Опубликована: Янв. 6, 2024
Warmer
temperatures
can
significantly
increase
the
intensity
of
cyanobacterial
harmful
algal
blooms
(CHABs)
in
eutrophic
freshwater
ecosystems.
However,
few
studies
have
examined
effects
CO
Harmful Algae,
Год журнала:
2022,
Номер
116, С. 102215 - 102215
Опубликована: Март 11, 2022
Cyanobacteria
play
a
significant
role
in
ecosystem
functioning
as
photosynthetic
and
CO2
fixing
microorganisms.
Whether
to
what
extent
cyanophages
alter
these
carbon
energy
cycles
their
cyanobacterial
hosts
is
still
poorly
understood.
In
this
study,
we
investigated
changes
activity
(PSII),
expression
of
genes
associated
with
the
light
phase
photosynthesis
(psbA,
petA,
ndhK)
metabolism
(rbcL,
zwf)
well
intracellular
ATP
NADHP
concentrations
freshwater
bloom-forming
filamentous
cyanobacterium
Aphanizomenon
flos-aquae
infected
by
cyanophage
vB_AphaS-CL131.
We
found
that
PSII
level
rbcL
genes,
indicating
potential
for
fixation,
had
decreased
response
adsorption
DNA
injection.
During
period
viral
replication
assembly,
performance
gene
remained
at
did
not
change
significantly,
lack
transcriptional
shutdown
cyanophage.
Combined,
observations
suggest
although
there
little
no
interference
between
replication,
host
transcription
cellular
metabolism,
A.
underwent
physiological
state-shift
toward
lower
efficiency
cycling.
This
further
cascading
effect
co-occurring
non-infected
members
microbial
community.
Biogeosciences,
Год журнала:
2021,
Номер
18(5), С. 1857 - 1871
Опубликована: Март 18, 2021
Abstract.
Coastal
lagoons
are
important
sites
for
nitrogen
(N)
removal
via
sediment
burial
and
denitrification.
Blooms
of
heterocystous
cyanobacteria
may
diminish
N
retention
as
dinitrogen
(N2)
fixation
offsets
atmospheric
losses
We
measured
N2
in
the
Curonian
Lagoon,
Europe's
largest
coastal
lagoon,
to
better
understand
factors
controlling
context
seasonal
changes
phytoplankton
community
composition
external
inputs.
Temporal
patterns
were
primarily
determined
by
abundance
cyanobacteria,
mainly
Aphanizomenon
flos-aquae,
which
became
abundant
after
decline
riverine
nitrate
inputs
associated
with
snowmelt.
Heterocystous
dominated
summer
resulting
strong
correlations
between
chlorophyll
a
(Chl
a)
fixation.
used
regression
models
relating
Chl
a,
along
remote-sensing-based
estimates
derive
lagoon-scale
pelagic
was
found
be
significant
component
lagoon's
budget
based
on
comparisons
previously
derived
fluxes
inputs,
sediment–water
exchange,
To
our
knowledge,
this
is
first
study
ecosystem-scale
combining
remote
sensing
empirical
rates
a.
Scientific Reports,
Год журнала:
2022,
Номер
12(1)
Опубликована: Июнь 27, 2022
Abstract
In
late
summer,
massive
blooms
and
surface
scums
of
cyanobacteria
emerge
regularly
in
the
Baltic
Sea.
The
bacteria
can
produce
toxins
add
bioavailable
nitrogen
fixed
from
atmospheric
to
an
already
over-fertilized
system.
This
counteracts
management
efforts
targeted
at
improving
water
quality.
Despite
their
critical
role,
controls
on
are
not
comprehensively
understood
yet.
limits
usability
models-based
bloom
forecasts
projections
into
our
warming
future.
Here
we
discussion
by
combining,
for
first
time,
satellite
estimates
with
output
a
high-resolution
general
ocean
circulation
model
in-situ
nutrient
observations.
We
retrace
origins
conditions
calculating
trajectories
respective
parcels
backwards
time.
attempt
identify
drivers
development,
find
that
originate
manifest
themselves
predominantly
offshore
where
more
nutrient-depleted
compared
coastal
environments.
Ecological Indicators,
Год журнала:
2023,
Номер
147, С. 109983 - 109983
Опубликована: Фев. 11, 2023
The
intensity
and
duration
of
heat
waves
are
expected
to
increase
this
century,
occurrences
considered
favorable
for
harmful,
bloom-forming
freshwater
cyanobacteria.
Dinitrogen
(N2)
fixation
is
a
major
component
nitrogen
cycling
in
systems,
yet
little
known
with
respect
how
diazotrophic
(N2
fixing)
cyanobacteria
respond
waves.
Here,
we
quantified
the
effects
elevated
temperature
fixed
N
enrichment
on
growth
N2
rates
Dolichospermum
isolates
from
differing
latitudes
cyanobacterial
communities
four
lakes
across
New
York
state,
USA,
during
summer
early
fall.
In
culture
experiments,
temperatures
≥
26℃
significantly
reduced
maximum
sub-polar
strains
Finland
relative
those
grown
at
20
−
25℃,
while
strain
isolated
subtropical
Australia
grew
faster
30℃
compared
cooler
temperatures.
All
strains,
however,
exhibited
lower
higher
(29
30℃)
(13-26℃).
During
ecosystem-based
experiments
comprised
Nostocales
other
cyanobacteria,
short-term
(3–4
day)
exposures
mimicking
(+3-6℃;
27-31℃)
and/or
(NH4+)
caused
significant
net
but
also
decline
rates.
Collectively,
results
indicate
that
loading
can
promote
communities,
they
suppress
diazotrophy,
which
generally
regarded
as
eutrophic
systems.
Such
reductions
would
or
intensify
limitation
primary
production
summer,
an
outcome
be
exacerbated
under
future
warming
scenarios.