Limnology and Oceanography,
Journal Year:
2023,
Volume and Issue:
68(10), P. 2288 - 2304
Published: Aug. 24, 2023
Abstract
The
impacts
of
pulsed
nutrient
injections
or
extreme
runoff
events
on
marine
ecosystems
are
far
less
studied
than
those
associated
with
long‐term
eutrophication,
particularly
in
regard
to
mechanisms
regulating
the
response
plankton
community
structure.
Over
800
million
liters
nutrient‐rich
water
from
a
fertilizer
mine
were
discharged
over
2‐week
period
into
Tampa
Bay,
Florida,
2021,
providing
unique
opportunity
document
response.
A
3D‐coupled
hydrodynamic
biogeochemical
model
was
developed
investigate
this
and
understand
observed
succession
large,
short
diatom
bloom
followed
by
secondary
Karenia
brevis
that
lasted
through
summer.
reproduced
changes
concentration,
total
chlorophyll
,
K.
biomass
Bay.
With
faster
growth
rate
spring
temperature
close
optimal
window
growth,
diatoms
had
an
initial
competitive
advantage,
2/3
uptake
due
ammonium
1/3
nitrate.
However,
exhaustion
external
nutrients
led
rapid
decline
bloom,
particular
organic
nitrogen
sank
onto
bay
sediment.
Enhanced
sediment
release
during
weeks
following,
summer
remineralization
dissolved
provided
sufficient
regenerated
support
slow‐growing
could
capitalize
low
conditions.
Modeling
analysis
largely
confirmed
Margalef's
conceptual
r
K
‐selected
species
additional
insights
cycling
supporting
subsequent
harmful
algal
species.
Ecological Processes,
Journal Year:
2024,
Volume and Issue:
13(1)
Published: Feb. 18, 2024
Abstract
Background
Although
phytoplankton
are
important
primary
producers
in
food
webs,
they
relatively
less
studied
large
rivers
compared
to
other
types
of
systems.
To
fill
this
research
gap,
we
taxonomic
and
functional
composition
their
relationships
with
water
quality,
habitat,
climate,
land
use
across
30
river
sections
the
middle
lower
reaches
Yangtze
River
during
2017–2018.
Results
Major
observed
groups
were
cyanobacteria,
bacillariophyta,
chlorophyta.
Phytoplankton
total
abundance,
biomass,
species
richness
significantly
decreased
dry
season
wet
season,
differing
between
seasons.
differences
seasons
mainly
contributed
by
Oscillatoria
sp.,
Pseudanabaena
Melosira
granulata
.
The
dfferences
P
(including
Closterium
sp.),
Lo
Merismopedia
Peridinium
Ceratium
Gymnodinium
J
Pediastrum
Tetraedron
Crucigenia
Scenedesmus
Coelastrum
sp.).
variance
partitioning
showed
that
quality
(NO
3
-N,
suspended
solids,
turbidity)
habitat
(water
flow,
bank
channel
conditions)
critical
factors
shaping
patterns,
followed
climate
use.
Conclusions
indicated
there
was
significant
seasonal
variation
River,
primarily
driving
patterns.
Our
study
contributes
understanding
natural
anthropogenic
drive
successional
processes
River.
These
findings
have
implications
for
environmental
management
as
well
towards
ecological
restoration
rivers.
Frontiers in Marine Science,
Journal Year:
2025,
Volume and Issue:
11
Published: Jan. 9, 2025
Coastal
ecosystems
are
increasingly
experiencing
anthropogenic
pressures
such
as
climate
warming,
CO
2
increase,
metal
and
organic
pollution,
overfishing,
resource
extraction.
Some
resulting
stressors
more
direct
like
pollution
fisheries,
others
indirect
ocean
acidification,
yet
they
jointly
affect
marine
biota,
communities,
entire
ecosystems.
While
single-stressor
effects
have
been
widely
investigated,
the
interactive
of
multiple
on
less
researched.
In
this
study,
we
review
literature
their
in
coastal
environments
across
organisms.
We
classify
interactions
into
three
categories:
synergistic,
additive,
antagonistic.
found
phytoplankton
bivalves
to
be
most
studied
taxonomic
groups.
Climate
warming
is
identified
dominant
stressor
which,
combination,
with
other
eutrophication,
exacerbate
adverse
physiological
traits
growth
rate,
fitness,
basal
respiration,
size.
Phytoplankton
appears
sensitive
between
nutrient
pollution.
warm
nutrient-enriched
environments,
presence
metals
considerably
affects
uptake
nutrients,
increases
respiration
costs
toxin
production
phytoplankton.
For
bivalves,
low
pH
lethal
stressors.
The
combined
effect
heat
stress
acidification
leads
decreased
shell
size,
acid-base
regulation
capacity
bivalves.
However,
for
a
holistic
understanding
how
food
webs
will
evolve
ongoing
changes,
suggest
research
ecosystem-level
responses.
This
can
achieved
by
combining
in-situ
observations
from
controlled
(e.g.
mesocosm
experiments)
modelling
approaches.
Heliyon,
Journal Year:
2024,
Volume and Issue:
10(9), P. e30614 - e30614
Published: May 1, 2024
Microorganisms
play
an
important
role
in
maintaining
the
proper
functioning
of
river
ecosystems
and
are
promising
candidates
for
environmental
indicators.
They
also
highly
sensitive
to
changes.
It
is
necessary
have
basic
knowledge
about
them
order
know
ecological
status
ecosystem.
To
our
knowglege,
there
very
little
information
on
microorganisms
surface
water
Seine
River,
although
River
one
rivers
that
suffers
greatest
impact
from
humain
activities
world
due
a
weak
dilution
effect.
therefore
carry
out
microbial
analysis
assess
use
it
as
reference
compare
with
future
state
when,
instance,
new
disinfection
technologies
wastewater
implemented.To
this
end,
communities
were
analyzed,
taking
into
account
spatial
effect,
including
tributaries,
upstream
downstream
Paris
conurbation
temporal
aspect,
monitoring
over
4
seasons.
The
results
showed
microbiome
diverse
involved
variety
functions.
main
phyla
making
up
Proteobacteria,
Actinobacteriota,
Firmicutes,
Bacteroidota,
while
other
minor
Deinococcota,
Patescibacteria,
Gemmatimonadota,
Cyanobacteria,
Bdellovibrionota,
Acidobacteriota,
Campilobacterota,
Myxococcota,
Desulfobacterota.
Overall,
community
did
not
change
spatially
(with
exception
some
differences
between
downstream),
but
vary
seasonally.
factors
influencing
temperature,
nitrate
orthophosphate
concentrations.
predicted
functions
related
cell
metabolism,
particular
carbohydrates,
amino
acids,
lipids,
energy,
vitamins
cofactors,
mobility.
compositions
strong
balance
groups
degradation
recalcitrant
compounds.
