Abstract
Natural
communities
are
exposed
to
multiple
environmental
stressors,
which
simultaneously
impact
the
population
and
trait
dynamics
of
species
embedded
within
these
communities.
Given
that
certain
traits,
such
as
body
size,
known
rapidly
respond
change,
given
they
can
strongly
influence
density
populations,
this
raises
question
whether
strength
eco‐phenotypic
feedback
loop
depends
on
environment,
stressful
environments
would
enhance
or
disrupt
causal
linkage.
We
use
two
competing
freshwater
ciliates—
Colpidium
striatum
Paramecium
aurelia
—and
expose
their
populations
a
full‐factorial
design
increasing
salinity
temperature
conditions
well
interspecific
competition.
found
salinity,
temperature,
competition
significantly
affected
cell
size
both
species.
Cell
influenced
dynamics;
however,
weakened
in
with
Our
study
highlights
importance
studying
different
comprising
abiotic
interactions.
Permafrost and Periglacial Processes,
Год журнала:
2024,
Номер
35(2), С. 109 - 124
Опубликована: Янв. 30, 2024
Abstract
Sandy
saline
soils
are
widely
distributed
and
commonly
experience
seasonal
or
long‐term
freezing,
yet
the
freezing
process
in
these
is
rarely
studied.
This
research
utilized
situ
X‐ray
computed
tomography
(CT)
to
visualize
pore‐scale
processes
sandy
under
various
initial
water
salt
contents.
Micron‐resolution
observations
of
pore
ice
unfrozen
produced
new
insights
into
preferential
orientation
grouping
crystals,
intersections
between
different
crystal
groups
causing
anisotropic
behavior,
decreasing
size
faster
rates,
formation
interconnected
networks
both
upon
freezing.
From
a
thermodynamic
perspective,
content
liquid
dependent
on
local
temperature
as
described
by
water–salt
phase
diagram.
Furthermore,
volume
ratio
reflects
mass
transfer
occurring
due
diffusion
fluid
flow
processes.
work
improves
understanding
complex
phenomena
through
high‐resolution
evidence
crystallization
patterns,
transformation
mechanisms,
coupled
heat‐mass
transfer.
Environmental Toxicology and Chemistry,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 6, 2025
Chloride
concentrations
in
freshwater
are
rising,
with
toxic
effects
on
aquatic
life.
In
temperate
regions
cold
winters,
road
salt
used
for
deicing
paved
surfaces
is
a
primary
cause.
There
evidence
that
water
hardness
can
modify
toxicity,
but
data
insufficient
to
inform
policy.
Because
calcium
ion
influencing
and
there
widespread
decline
lakes,
we
examined
the
of
varying
acute
toxicity
three
Daphnia
species
gain
greater
understanding
hardness-salt
relationship.
We
conducted
48-hr
sodium
chloride
(NaCl)
tests,
using
as
our
metric,
neonates
less
than
24
hrs
old
six
treatments:
1.5
128
mg/L
(hardness
∼7
323
mgCaCO3/L).
determined
effective
concentration
was
lethal
10%,
25%,
50%
sample
populations
from
each
iso-female
line
treatment.
Acute
NaCl
decreased
increased.
The
relationship
between
differed
among
Daphnia,
such
catawba
pulex
were
more
sensitive
lower
treatments
higher
compared
pulicaria.
Our
results
provide
quality
guidelines
not
protective
enough
life
very
soft
(≤3
mg
Ca2+/L,
11.3
CaCO3/L)
because
most
ECxx
values
found
significantly
Canada's
national
short-term
exposure.
already
many
lakes
below
3
mg/L,
global
may
put
ecosystems
at
risk
experiencing
toxicity.
Limnology and Oceanography Letters,
Год журнала:
2023,
Номер
8(6), С. 859 - 866
Опубликована: Июль 25, 2023
Abstract
Widespread
and
increasing
use
of
road
deicing
salt
is
a
major
driver
lake
chloride
concentrations,
which
can
negatively
impact
aquatic
organisms
ecosystems.
We
used
simple
model
to
explore
the
controls
on
concentrations
predict
equilibrium
in
lakes
across
contiguous
United
States.
The
suggests
that
concentration
depends
three
quantities:
application
rate,
density,
runoff
(precipitation
minus
evapotranspiration).
High
combined
with
high
density
leads
regardless
runoff.
Yet
if
be
held
at
current
rates
or
reduced,
many
situated
lightly
moderately
urbanized
watersheds
should
equilibrate
levels
below
currently
recommended
thresholds.
In
particular,
our
predicts
that,
given
2010–2015
rates,
States
will
exceed
regulatory
chronic
exposure
threshold
230
mg
L
−1
over
2000
lakes;
120
9000
hundreds
thousands
lakes.
Our
analysis
helps
contextualize
trends
pollution
lakes,
stabilization
thresholds
designed
protect
an
achievable
goal.
Water Resources Research,
Год журнала:
2024,
Номер
60(6)
Опубликована: Июнь 1, 2024
Abstract
Improving
river
water
quality
requires
a
thorough
understanding
of
the
relationship
between
constituent
concentration
and
discharge
during
runoff
events
(i.e.,
C‐Q
hysteresis),
which
may
be
strongly
non‐linear.
Analysis
hysteresis
on
large
temporal
scales
provides
unprecedented
insights
into
event
dynamics
long‐term
trends
in
surface
groundwater.
Despite
increasing
availability
time
series
data
quality,
there
are
still
limited
quantitative
modeling
frameworks
that
enable
this
analysis.
Here,
we
combine
Bayesian
an
existing
mass
balance
to
model
multi‐decade
series.
We
focus
case
study
chloride
demonstrate
our
can
simultaneously
characterize
size
rotation
hysteresis,
diffuse
low‐flow
inputs
using
only
time‐series
from
Rhine.
Over
28
years
monitoring,
find
exhibits
dominant
clockwise
dilution
behavior
does
not
vary
considerably
under
different
hydro‐climatic
conditions,
hinting
similar
mobilization
mechanisms
over
time.
also
show
decreasing
concentrations
groundwater,
due
cessation
mining
activities
Our
approach
uses
uncertainty
estimates
range
within
parameter
values
lie,
aiding
decision‐makers
robust
assessment
quality.
conclude
powerful
framework
for
investigating
contamination
extended
several
constituents
factors
controlling
their
export,
ultimately
suggesting
mitigation
measures
contamination.
HydroResearch,
Год журнала:
2024,
Номер
7, С. 360 - 371
Опубликована: Янв. 1, 2024
This
study
aims
to
examine
the
trophic
state
conditions
in
three
major
urban
perennial
lakes
of
Coimbatore
district
based
on
physicochemical
properties
and
rotifer
community
structure.
The
was
conducted
for
a
period
months,
from
January
2023
March
2023.
water
plankton
samples
were
collected
twice
month.
measured
showed
that
pH,
salinity,
total
hardness,
nitrate,
phosphate
found
be
higher
Kumarasamy
lake,
followed
by
Ukkadam
Valankulam
lake
ecosystems.
population
density
observed
(1820
Ind./L),
lower
(1080
Ind./L).
In
this
study,
Brachionidae
species
abundantly
environments,
Asplanchnidae,
Lecanidae,
Trichocercidae,
Filiniidae.
addition,
28
freshwater
reported
first
time
district,
respectively.
determined
index
(TSI)
(47.57)
(TSIROT)
(51.25)
values
affirm
are
under
meso-eutrophic
conditions.
examined
diversity
indices
revealed
dominance
(D)
richness
(SR)
Kumaraswamy
difference
may
due
influence
human
activities
mixing
various
points
non-point
sources
pollutants.
present
concluded
moderately
polluted
pollutants;
therefore,
continuous
monitoring
is
needed
conservation
flora
fauna
district.