ACS ES&T Water,
Год журнала:
2024,
Номер
5(1), С. 20 - 32
Опубликована: Дек. 10, 2024
Metals
are
ubiquitous
in
Earth's
Critical
Zone
and
play
key
roles
ecosystem
function,
human
health,
water
security.
They
essential
nutrients
at
low
concentrations,
yet
some
metals
toxic
a
high
dose.
Permafrost
thaw
substantially
alters
all
the
physical
chemical
processes
governing
metal
mobility,
including
movement
solute
transport
(bio)geochemical
interactions
involving
water,
organic
matter,
minerals,
microbes.
The
outcomes
of
these
interconnected
changes
nonintuitive
hold
global
implications
for
resources
health.
This
Perspective
outlines
primary
factors
affecting
mobility
thawing
permafrost
underscores
urgent
need
priorities
interdisciplinary
research
to
better
understand
this
emerging
issue.
Scientific Reports,
Год журнала:
2023,
Номер
13(1)
Опубликована: Окт. 4, 2023
Abstract
Climate
change
affects
the
Arctic
more
than
any
other
region,
resulting
in
evolving
weather,
vanishing
sea
ice
and
altered
biochemical
cycling,
which
may
increase
biotic
exposure
to
chemical
pollution.
We
tested
thermoregulatory
impacts
of
these
changes
on
most
abundant
seabird,
little
auk
(
Alle
alle
).
This
small
diving
species
uses
ice-habitats
for
foraging
zooplankton
resting.
equipped
eight
auks
with
3D
accelerometers
monitor
behavior,
ingested
temperature
recorders
measure
body
(T
b
also
recorded
weather
conditions,
collected
blood
assess
mercury
(Hg)
contamination.
There
were
nonlinear
relationships
between
time
engaged
different
behaviors
T
.
increased
ice,
following
declines
while
polar
waters,
but
changed
when
birds
resting
water.
flying,
decreased
at
colony
after
being
elevated
during
flight.
Weather
not
Hg
contamination,
affected
However,
given
our
sample
size,
further
research
regarding
effects
is
warranted.
Results
suggest
that
varies
behavior
loss
due
global
warming
cause
energic
challenges
trips
sea.
Abstract
Climate
change
is
transforming
bioenergetic
landscapes,
challenging
behavioral
and
physiological
coping
mechanisms.
A
critical
question
involves
whether
animals
can
adjust
patterns
energy
expenditure
to
stabilize
fitness
given
reconfiguration
of
resource
bases,
or
limits
plasticity
ultimately
compromise
balance.
In
the
Arctic,
rapidly
warming
temperatures
are
food
webs,
making
Arctic
organisms
strong
models
for
understanding
biological
implications
climate
change‐related
environmental
variability.
We
examined
in
daily
(DEE)
an
seabird,
little
auk
(
Alle
alle
)
response
variability
change‐sensitive
drivers
availability,
sea
surface
temperature
(SST)
ice
coverage
(SIC),
tested
hypothesis
that
energetic
ceilings
exposure
mercury,
important
neurotoxin
endocrine
disrupter
marine
ecosystems,
may
limit
scope
plasticity.
To
estimate
DEE,
we
used
accelerometer
data
obtained
across
years
from
two
colonies
exposed
distinct
conditions
(Ukaleqarteq
[UK],
East
Greenland;
Hornsund
[HS],
Svalbard).
proceeded
model
future
changes
SST
predict
impacts.
At
UK,
high
flight
costs
linked
low
SIC
drove
DEE
below
above
4
×
basal
metabolic
rate
(BMR),
a
proposed
threshold
breeding
birds.
However,
remained
7
BMR,
alternative
threshold,
did
not
plateau.
Birds
at
HS
experienced
higher,
relatively
invariable
SST,
operated
BMR.
Mercury
was
unrelated
stable.
Thus,
currently
buffers
fitness,
providing
resiliency
against
change.
Nevertheless,
modeling
suggests
continued
promote
accelerating
increases
which
become
unsustainable.
Water Resources Research,
Год журнала:
2023,
Номер
59(11)
Опубликована: Окт. 30, 2023
Abstract
Climate
change
and
permafrost
thaw
may
impact
the
mobilization
of
terrestrial
dissolved
organic
carbon
(DOC),
mercury
(Hg),
neurotoxic
methylmercury
(MeHg)
into
aquatic
ecosystems;
thus,
understanding
processes
that
control
analyte
export
in
northern
catchments
is
needed.
We
monitored
water
chemistry
for
3
years
(2019–2021)
at
a
peatland
catchment
(Scotty
Creek)
mixed
(Smith
Dehcho
(Northwest
Territories),
within
discontinuous
zone
boreal
western
Canada.
The
had
higher
DOC
MeHg,
but
lower
total
Hg
concentrations
(mean
±
standard
deviation;
19
2.6
mg
L
−1
;
0.08
0.04
ng
DMeHg
1.1
0.3
THg
)
than
(12
4.4
0.05
0.01
3.1
2.2
).
Analyte
increased
with
discharge
catchment,
suggesting
transport
limitation
flushing
near‐surface,
organic‐rich
flow
paths
during
wet
periods.
In
contrast,
were
not
primarily
associated
discharge.
MeHg
concentrations,
MeHg:THg,
MeHg:DOC
temperature,
enhanced
methylation
warmer
Mean
open
season
yields
greater
more
variable
from
(1.1–6.6
vs.
1.4–2.4
g
m
−2
5.2–36
6.1–10
Crucial
storage
thresholds
controlling
runoff
generation
likely
drove
inter‐annual
variability
catchment.
Our
results
suggest
climate
influence
production
boreal‐Arctic
as
temperatures
increase,
peatlands
thaw,
altered.
Arctic Science,
Год журнала:
2024,
Номер
10(2), С. 305 - 320
Опубликована: Янв. 23, 2024
This
study
investigated
methylmercury
(MeHg)
concentrations
in
Arctic
benthic
invertebrates
from
two
shelf
sites
the
Canadian
Beaufort
Sea.
Carbon,
nitrogen,
and
sulfur
stable
isotopes
fatty
acids
were
measured
to
examine
diet
influences
on
MeHg
476
individuals
53
taxa
of
representing
three
different
feeding
guilds.
Taxonomic
identifications
based
DNA-barcoding
traditional
taxonomy.
ranged
3
421
ng/g
dry
weight
increased
over
trophic
levels
(δ
15
N
range
=
4.4–14.2‰).
Organic
matter
sources
had
small
but
significant
bioaccumulation
food
web.
Carbon
isotope
ratios
13
C,
−25.5
−19.8‰)
positively
correlated
with
concentrations,
suggesting
greater
reliance
carbon
contributed
higher
concentrations.
Sulfur
unrelated
Fatty
suggested
diatoms
versus
dinoflagellates,
resources
influenced
Higher
observed
at
site
closer
Mackenzie
River
mouth
than
Cape
Bathurst
site.
generated
most
taxonomically
rich
dataset
marine
benthos
date
provides
a
basis
for
future
research
web
dynamics
