Journal of Plankton Research,
Год журнала:
2024,
Номер
46(4), С. 403 - 420
Опубликована: Июнь 7, 2024
Abstract
The
subtropical
to
subpolar
planktic
foraminifera
Globigerina
bulloides
is
a
calcifying
marine
protist,
and
one
of
the
dominant
foraminiferal
species
Nordic
Seas.
Previously,
relative
abundance
shell
geochemistry
fossil
G.
have
been
studied
for
palaeoceanographic
reconstructions.
There
however
lack
biological
observations
on
poor
understanding
its
ecological
tolerances,
especially
high
latitude
genotypes.
Here,
we
present
from
first
extensive
culturing
under
conditions,
including
low
temperature
(6–13°C)
variable
salinity
(30–38)
experiments.
Carbonate
chemistry
(pH
[CO32−])
was
also
manipulated.
Experimental
conditions
were
chosen
reflect
range
plausible
past
future
scenarios
We
found
be
tolerant
environmental
well
outside
their
optimal
(<10°C,
<33,
pH
<8).
Observed
life
span
up
three
months,
which
attributed
microalgal
diet.
Two
alternative
strategies
employed,
whereby
individuals
either
experienced
rapid
growth
death,
or
prolonged
lifespan
with
minimal
death
via
slow
decay.
posit
this
could
help
explain
differences
in
geochemical
signals
recorded
different
size
fractions
specimens
used
Progress In Oceanography,
Год журнала:
2023,
Номер
219, С. 103133 - 103133
Опубликована: Сен. 29, 2023
The
Barents
Sea
is
undergoing
rapid
ocean
warming
with
less
sea
ice
and
increased
Atlantic
inflow,
shifting
the
pelagic
ecosystem
towards
a
more
boreal
one,
process
referred
to
as
Atlantification.
While
such
changes
have
already
been
documented
in
southern
central
Sea,
known
about
degree
of
Atlantification
northern
Arctic
Ocean.
In
this
seasonal
study,
we
identified
mesozooplankton
biodiversity,
abundance
biomass
Northern
along
transect
seven
stations
stretching
from
(76°N)
across
shelf
break
into
Ocean
(82°N)
August
December
2019,
March,
May
July
2021.
broad
range
taxa
sizes
were
collected
by
conducting
duplicate
depth-stratified
tows
using
alternate
nets
mesh-sizes
64
µm
180
µm.
majority
zooplankton
ubiquitous
study
area,
but
abundances
life
stages
varied
depending
on
season,
region
dominant
water
mass.
We
three
distinct
biogeographical
regions
different
diversity
dynamics;
i)
south
Polar
Front,
ii)
shelf,
iii)
slope
During
summer,
high
Atlantic/boreal
cosmopolitan
zooplankton,
mainly
Calanus
finmarchicus,
Metridia
longa,
Oithona
similis
Microsetella
norvegica
found
just
Front
Sea.
On
species,
glacialis,
Pseudocalanus
spp.,
Limacina
helicina
dominated
year-round
relatively
stable
biomass.
northernmost
stations,
peaks
C.
finmarchicus
Oncaeidae
(Triconia
borealis
Oncaea
spp.)
occurred
winter,
combined
bathypelagic
species
Paraeuchaeta
Scaphocalanus
brevicornis,
Spinocalanus
Gaetanus
brevispinus
Heterorhabdus
norvegicus.
Hence,
when
comparing
communities
at
locations
seasons,
four
identified:
spring,
future,
stronger
advection
northward
expansion
may
be
anticipated
affect
endemic
energy-richer
communities.
Progress In Oceanography,
Год журнала:
2024,
Номер
224, С. 103267 - 103267
Опубликована: Май 3, 2024
Global
warming
is
causing
rapid
change
in
marine
food
webs,
particularly
at
northern
latitudes
where
temperatures
are
increasing
most
rapidly.
In
this
study,
the
diet
of
common
minke
whales
Balaenoptera
acutorostrata
was
assessed
both
terms
short-term
(morphological
analyses
digestive
tract
contents)
and
longer-term
(tissue
chemical
markers:
fatty
acids
stable
isotopes)
prey
use
Barents
Sea
to
see
if
they
shifting.
Samples
(blubber
cores,
muscle,
stomach
were
obtained
from
158
taken
during
Norwegian
commercial
whaling
operations
summer
over
period
2016–2020.
Two
items,
capelin
Mallotus
villosus
krill
(primarily
Thysanoessa
sp.),
dominated
contents
entire
investigation,
which
included
sampling
June
August,
similar
findings
earlier
studies.
A
few
gadoids
also
observed
whale
stomachs.
Lower
blubber
acid
(FA)
2016/2017
as
compared
with
2018/2019
observed.
This
likely
explained
by
differences
time
(June
vs
August
2018/2019,
i.e.,
after
a
longer
feeding
latter
case).
explanation
fits
fact
that
FA
profiles
more
potential
prey,
presumably
reflecting
two
months
assimilation
for
these
whales.
Multidimensional
mixing
models
based
on
carbon
nitrogen
isotope
composition
groups
suggested
ate
mostly
four
five
years.
2018
there
indications
higher
proportion
gadoid
fish,
showing
some
dietary
flexibility.
The
trophic
level
whales'
feeding,
interpreted
values,
positively
correlated
thickness
suggesting
fish-eaters
tended
assimilate
energy
than
focused
exclusively
lower
prey.
variation
different
methods
−
contents,
acids,
isotopes
–
reflects
turnover
times,
muscle
representing
several
integration,
while
lipid
stores
dynamic
may
represent
weeks,
events
last
hours.
small
pelagic
fishes
(in
past)
greater
quantity
demersal
fish
(seen
study)
suggests
responding
ongoing
borealization
ecosystem.
Philosophical Transactions of the Royal Society B Biological Sciences,
Год журнала:
2024,
Номер
379(1909)
Опубликована: Июль 22, 2024
Climate
change
affects
ecosystems
at
several
levels:
by
altering
the
spatial
distribution
of
individual
species,
locally
rewiring
interspecific
interactions,
and
reorganizing
trophic
networks
larger
scales.
The
dynamics
marine
food
webs
are
becoming
more
sensitive
to
processes
connections
in
seascape.
As
a
case
study,
we
study
atlantification
Barents
Sea:
compare
spatio-temporal
subsystems
three
identity
key
organisms,
critically
important
interactions
entire
web.
Network
analysis
offers
quantitative
measurements,
including
centrality
indices,
similarity
topological
measure
interaction
asymmetry
network-level
measures.
We
found
that
alters
species
(boreal
demersals
hubs),
results
strongly
asymmetric
(dominated
haddock),
changes
dominant
regulation
regime
(from
bottom-up
wasp-waist
control)
makes
web
less
modular.
Since
may
be
quite
network
construction,
aggregation
data
was
explicitly
studied
increase
robustness
analysis.
an
alternative,
mathematical
algorithm
better
preserves
some
properties
(e.g.
density)
original,
unaggregated
than
biologically
inspired
into
functional
groups.
This
article
is
part
theme
issue
‘Connected
interactions:
enriching
research
social
interactions’.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Дек. 2, 2024
Abstract
Glaciers
in
the
Arctic
have
lost
considerable
mass
during
last
two
decades.
About
a
third
of
glaciers
by
area
drains
into
ocean,
yet
mechanisms
and
drivers
governing
loss
at
glacier
calving
fronts
are
poorly
constrained
part
due
to
few
long-term
glacier-ocean
observations.
Here,
we
combine
detailed
satellite-based
record
front
ablation
for
Austfonna,
largest
ice
cap
on
Svalbard,
with
in-situ
ocean
records
from
an
offshore
mooring
modelled
freshwater
runoff
period
2018-2022.
We
show
that
submarine
melting
occur
almost
exclusively
autumn
all
types
outlet
glaciers,
even
surging
fast-flowing
Storisstraumen.
Ocean
temperature
controls
observed
frontal
ablation,
whereas
subglacial
surface
meltwater
appears
little
direct
impact
total
ablation.
The
seasonal
warming
waters
varies
both
magnitude,
depth
timing,
suggesting
complex
interplay
between
inflowing
Atlantic-influenced
water
seasonally
warmed
Barents
Sea.
immediate
response
suggests
marine-terminating
high
regions
exposed
Atlantification
prone
rapid
changes
should
be
accounted
future
projections.
Geoscience Data Journal,
Год журнала:
2025,
Номер
12(2)
Опубликована: Март 17, 2025
ABSTRACT
Recent
decline
of
sea
ice
in
the
Barents
Sea
represents
a
clear
manifestation
ongoing
Arctic
warming.
This
study
presents
compilation
data
sets
on
physics
acquired
during
2018–2022
Nansen
Legacy—a
Norwegian
multidisciplinary
national
research
programme
that
focused
northern
Sea.
The
were
using
variety
methods
such
as
coring,
thickness
drillings,
snow
pits,
depth
surveys,
drone
flights,
on‐ice
and
helicopter‐borne
electromagnetic
measurements
thickness,
draft
by
bottom‐anchored
moorings.
collected
cover
several
key
physical
parameters
describing
encompass
range
spatial
(local
to
regional)
temporal
(daily
annual)
scales.
These
aid
filling
substantial
knowledge
gap
recent
conditions
rapidly
changing
region.
