PLoS ONE,
Год журнала:
2015,
Номер
10(7), С. e0131598 - e0131598
Опубликована: Июль 2, 2015
Fatty
acids
are
among
the
least
understood
nutrients
in
marine
environments,
despite
their
profile
as
key
energy
components
of
food
webs
and
that
they
essential
to
all
life
forms.
Presented
here
is
a
novel
approach
predict
spatial-temporal
distributions
fatty
resources
using
generalized
additive
mixed
models.
acid
tracers
(FAT)
primary
producers,
nutritional
condition
indices
concentrations
two
long-chain
(≥C20)
omega-3
(EFA)
measured
muscle
albacore
tuna,
Thunnus
alalunga,
sampled
south-west
Pacific
Ocean
were
response
variables.
Predictive
variables
were:
location,
time,
sea
surface
temperature
(SST)
chlorophyll-a
(Chla),
phytoplankton
biomass
at
time
catch
curved
fork
length.
The
best
model
fit
for
parameters
included
fish
length
SST.
first
oceanographic
contour
maps
EFA
FAT
(FATscapes)
produced
demonstrated
clear
geographical
gradients
study
region.
Predicted
changes
reflected
shifts
size-structure
dominant
producers.
Model
projections
show
supply
availability
likely
be
negatively
affected
by
increases
SST
especially
temperate
waters
where
12%
reduction
both
total
content
proportions
predicted.
Such
will
have
large
implications
associated
health
benefits
high-order
consumers.
Results
convey
new
concerns
on
impacts
projected
climate
change
fish-derived
systems.
Frontiers in Plant Science,
Год журнала:
2016,
Номер
7
Опубликована: Март 16, 2016
We
tested
the
influence
of
two
light
intensities
[40
and
300
μmol
PAR
/
(m(2)s)]
on
fatty
acid
composition
three
distinct
lipid
classes
in
four
freshwater
phytoplankton
species.
chose
species
different
taxonomic
order
to
detect
potentially
similar
reaction
characteristics
that
might
also
be
present
natural
communities.
From
samples
bacillariophyte
Asterionella
formosa,
chrysophyte
Chromulina
sp.,
cryptophyte
Cryptomonas
ovata
zygnematophyte
Cosmarium
botrytis
we
first
separated
glycolipids
(monogalactosyldiacylglycerol,
digalactosyldiacylglycerol,
sulfoquinovosyldiacylglycerol),
phospholipids
(phosphatidylcholine,
phosphatidylethanolamine,
phosphatidylglycerol,
phosphatidylinositol,
phosphatidylserine)
as
well
non-polar
lipids
(triacylglycerols),
before
analyzing
each
class.
High
variation
existed
among
Individual
compositions
differed
their
changing
Although
no
generalizations
could
made
for
across
classes,
individual
showed
clear
but
small
responses
ecologically-relevant
omega-3
omega-6
polyunsaturated
acids
(PUFA)
terms
proportions
per
tissue
carbon
quotas.
Knowledge
how
like
change
with
environmental
or
culture
conditions
is
great
interest
ecological
food
web
studies,
aquaculture,
biotechnology,
since
algal
are
most
important
sources
long-chain
PUFA
aquatic
terrestrial
consumers,
including
humans.
Limnology and Oceanography,
Год журнала:
2020,
Номер
65(8), С. 1706 - 1722
Опубликована: Фев. 18, 2020
Abstract
Understanding
marine
ecosystem
structure
and
functioning
is
crucial
in
supporting
sustainable
management
of
natural
resources
monitoring
the
health
ecosystems.
The
current
study
utilized
stable
isotope
(SI)
mixing
models
trophic
position
to
examine
energy
flow,
relationships,
benthic‐pelagic
coupling
between
food
web
components.
Roughly
1900
samples
from
different
levels
web,
collected
during
2001–2010
four
northern
central
sub‐basins
Baltic
Sea,
were
analyzed
for
SI
ratios
carbon
nitrogen.
Trophic
webs
among
was
consistent,
but
there
differences
proportions
that
had
originated
benthic
habitat.
Mysids
amphipods
served
as
important
links
pelagic
Much
(35–65%)
their
zone
transferred
higher
by
consumption
herring
(
Clupea
harengus
).
One
percent
twenty‐four
apex
seal
predators
Halichoerus
grypus
Pusa
hispida
)
predatory
fish
Salmo
salar
derived
zone.
Diets
mysids
differed,
although
some
overlap
dietary
niches
observed.
Gulf
Finland
more
influenced
subsystem
than
other
sub‐basins.
baseline
δ
13
C
15
N
differed
indicating
input
organic
matter
nutrients
each
sub‐basin.
AMBIO,
Год журнала:
2020,
Номер
50(1), С. 203 - 214
Опубликована: Апрель 20, 2020
Dense
blooms
of
diazotrophic
filamentous
cyanobacteria
are
formed
every
summer
in
the
Baltic
Sea.
We
estimated
their
contribution
to
nitrogen
fixation
by
combining
two
decades
cyanobacterial
biovolume
monitoring
data
with
recently
measured
genera-specific
rates.
In
Bothnian
Sea,
rates
were
80
kt
N
year-1,
which
has
doubled
during
recent
and
now
exceeds
external
loading
from
rivers
atmospheric
deposition
69
year-1.
The
Proper
was
399
agrees
well
previous
estimates
using
other
approaches
is
greater
than
input
374
Our
approach
can
potentially
be
applied
continuously
estimate
loads
via
fixation.
Those
crucial
for
ecosystem
adaptive
management
since
internal
may
counteract
positive
effects
decreased
nutrient
loading.
