Frontiers in Marine Science,
Journal Year:
2022,
Volume and Issue:
9
Published: Nov. 22, 2022
Severe
human
activities
in
coastal
areas
have
greatly
impacted
the
sources
and
biogeochemical
behaviors
of
organic
matter
(OM),
including
particulate
OM
(POM)
dissolved
(DOM).
However,
few
studies
incorporated
indices
POM
DOM
to
address
this
issue.
Here,
a
dataset
combination
stable
isotopes
carbon
nitrogen
optical
properties
was
presented
Xi
Bay,
semi-enclosed
bay
with
highly
developing
industrial
port
Beibu
Gulf,
South
China,
reveal
origin,
distribution,
fate
during
rainy
season.
In
upper
bay,
depleted
δ
13
C
suggested
that
(POC)
mainly
originated
from
terrestrial
sources.
negative
relationship
between
chromophoric
(CDOM)
(PN)
bacterial-mediated
decomposition
may
be
primary
source
CDOM.
The
correlation
humic-like
fluorescent
components
(C1
C2)
salinity
those
two
were
affected
by
input.
significant
protein-like
component
(C3)
Chl
C3
derived
phytoplankton
production
bay.
lower
increase
values
indicated
an
increased
contribution
marine
POC.
high
levels
CDOM
due
(fresh)
POM.
low
C1
C2
might
dilution
seawater,
enhanced
production.
addition,
enhancement
15
N
both
bays
serious
pollution
This
study
highlights
biological
fueled
excess
nutrients
is
dominant
dynamic
process
impact
Gulf.
Environmental Science & Technology,
Journal Year:
2022,
Volume and Issue:
56(8), P. 5037 - 5048
Published: April 8, 2022
Increasing
human
activities
are
altering
marine
ecosystems,
which
may
have
ramifications
for
predator
feeding
ecology
and,
thus,
the
degree
of
contaminant
exposure.
We
conducted
first
investigation
spatiotemporal
trends
nine
alternative
halogenated
flame
retardants
(AHFRs)
and
their
relations
with
dietary
variations
in
128
humpback
dolphins
that
were
stranded
along
northern
South
China
Sea
during
2003-2020.
detected
highest
levels
seven
major
AHFRs
compared
results
reported
cetaceans
globally,
indicating
high
AHFR
contamination
coastal
regions
China.
Dolphins
near
urban
generally
contained
higher
concentrations
than
those
rural
areas,
mirroring
environmental
occurring
this
area.
Model-generated
diet
estimates
suggested
reduced
consumption
trophic-level
prey
recent
years,
likely
attributable
to
overfishing-induced
decline
region.
After
adjusting
due
changes,
temporal
only
slightly
altered.
Our
suggest
increasing
discharges
into
2000s
2010s
had
a
greater
influence
on
shifts.
Frontiers in Earth Science,
Journal Year:
2022,
Volume and Issue:
9
Published: Feb. 14, 2022
The
Coorong
Lagoon
is
a
unique
hydrological
and
depositional
system
at
the
terminus
of
Murray–Darling
Basin,
largest
river
in
Australia.
It
exhibits
large
salinity,
nutrient,
organic
matter
gradients,
providing
modern
analogue
to
study
validate
use
δ
15
N
13
C
as
tracers
past
contemporary
geochemical
cycles
estuarine
environments.
To
this
end,
water
surface
sediment
samples
were
analyzed
for
particulate
nitrogen
(PON)
carbon
(POC)
concentrations,
respective
signatures
carbon.
PON
POC
exhibited
positive
relationships
chlorophyll-a,
indicating
dominance
phytoplankton
production
upon
suspended
matter.
There
was
also
general
trend
increasing
(δ
)
values
decreasing
PC
with
salinity
eutrophication
restricted
South
Lagoon.
In
multiple
linear
regression
,
best
two
predictors
combination
are
C:N
molar
ratio,
highlighting
importance
productivity
type
or
source
For
total
dissolved
phosphorus
latitude,
suggesting
influences
from
proximity
ocean.
Sediment
across
overlap
column,
that
derived
algal
material
represents
main
lagoon
sediments.
We
hypothesize
limited
loss
via
denitrification
leads
being
recycled
almost
exclusively
ammonium,
due
low
rates
nitrification
dissimilatory
nitrate
reduction
ammonium
(DNRA).
propose
preferential
volatilization
14
ammonia
increases
assimilated
by
phytoplankton,
thereby
within
By
contrast,
gradient
data
countered
relatively
constant
sedimentary
C.
Data
Coorong,
therefore,
suggest
sediments
can
be
used
infer
palaeoproductivity
hypereutrophic
hypersaline
environment,
however,
measured
may
influenced
DIC
during
sedimentation
alter
record
