Exploring factors that affect Microcystis abundance in the sacramento san joaquin delta
Harmful Algae,
Journal Year:
2024,
Volume and Issue:
138, P. 102682 - 102682
Published: June 25, 2024
Cyanobacteria
harmful
algal
blooms
(cHABs)
are
increasing
in
frequency,
intensity
and
duration
estuaries
worldwide.
In
the
upper
San
Francisco
Estuary,
also
known
as
Sacramento
Joaquin
Delta
(Delta),
cHABs
have
been
a
topic
of
concern
over
past
two
decades.
response,
managers
urgently
working
to
understand
factors
that
drive
identify
feasible
management
options
avert
ecological
human
health
consequences.
We
used
six
year
data
set
explore
relationships
between
flow
parameters,
temperature,
Microcystis
biovolume
determine
potential
for
managing
large
scale
hydrodynamic
conditions
address
cHABs.
looked
at
relationship
low
salinity
zone
see
if
it
could
be
proxy
residence
time,
because
time
is
positively
related
cyanobacteria
abundance.
found
not
useful
area
experiences
most
severe
Our
finding
suggest
climatic
(i.e.,
temperature
water
type)
greatest
influence
on
Delta,
with
higher
during
years
lower
temperatures.
Further,
there
interannual
differences
cannot
fully
explained
by
parameters
or
meaning
other
included
our
model
may
involved.
conclude
actions
increase
ineffective
reducing
desired
levels
temperatures
remain
high.
Language: Английский
Spatial Pattern Assessment and Prediction of Water and Sedimentary Mud Quality Changes in Lake Maurepas
Environments,
Journal Year:
2024,
Volume and Issue:
11(12), P. 268 - 268
Published: Nov. 25, 2024
Lake
Maurepas,
Louisiana,
holds
ecological,
recreational,
and
economic
significance,
but
recent
concerns
have
arisen
over
its
water
quality
due
to
industrial
activities.
From
June
November
2023,
we
investigated
sediment
at
nine
sites
three
depths.
Results
showed
that
NH3-N
levels
were
within
safety
limits
(0.11
±
0.10
mg/L),
while
Total
Nitrogen
(TN,
0.83
0.65
Phosphorus
(TP,
0.32
0.13
Chemical
Oxygen
Demand
(COD,
25.94
11.37
Arsenic
(As,
0.26
0.17
Lead
(Pb,
0.23
0.002
mg/L)
exceeded
acceptable
thresholds.
Spatial-temporal
analysis
revealed
significant
variations
across
sites,
depths,
sampling
dates.
Major
contaminant
sources
included
discharges
from
the
Tickfaw,
Amite,
Blind
rivers,
as
well
a
vehicle
accident
on
Pass
Manchac.
Seismic
drilling
activities
by
Air
Products
Chemicals
had
little
no
observed
impact.
Four
AI
algorithms
also
evaluated
using
different
physical
parameter
inputs
predict
December’s
chemical
pollutant
levels,
which
missing
adverse
weather.
The
LSTM
model
outperformed
others,
achieving
R2
values
of
0.852
for
COD,
0.869
TN,
0.842
As,
0.921
TP
Pb.
Predictions
indicated
decreasing
in
December,
matched
salinity
specific
conductance
measurements,
reverted
those
September
October.
This
pattern
is
attributed
settling
contaminants
Manchac
ongoing
Language: Английский