Water,
Journal Year:
2023,
Volume and Issue:
15(17), P. 3143 - 3143
Published: Sept. 2, 2023
The
purpose
of
this
study
was
to
elucidate
the
patterns
and
mechanisms
driving
seasonal
interannual
variations
carbon
nitrogen
stable
isotopes
in
zooplankton
crustacean
community
Lake
Maggiore
(Italy),
during
period
2009–2020.
Different
taxa
groups
showed
different
ranges
δ13C
signatures,
giving
an
insight
into
food
sources
niche
partition.
In
particular,
cyclopoids
had
a
restricted
range
with
more
negative
δ13C‰
values
increase
fractionation
establishment
water
thermal
vertical
stratification,
highlighting
importance
distribution
as
key
factor
for
coexistence
vertically
heterogenous
environment.
Daphnia
were
positively
related
temperature
(R2
=
0.58
p
<
0.0001
R2
0.68
0.0001,
respectively),
signature
chlorophyll
0.32,
0.0001).
Decomposition
time-series
data
signatures
environmental
parameters
identified
increasing
trends
temperature,
conductivity
decrease
nitrate
that
matched
changes
isotopic
some
(Bosmina,
Diaptomids).
Overall,
observed
interpreted
integrations
effects
climate
warming
Maggiore,
affecting
both
availability
conditions.
Global Biogeochemical Cycles,
Journal Year:
2023,
Volume and Issue:
37(2)
Published: Jan. 18, 2023
Abstract
We
present
long‐term
changes
in
Norwegian
lake
water
quality
across
regional
gradients
atmospheric
pollution,
air
temperature,
hydrology,
and
vegetation
using
(a)
a
national
representative
survey
carried
out
1995
2019
(ThousandLakes),
(b)
an
annual
from
acid‐sensitive
catchments
(78
lakes,
TrendLakes)
1990
to
2020.
Our
analysis
encompasses
all
major
chemical
constituents,
for
example,
anions
cations,
dissolved
organic
matter
(DOM),
nutrients,
iron
(Fe),
silicate
(SiO
2
).
During
these
decades,
environmental
included
declines
sulfur
(S)
nitrogen
(N)
deposition,
climate
warming,
increase
forest
biomass.
Strong
recovery
acidification
is
found,
attributed
large
reductions
moderated
by
catchment
processing
land
use
change.
Browning
counteracted
some
regions,
while
Ca
increased
unexpectedly.
suggest
that
weathering,
enhanced
terrestrial
productivity,
important
driver
of
Ca—substantiated
widespread,
substantial
increases
SiO
.
Light‐
nutrient‐limitation
has
become
more
prevalent,
indicated
higher
DOM,
lower
nitrate
(NO
3
),
NO
total
phosphorous
ratios.
Declines
occurred
independently
N
suggesting
retention,
possibly
productivity.
conclude
decreased
pollution
continues
be
dominant
trends
chemistry,
but
climate‐induced
weathering
processes,
governed
biomass,
likely
have
increasing
impact
on
future
acidity,
nutrient,
light
status,
may
cascade
along
the
aquatic
continuum
rivers
coast.
Journal of Water Resources Planning and Management,
Journal Year:
2023,
Volume and Issue:
149(10)
Published: July 27, 2023
The
unprecedented
changes
in
human
mobility
the
United
States
during
novel
coronavirus
(COVID-19)
pandemic
provided
a
unique
opportunity
to
relate
urban
stream
water
quality
intensity
of
activity
on
six
types
land
use.
This
study
evaluated
baseflow-dominated
response
pH,
total
nitrogen
(TN),
and
nitrate-nitrogen
between
five
in-stream
sampling
sites
located
four
watersheds
with
different
degrees
development
Delaware
County,
Pennsylvania
before
COVID-19
(2018
2021).
investigation
found
that
significant
coincided
dramatic
declines
pandemic.
Human
was
quantified
using
county-level
volunteer
reports
use
Google
apps
electronic
devices.
A
two-way
analysis
variance
identified
TN,
at
all
locations
monthly
flow
decline
movement
activity.
However,
limited
pre-pandemic
design
did
not
observe
overall
trends
for
interaction
lack
could
suggest
due
restrictions
impacted
across
least
similar
fashion.
definitive
evidence
cell
phone
tracking
can
identify
some
impact
nonpoint
sources
spatially
dynamically,
highlighting
role
political
socio-economic
factors
activities
might
be
reflected
changes.
Environmental Monitoring and Assessment,
Journal Year:
2024,
Volume and Issue:
196(7)
Published: June 24, 2024
Abstractta
Changes
to
the
physicochemical
parameters
of
water
in
alpine/mountain
streams
can
provide
evidence
ongoing
natural
and
anthropogenic
processes
their
catchment.
In
this
study,
we
analysed
a
mountain
stream
(Javorinka)
on
north-eastern
side
Tatra
Mountains
(Western
Carpathians),
which
is
minimally
influenced
by
human
activity.
The
was
monitored
weekly
for
5
years
(2017–2021)
evaluated
its
seasonal
variations
parameters.
These
were
large
summer
flash
flood
July
2018.
We
hypothesise
that
floods
are
essential
oligotrophic
profile
streams.
To
support
idea,
our
main
objective
compare
trends
before
after
or
periods
high
flow.
found
hypothesis.
For
example,
there
significant
decrease
chemical
consumption
oxygen
ammonia,
and,
conversely,
an
increase
ratio
saturated
nitrate
concentrations.
Stream
bed
erosion
also
resulted
increased
phosphates
(over
next
2
years)
enrichment
dissolved
solids
spring.
Interestingly
outside
objectives,
observed
sulphates,
especially
autumn
2020
2021,
may
be
related
suppressed
emissions
due
restriction
COVID-19
lockdown.
changes
therefore
idea
excellent
indicators
environmental
processes,
occasional
system.
Revista EIA,
Journal Year:
2024,
Volume and Issue:
21(42)
Published: July 1, 2024
Los
crecientes
procesos
de
expansión
urbana
han
generado
diversas
alteraciones
en
las
propiedades
bioquímicas
y
físicas
los
sistemas
hidrológicos
cuencas,
puesto
que
además
modificar
condiciones
hidrológicas
del
territorio,
incorporan
múltiples
contaminantes
a
cuerpos
agua.
De
esta
manera,
la
contaminación
difusa
resultante
escorrentía
aguas
pluviales,
es
considerada
como
una
principales
causas
degradación
calidad
agua
fuentes
receptoras
zonas
urbanas,
lo
cual
particularmente
relevante
regiones
lluviosas
el
trópico
suramericano
donde
desarrollo
gestión
son
poco
planificados.
Este
artículo
presenta
resultados
evaluación
relación
entre
uso
suelo
escorrentía,
considerando
diferentes
características
lluvia.
muestreos
se
realizaron
ciudad
Medellín,
Colombia
con
diferente
suelo.
Se
estudiaron
parámetros
básicos
agua,
algunas
urbana.
mostraron
sólidos
suspendidos
totales
presentaron
alta
variabilidad,
especialmente
zona
residencial,
ocasionando
así
complejidad
control
actividades
allí
desarrollan.
Por
otra
parte,
mayores
niveles
observados
encontraron
industrial,
presencia
coberturas
muy
baja
o
nula
permeabilidad
aumento
actividad
antrópica
generan
fuerte
alteración
escorrentía.
Estos
abren
puerta
cuestionamientos
cuanto
al
impacto
composición
química
pluviales
promueven
mejor
comprensión
superficial
por
ende
visión
más
completa
interacciones
presentan
un
ecosistema
urbano,
estableciendo
herramienta
clave
para
hídrica
cuencas
urbanas.
