Water Science & Technology Water Supply,
Journal Year:
2021,
Volume and Issue:
21(4), P. 1843 - 1860
Published: Jan. 22, 2021
Abstract
This
research
work
was
carried
out
from
July
2018
to
June
2019.
WQI
method
utilized
examine
the
seasonal
changes
in
water
quality
that
can
indicate
potential
use
of
future.
Water
samples
were
tested
three
locations
along
Mandakini
River.
Fourteen
physical
and
chemical
parameters
analyzed.
All
inside
admissible
furthest
reaches
WHO
for
drinking
except
turbidity,
especially
monsoon
season.
Twelve
taxa
macroinvertebrates
(Philopotamus
sp.,
Laptophlebia
Isoperla
Diploperla
Tabanus
Hydropsyche
Baetis
Glossosoma
Heptagenia
Ephemerella
Psephenus
Protandrous
sp.)
identified
The
fundamental
goal
this
investigation
evaluate
effects
on
benthic
macroinvertebrate
diversity
physicochemical
variables
study
also
affirmed
tourist-generated
waste
disposal
poisonous
dangerous
chemicals
farming
are
key
components
liable
deterioration
during
Environment International,
Journal Year:
2020,
Volume and Issue:
140, P. 105816 - 105816
Published: May 28, 2020
Class
1
integrons
are
strongly
associated
with
the
dissemination
of
antibiotic
resistance
in
bacteria.
However,
little
is
known
about
whether
presence
antibiotics
affects
abundance
and
genes
during
biological
wastewater
treatment.
To
explore
roles
class
spreading
environmental
compartments,
dynamics
were
followed
biofilm
reactors
treating
synthetic
respectively
spiked
streptomycin
(STM)
oxytetracycline
(OTC).
The
relative
integron-integrase
gene
(intI1)
increased
12
or
29-fold
when
treated
STM
OTC,
under
incrementally
increasing
dosage
regimes
from
0
to
50
mg
L-1.
Significant
increases
intI1
initially
occurred
at
an
dose
0.1
At
beginning
experiment,
51%
64%
carried
no
cassettes.
In
OTC
systems,
there
was
a
significant
increase
proportion
that
contained
cassettes,
particularly
intermediate
higher
concentrations.
Gene
cassettes
encoding
aminoglycosides,
trimethoprim,
beta-lactam,
erythromycin,
quaternary
ammonium
compounds
all
detected
systems.
Three
tetracycline
(tetA,
tetC,
tetG)
significantly
correlated
(p
<
0.01),
despite
tet
being
present
as
cassette.
Genome
sequencing
isolates
showed
synteny
between
intI1,
mediated
through
linkage
transposable
elements
including
Tn3,
IS26
ISCR3.
appeared
be
positive
selection
antibiotics,
might
have
actively
acquired
new
experiment.
Frontiers in Environmental Chemistry,
Journal Year:
2025,
Volume and Issue:
6
Published: Feb. 5, 2025
The
Asan
Wetland
is
an
important
freshwater
wetland
in
Uttarakhand’s
Dehradun
district.
It
known
for
its
diverse
flora
and
fauna
as
a
stopover
migratory
birds.
Periphyton,
essential
biological
component
of
aquatic
ecosystems,
serves
bioindicator
water
quality
ecosystem
integrity.
This
study
fills
gap
our
knowledge
the
Wetland’s
ecological
health
by
analyzing
periphyton
populations
number
physicochemical
characteristics
across
three
selected
sites
from
November
2021
to
October
2023.
Selected
named
Site
1(S1),
2(S2),
3
(S3).
Monthly
variations
parameters
such
temperature,
pH,
turbidity,
transparency,
total
dissolved
solids
(TDS),
electrical
conductivity,
oxygen
(DO),
hardness,
alkalinity,
demand
(BOD),
chemical
(COD),
nutrients
were
collected,
identified
assessed
using
Ms-excel
Past
software.
Phosphorus
levels
indicated
moderate
high
nutrient
load
,
peaking
August
(
1.20–1.25
mg/L
)
all
dropping
their
lowest
January
0.35–0.65
).
Nitrate
moderate,
with
highest
concentrations
December
1.40–1.55
July
0.25–0.35
),
showing
similar
seasonal
patterns
sites.
was
represented
this
18
different
periphytic
taxa
that
belong
classes.
These
classes
include
Bacillariophyceae
(Cymbella,
Navicula,
Nitzschia,
Fragilaria
Meridion,
Synedra,
Gomphonema,
Tabellaria,
Diatoma),
members
Chlorophyceae
Ulothrix,
Spirogyra,
Cosmarium,
Microspora,
Chlorella,
Oedogomium,
Zygnema,
Cladophora
are,
while
Phormidium
member
Cyanophyceae.
peak
density
(individuals/cm
2
recorded
322.67
±
89.08
×
10
January,
exhibiting
maximum
values
at
S3,
minimum
5.57
10³
August.
annual
percentage
composition
over
years
indicates
constituted
predominant
group
(89%–90%),
succeeded
(7%–9%)
Cyanophyceae
or
Myxophyceae
(1%–4%)
canonical
correspondence
analysis
(CCA)
among
during
both
suggested
S3
more
diverse,
followed
S1
S2,
64.93%,
35.07%
variance
eigenvalues
0.01794,
0.00968
respectively.
PCA
PC1
PC2
93.98%
6.015%
279.149
17.8675,
respectively
multivariate
cluster
showed
similarity
2-year
study.
findings
emphasize
need
targeted
management
strategies
maintain
Wetland.
Frontiers in Environmental Science,
Journal Year:
2025,
Volume and Issue:
13
Published: March 4, 2025
Introduction
In
recent
years,
river
ecosystem
stability
has
been
increasingly
threatened
by
human
activities
and
climate
change.
Comprehensive
quantification
of
systematic
analysis
its
response
to
change
are
essential
for
effective
conservation
management.
Methods
Thus,
this
study
proposed
a
novel
quantitative
approach
integrating
the
driving
factors.
The
Han
River
Basin
in
China
was
selected
as
area
due
distinctive
characteristics
significant
anthropogenic
impact.
Both
external
factors,
including
urbanization,
dam
construction,
precipitation,
internal
such
TP,
DO,
EC,
were
considered
Results
results
revealed
that
compared
upstream,
resilience
lower
reaches
decreased
35.75%
resistance
8.2%,
suggesting
from
upstream
downstream.
Urbanization
had
most
negative
impact
on
stability,
followed
precipitation
construction.
Among
EC
three
main
factors
affecting
increases
these
contributed
positively
enhancing
stability.
Discussion
These
findings
highlight
need
targeted
strategies
mitigate
human-induced
disturbances
enhance
Based
results,
specific
recommendations
support
watershed
management
ecological
restoration,
providing
valuable
insights
sustainable
conservation.
Diversity,
Journal Year:
2023,
Volume and Issue:
15(2), P. 180 - 180
Published: Jan. 27, 2023
Potential
changes
in
phytoplankton
community
structure
shallow
lakes
due
to
land
use
could
pose
a
serious
threat
ecosystem
sustainability
and
functioning.
Nevertheless,
this
effect
has
not
been
analyzed
detail.
In
study,
we
chose
two
adjacent
lakes,
the
main
types
around
them
are
farmland
forest,
respectively.
We
investigated
spatial
differences
structure,
water
quality
physicochemical
parameters,
patterns
lakes.
The
results
indicated
that
annual
average
cell
density
biomass
of
former
were
1.84
times
2.38
latter,
Pearson
correlation
Redundancy
analysis
showed
total
nitrogen
(TN),
phosphorus
(TP),
depth
(WD),
temperature
(WT)
environmental
factors
influencing
structural
communities
different
patterns,
such
as
towns
lake,
increase
(N)
(P)
content
while
forests
distributed
lake
can
reduce
N
P
entering
which
is
probably
reason
for
difference
characteristics
Our
highlight
significantly
affects
by
bodies.
study
provide
guidance
pollution
control
management
