PLoS ONE,
Journal Year:
2024,
Volume and Issue:
19(12), P. e0310688 - e0310688
Published: Dec. 18, 2024
One
of
the
most
toxic
metals
is
mercury,
which
exhibits
high
toxicity
during
short
exposure
periods.
This
study
aimed
to
determine
concentration
total
mercury
(THg)
in
fish
muscle
tissue
from
various
species
captured
two
locations
middle
basin
Pastaza
River
Ecuador,
locals
use
their
weekly
diet.
The
individuals
belong
following
families:
Loricariidae,
Cetopsidae,
Heptapteridae,
Cichlidae,
Parodontidae,
Characidae,
Prochilodontidae,
Curimatida,
Siluriformes,
Cichliformes,
Characiformes,
Erythrinidae
and
Curimatidae.
Carnivorous
Charax
sp.
Cetopsis
plumbea
,
had
THg
concentrations
were
0.241±
0.018
0.116
±
0.045
mg
kg
-1
respectively.
Herbivorous
Hypostomus
a
lower
THg.
Hoplias
malabaricus
exhibited
0.160±0.033
0.020±0.007
for
omnivorous
Creagrutus
accumulated
higher
levels
Hg
compared
non-carnivorous
species.
Concentration
collected
did
not
exceed
maximum
permissible
limits
set
by
legislative
standards
(Ecuadorian
Institute
Standardization
(INEN
as
per
acronym
Spanish),
FAO/WHO
European
Commission);
objective
hazard
quotient
was
less
than
1,
indicating
that
consumption
this
may
pose
no
risk
human
health.
Considering
mean
methylmercury,
all
analysed,
results
daily
rate
between
6–199
g
29–928
children
adults,
Environmental Research,
Journal Year:
2023,
Volume and Issue:
236, P. 116759 - 116759
Published: July 27, 2023
Despite
being
one
of
the
most
important
tropical
biomes
in
world,
Atrato
River
basin
has
experienced
a
critical
ecological
deterioration
due
to
gold
mining,
posing
significant
threat
wildlife
and
human
health.
In
this
study,
we
measured
concentrations
mercury
(Hg)
arsenic
(As)
sediments
at
various
swamps
within
basin.
Classical
indices
were
employed
assess
associated
health
risks
linked
exposure
these
elements.
The
Hg
As
ranged
between
0.09
0.23
mg/kg
0.59–2.68
mg/kg,
respectively.
highest
values
found
upstream
stations
impacted
by
mining
activities.
For
As,
levels
near
river
mouth
(except
for
station
B),
where
agricultural
practices
are
taken
place.
contamination
factor
(CF)
indicated
that
exhibited
moderate
depending
on
specific
sampling
area.
Conversely,
contaminant
load
index
(PLI)
suggested
level
ranging
from
basic
with
exception
A,
which
showed
progressive
site.
geoaccumulation
(Igeo)
moderately
contaminated
Hg,
while
showing
signs
increasing
As.
According
criteria
limiting
effect
(TEC),
exceeded
TEC
B
C,
indicating
potential
toxic
risk
aquatic
biota.
A
(PERI)
was
detected
all
stations,
except
classified
as
strong.
hazard
(HI),
used
non-carcinogenic
assessment,
adverse
effects
population,
particularly
children,
HI
exceeding
1.
However,
lifetime
cancer
(TLCR)
fell
acceptable
range
(1
×
10−6
1
10−4),
negligible
risk.
Oral
ingestion
inhalation
identified
two
primary
routes
concern.
This
study
serves
valuable
reference
assessment
regarding
exposures
environmental
matrices
may
not
pose
an
immediate
Ecotoxicology and Environmental Safety,
Journal Year:
2025,
Volume and Issue:
292, P. 117953 - 117953
Published: March 1, 2025
In
South
Kivu
province,
Eastern
Democratic
Republic
of
Congo,
a
significant
number
active
mines
are
situated
near
strictly
protected
ecosystems,
where
adverse
effects
including
deforestation,
water
pollution,
soil
degradation
and
loss
biodiversity
have
been
documented.
Understanding
the
local
communities'
perceptions
how
mining
affects
fish
diversity
yield
is
crucial
for
fostering
harmonious
relationship
among
stakeholders
preserving
environment
its
biodiversity,
particularly
in
Mwenga
territory
activities
widespread.
This
study
aimed
to
establish
typology
fishers,
investigate
their
drivers
these
regarding
impact
operations
on
territory,
Congo.
A
cross-sectional
survey
involving
75
randomly
selected
fishers
was
conducted,
data
were
collected
through
structured
questionnaires.
Water
quality
parameters
measured
at
three
different
monitoring
sites
along
Zalya-Elila
River,
primary
watercourse
territory.
Principal
component
analysis
identified
two
distinct
groups
fishers.
Key
factors
influencing
included
age,
household
size,
monthly
income,
fishing
experience,
caught
daily
15
years
ago,
distance
between
river
mine
site,
hours
per
day,
weekly
frequency,
quantity
(weight)
day
currently
ago
(p
<
0.05).
proportion
(39.02
%)
surveyed
reported
decline
due
activities,
with
only
seven
out
13
previously
present
species
remaining
area.
Moreover,
average
catch
fisher
decreased
from
9.00
±
4.20
Kg
4.45
1.88
currently.
Various
influenced
fishers'
perceptions,
marital
status,
education
level,
comparison
current
past
catches,
presence
nearby
sites,
interconnections
bodies,
sediment
bodies
Among
11
monitored,
temperature,
dissolved
oxygen,
biological
oxygen
demand
over
five
days,
chlorite
concentration,
sulfate,
nitrate
met
acceptable
desirable
ranges
natural
ecosystems.
The
information
obtained
this
constitutes
prerequisite
developing
implementing
studies
or
policies
mitigating
combatting
negative
Actions
needed
authorities
ensure
sustainability
Microorganisms,
Journal Year:
2023,
Volume and Issue:
11(11), P. 2708 - 2708
Published: Nov. 4, 2023
In
this
study,
338
microorganisms,
comprising
271
bacteria
and
67
fungi,
were
isolated
from
sediment
samples
collected
underexplored
Pacific
Caribbean
regions
of
Colombia.
Screening
trials
conducted
on
selected
strains
(n
=
276)
to
assess
their
tolerance
cadmium
(Cd2+),
lead
(Pb2+),
zinc
(Zn2+),
leading
the
identification
six
capable
withstanding
750
mg·L−1
each
heavy
metal
ion.
Three
promising
identified
as
Enterobacter
sp.
INV
PRT213,
Pseudomonas
PRT215,
Stenotrophomonas
PRT216
for
removal
experiments
using
LB
broth
medium
supplemented
with
400
Pb2+.
Among
these,
PRT215
exhibited
significant
potential,
removing
49%
initial
Pb2+
after
240
min
exposure
(16.7
g
wet
biomass·L−1,
pH
5,
30
°C).
Infrared
spectra
Pb-exposed
biomass
showed
changes
in
functional
groups,
including
carbonyl
groups
amides,
carboxylate,
phosphate,
hydroxyl,
amine
compared
not-exposed
control.
These
suggested
interactions
between
biomass.
The
findings
study
highlight
potential
microorganisms
derived
coastal
marine
environments
candidates
future
applications
bioremediation
polluted
contaminated
metals.
Water,
Journal Year:
2024,
Volume and Issue:
16(9), P. 1199 - 1199
Published: April 23, 2024
Macrophytes
are
fundamental
photosynthetic
organisms
for
functioning
freshwater
ecosystems,
identified
as
potential
bioindicators
of
mercury
(Hg)
in
the
environment.
We
quantified
concentrations
total
Hg
(THg)
water
and
macrophytes
(Paspalum
repens
Berg.)
from
17
lakes
on
Araguaia
River
floodplain,
aiming
to
compare
bioconcentration
factor
(BCF)
aerial
tissues
roots;
evaluate
translocation
(TF)
between
plant
tissues;
assess
influence
environmental
factors
land
use
THg
macrophytes.
The
BCF
was
significantly
higher
roots
(1.29
±
0.32)
than
(0.41
0.34),
with
low
TF
(0.14
0.06).
highest
were
determined
intensity
a
pH
close
neutral,
indicating
transport
particulate-bound
immobilization
column.
In
contrast,
wetlands
priority
areas
macrophytes,
associated
sulfate,
dissolved
oxygen,
oxidation–reduction
water.
Thus,
although
P.
is
not
suitable
bioindicator
mobilization
by
anthropogenic
our
study
area,
results
suggest
sites
that
favorable
methylation.
In
South
Kivu
province,
Eastern
DR
Congo,
more
than
a
quarter
of
active
mines
are
located
nearby
strictly
protected
ecosystems,
where
negative
impacts
have
already
been
reported.
Understanding
how
local
communities
perceive
the
impact
mining
on
fish
diversity
and
yield
is
crucial
for
cultivating
harmonious
relationship
between
these
stakeholders.
This
knowledge
can
play
pivotal
role
in
preserving
environment
its
biodiversity,
particularly
Mwenga,
activities
prevalent.
study
aimed
to
establish
typology
fishers
investigate
their
perceptions
regarding
Mwenga
territory.
A
cross-sectional
survey
was
conducted,
involving
75
randomly
selected
fishers.
Data
were
gathered
through
structured
questionnaire,
water
quality
parameters
measured
at
three
different
monitoring
sites
along
Zalya-Elila
River,
primary
watercourse
Principal
component
analysis
identified
two
distinct
groups
fishermen.
Key
variables
influencing
fishermen
included
age,
household
size,
monthly
income,
fishing
experience,
number
caught
daily
15
years
ago,
distance
river
mine
site,
hours
per
day,
weekly
frequency,
quantity
day
currently
as
well
ago
(p<0.05).
significant
proportion
(39.02%)
surveyed
reported
decline
resulting
from
activities,
with
only
8
out
14
previously
present
(15
ago)
species
remaining
area.
Moreover,
average
catch
fisherman
has
decreased
9.00
±
4.20
Kg
4.45
1.88
currently.
Various
factors
found
influence
fishers,
including
marital
status,
level
education,
comparison
current
past
catches,
presence
sites,
sediments
bodies,
pollution,
interconnections
type
It
worth
mentioning
that
monitored
pH,
temperature,
dissolved
oxygen,
alkalinity
within
acceptable
desirable
ranges
natural
ecosystems.
Further
research
could
explore
groundwater,
sediments,
flora,
air.
Additionally,
efforts
should
focus
developing
promoting
community-centered
strategies
sustainable
practices
minimize
diversity,
quality,
livelihoods
