Assessing variation in faecal glucocorticoid concentrations in gray whales exposed to anthropogenic stressors
Conservation Physiology,
Год журнала:
2023,
Номер
11(1)
Опубликована: Янв. 1, 2023
Understanding
how
individual
animals
respond
to
stressors
behaviourally
and
physiologically
is
a
critical
step
towards
quantifying
long-term
population
consequences
informing
management
efforts.
Glucocorticoid
(GC)
metabolite
accumulation
in
various
matrices
provides
an
integrated
measure
of
adrenal
activation
baleen
whales
could
thus
be
used
investigate
physiological
changes
following
exposure
stressors.
In
this
study,
we
measured
GC
concentrations
faecal
samples
Pacific
Coast
Feeding
Group
(PCFG)
gray
(Eschrichtius
robustus)
collected
over
seven
consecutive
years
assess
the
association
between
content
metrics
sound
levels
vessel
traffic
at
different
temporal
scales,
while
controlling
for
contextual
variables
such
as
sex,
reproductive
status,
age,
body
condition,
year,
time
year
location.
We
develop
Bayesian
Generalized
Additive
Modelling
approach
that
accommodates
many
complexities
these
data,
including
non-linear
variation
hormone
concentrations,
missing
covariate
values,
repeated
samples,
sampling
variability
some
below
limit
detection.
Estimated
relationships
showed
large
variability,
but
emerging
patterns
indicate
strong
context-dependency
variation,
depending
on
condition
proximity
port.
Our
results
highlight
need
control
baseline
related
context,
which
otherwise
can
obscure
functional
relationship
GCs
stressor
exposure.
Therefore,
extensive
data
collection
determine
sources
well-studied
populations,
PCFG
whales,
shed
light
cetacean
stress
physiology
extend
applicability
less-well-studied
taxa.
analyses
may
offer
greatest
utility
when
employed
part
suite
markers
that,
aggregate,
provide
multivariate
better
estimates
individuals'
health
ultimately
anthropogenic
populations.
Язык: Английский
Innovations and insights in environmental monitoring and assessment in port areas
Current Opinion in Environmental Sustainability,
Год журнала:
2024,
Номер
70, С. 101472 - 101472
Опубликована: Авг. 24, 2024
Язык: Английский
The (im)practicalities of water: Models, movement, and volume
Elsevier eBooks,
Год журнала:
2025,
Номер
unknown, С. 103 - 143
Опубликована: Янв. 1, 2025
Язык: Английский
Hydroacoustic Signals Recorded by CTBTO Network Suggest a Possible Submarine Landslide in Trou Sans Fond Canyon, Offshore Ivory Coast, March 2024
Seismological Research Letters,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 26, 2025
Abstract
Underwater
communication
cables
are
essential
components
of
global
infrastructure,
carrying
over
99%
international
data
traffic.
On
14
March
2024,
a
significant
disruption
to
this
network
occurred
because
cable
break
offshore
Ivory
Coast,
leading
widespread
internet
outages
in
the
West
African
region.
To
investigate
cause
break,
we
analyze
hydroacoustic
recorded
between
6
and
22
on
two
hydrophone
triads
installed
near
Ascension
Island
by
International
Monitoring
System
Comprehensive
Nuclear-Test-Ban
Treaty
Organization.
We
detect
low-frequency
(<60
Hz)
signal
three
northern
southern
triad
hydrophones
12
2024.
The
had
duration
85
s
north
compared
45
south
triad.
used
generalized
cross
correlation
with
phase
transform
method
show
that
detected
originated
at
bearing
38.9°
±
4.6°,
consistent
location
off
steep
bathymetric
slopes
mapped
Trou
Sans
Fond
Canyon.
do
not
observe
associated
signals
nearby
land-based
seismic
stations
Ghana
confirming
marine
origin
event.
In
addition,
template
matching
shows
same
was
preceding
following
eight
days,
implying
event
an
isolated
case.
Given
scarcity
natural
earthquakes
combination
evidence
suggests
likely
caused
submarine
landslide
Our
results
investigation
causative
events
is
also
needed
realize
potential
these
methods
for
hazard
risk
assessment
mitigation.
Язык: Английский
Autonomous wave gliders as a tool to characterize delphinid habitats along the Florida Atlantic coast
PeerJ,
Год журнала:
2025,
Номер
13, С. e19204 - e19204
Опубликована: Апрель 4, 2025
As
climate
change
and
anthropogenic
activities
continue
to
impact
cetacean
species,
it
becomes
increasingly
urgent
efficiently
monitor
populations.
Continuing
technological
advances
enable
innovative
research
methodologies
which
broaden
monitoring
approaches.
In
our
study,
we
utilized
an
autonomous
wave
glider
equipped
with
acoustic
environmental
sensors
assess
delphinid
species
presence
on
the
east
Florida
shelf
compared
this
approach
traditional
marine
mammal
methods.
Acoustic
recordings
were
analyzed
detect
along
track
in
conjunction
subsurface
variables
such
as
temperature,
salinity,
current
velocity,
chlorophyll-a
concentration.
Additionally,
occurrences
of
soniferous
fish
noise
also
documented.
These
in-situ
incorporated
into
generalized
additive
models
(GAMs)
identify
predictors
presence.
The
top-performing
GAM
found
that
location,
sound
pressure
level
(SPL),
concentration
explained
50.8%
deviance
dataset.
use
satellite
absence
derived
speed
heading,
44.8%
Our
reveals
explanatory
power
variables,
measurable
platforms
gliders,
drivers
habitat
characterization.
Язык: Английский
Bayesian Estimation of Individual Gray Whale Space Use Reveals Differential Exposure to Stressors
Ecology and Evolution,
Год журнала:
2025,
Номер
15(5)
Опубликована: Май 1, 2025
This
study
quantifies
the
individual
space
use
patterns
of
Pacific
Coast
Feeding
Group
gray
whales
(Eschrichtius
robustus)
from
photographic
capture-recapture
data,
collected
in
central
Oregon,
U.S.A.,
within
a
Bayesian
framework.
We
evaluate
potential
exposure
individuals
to
six
anthropogenic
stressors
given
their
patterns.
used
an
8-year
dataset
spatially
explicit
encounter
histories
via
photo-identification
during
continuous
boat
surveys
inform
model
and
estimate
whales.
Space
estimates
were
combined
with
values
four
static
(distance
two
ports,
distance
effluent
discharge
site,
area
whale
watching)
dynamic
(commercial
Dungeness
crab
pots,
recreational
fishing)
or
proxies
relative
stressor
exposure.
The
influence
age
sex
on
was
assessed
post
hoc.
use,
thereby
exposure,
highly
variable
among
individuals,
both
between
years.
Some
displayed
remarkable
long-term
fine-spatial-scale
site
fidelity,
not
typically
documented
for
large
baleen
Juveniles
concentrate
distinct
that
is
proximal
port
center
watch
activity.
Exposure
across
years
heterogeneity
population
distribution,
underscoring
complexity
managing
wildlife
populations.
While
management
plans
need
be
implemented
at
level,
recognition
incorporation
intraspecific
variation
can
improve
regulation
efficacy
since
performance
has
relevant
consequences
health.
Язык: Английский
Anthropogenic disturbance affects calling and collective behaviour in corvid roosts
Philosophical Transactions of the Royal Society B Biological Sciences,
Год журнала:
2024,
Номер
379(1905)
Опубликована: Май 20, 2024
Acoustic
communication
plays
an
important
role
in
coordinating
group
dynamics
and
collective
movements
across
a
range
of
taxa.
However,
anthropogenic
disturbance
can
inhibit
the
production
or
reception
acoustic
signals.
Here,
we
investigate
effects
noise
light
pollution
on
calling
behaviour
wild
jackdaws
(
Corvus
monedula
),
highly
social
corvid
species
that
uses
vocalizations
to
coordinate
at
winter
roosting
sites.
Using
audio
video
monitoring
roosts
areas
with
differing
degrees
urbanization,
evaluate
influence
movements.
We
found
when
levels
background
were
higher,
took
longer
settle
following
arrival
roost
evening
also
called
more
during
night,
suggesting
human
may
cause
sleep
disruption.
High
overnight
were,
turn,
linked
disruption
vocal
consensus
decision-making
less
cohesive
departures
morning.
These
results
raise
possibility
that,
by
affecting
cognitive
perceptual
processes,
activities
interfere
animals’
ability
behaviour.
Understanding
links
between
disturbance,
communication,
cognition
must
be
research
priority
our
increasingly
urbanized
world.
This
article
is
part
theme
issue
‘The
power
sound:
unravelling
how
shapes
dynamics’.
Язык: Английский
Characterizing the underwater soundscape at the site of a proposed port in northeast Iceland
Marine Pollution Bulletin,
Год журнала:
2024,
Номер
209, С. 117072 - 117072
Опубликована: Окт. 10, 2024
Язык: Английский
Using accelerometry tags to quantify gray whale foraging behavior
Marine Mammal Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 29, 2024
Abstract
High‐resolution
tri‐axial
accelerometry
biologging
tags
have
quantitatively
described
behaviors
in
baleen
whale
species
that
forage
using
lunges
and
continuous
ram
filtration.
However,
detailed
quantitative
descriptions
of
foraging
do
not
exist
for
gray
whales,
a
unique
primarily
uses
benthic
suction
feeding
with
rolling
component.
We
deployed
cup
on
Pacific
Coast
Feeding
Group
(PCFG)
whales
to
quantify
behavior
at
the
broad
state
(dive)
tactic
(roll
event)
scales.
Hidden
Markov
models
were
used
describe
three
distinct
states
turn
angle,
dive
duration,
pseudotrack
tortuosity,
presence
roll
events
can
be
interpreted
as
forage,
search,
transit
behavior.
Classification
Regression
Tree
best
tactics
(headstands,
digs,
side
swims)
median
pitch,
depth
total
length
ratio,
absolute
value
roll.
On
average,
PCFG
spent
more
time
searching
performed
left‐rolled
shallower
depths
night
compared
during
day,
potentially
track
prey
above
them
water
column.
Describing
enables
examination
links
between
behavioral
budgets,
energetics,
physiological
impact
threats
facing
this
group.
Язык: Английский