bioRxiv (Cold Spring Harbor Laboratory),
Journal Year:
2024,
Volume and Issue:
unknown
Published: Feb. 18, 2024
Insect
performance
is
intrinsically
linked
to
environmental
temperature,
and
surviving
through
winter
represents
a
key
challenge
for
temperate,
alpine,
polar
species.
To
overwinter,
insects
have
adapted
wide
range
of
strategies
become
truly
cold
hardy.
However,
while
the
physiological
mechanisms
underlying
ability
avoid
or
tolerate
freezing
been
well-studied,
little
attention
has
given
maintaining
ion
homeostasis
at
frigid
temperatures
in
these
species,
despite
this
being
central
issue
susceptible
mild
chilling.
Here
we
investigate
how
prolonged
exposure
just
above
supercooling
point
affects
balance
freeze-avoiding
larvae
mountain
pine
beetle
(Dendroctonus
ponderosae)
autumn,
mid-winter,
spring,
relate
it
organismal
recovery
times
survival
outcomes.
We
found
that
hemolymph
was
gradually
disrupted
during
first
day
exposure,
characterized
by
hyperkalemia
hyponatremia,
after
which
plateau
reached
maintained
rest
seven
experiment.
The
degree
ionoregulatory
collapse
experienced
correlated
strongly
with
times,
followed
similar
asymptotical
progression.
Mortality
increased
slightly
most
severe
exposures,
where
K+
concentration
highest,
logistic
relationship
between
hyperkalemia.
Thus,
tolerance
D.
ponderosae
appears
limited
prevent
manner
less
tolerant
chill-susceptible
insects,
albeit
much
lower
temperatures.
Furthermore,
posit
prerequisite
evolution
insect
freeze
avoidance
convergent
ancestral
maintain
extreme
stress.
Ecological Entomology,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 12, 2025
Abstract
All
species
exhibit
functional
senescence,
a
process
related
to
ageing
that
is
influenced
by
both
abiotic
and
biotic
factors.
Ageing
leads
decline
in
function
drives
phenotypic
marked
reduction
performance
over
time.
In
temperate
regions,
overwintering
must
survive
age
for
several
months,
often
facing
challenging
conditions
with
low
food
availability
chilling
injuries.
Yet,
might
enter
state
of
dormancy,
which
can
extend
longevity
enhance
stress
tolerance.
Evaluating
the
survivors
crucial
predicting
population
dynamics,
especially
significant
pests
like
invasive
fruit
flies.
At
end
winter,
surviving
fly
populations,
are
expected
rebuild
new
generations,
likely
dormant
(i.e.,
reproductive
quiescence)
senescent.
However,
their
has
not
been
thoroughly
described.
This
study
aims
decipher
effect
on
tolerance
capacity
males
females
summer‐acclimated
(SP)
versus
winter‐acclimated
(WP)
phenotypes
Drosophila
suzukii
.
SP
WP
flies
were
reared
under
normal
temperature
conditions,
respectively,
four
categories
established:
very
young,
middle
old.
showed
typical
age‐related
fecundity.
contrast,
cold‐acclimated
maintained
high
exhibited
lower
but
stable
potential,
despite
months
at
temperature.
Our
highlights
importance
distinguishing
between
summer
phenotypes,
as
differentially
affects
both.
Insects,
Journal Year:
2025,
Volume and Issue:
16(1), P. 54 - 54
Published: Jan. 8, 2025
Insect
diapause
and
response
to
thermal
stress
are
similar
in
the
variety
of
manifestations.
However,
influence
shocks
on
incidence
insect
has
not
been
sufficiently
studied.
Our
laboratory
experiments
showed
that
both
cold
(-10
°C)
heat
(43
experienced
for
at
least
20-30
min
significantly
reduced
facultative
larval
winter
egg
parasitoid
Trichogramma
telengai.
patterns
these
responses
were
substantially
different.
In
particular,
peaks
sensitivity
diapause-averting
effects
fell,
correspondingly,
middle-stage
(5
days
development
15
late-stage
(9-11
larvae.
Heat
mostly
via
changes
initial
proportions
diapause-destined
non-diapause-destined
individuals,
whereas
effect
is
based
differential
mortality
(i.e.,
difference
among
treatments
same
experiment)
with
better
survival
individuals.
These
results
elucidate
peculiarities
interaction
between
diapause,
allowing
us
specify
methods
mass
rearing
storage.
Agricultural and Forest Entomology,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 1, 2025
Abstract
The
local
population
dynamics
of
an
invasive
species
are
important
for
determining
proper
management.
Temporal
and
spatial
distribution
can
influence
monitoring
treatment
decisions,
understanding
climatic
influences
on
size
help
predict
peak
numbers.
Drosophila
suzukii
(Matsumara,
1931)
is
fruit
pest,
its
seasonal
vary
across
range.
We
conducted
a
three‐year
trapping
study
with
various
modelling
approaches
to
determine
the
environmental
variables
influencing
D.
all
seasons
in
Kentucky,
temperate
state
overwintering
.
Male
female
flies
were
active
seasons,
visiting
traps
located
ground
at
plant
height.
Most
caught
wooded
edge
habitat
crops
only
had
more
catches
than
forest
during
summer.
Population
was
best
predicted
by
general
additive
model
that
included
average
temperature
8
weeks
before
sampling
relative
humidity
two
sampling,
which
differs
from
other
models
have
extremely
low
as
most
predictive
weather
variable.
Our
results
indicate
factors
Kentucky
differ
those
higher
or
lower
latitudes.
recommend
leading
up
fruiting
pest
pressure.
Further,
our
suggest
optimal
time
monitor
when
temperatures
exceed
21°C.
Broadly,
findings
highlight
need
investigate
these
appropriate
scale
develop
region‐specific
management
recommendations.
Journal of Experimental Botany,
Journal Year:
2024,
Volume and Issue:
75(11), P. 3467 - 3482
Published: March 6, 2024
The
thermal
death
time
(TDT)
model
suggests
that
the
duration
for
which
an
organism
can
tolerate
stress
decreases
exponentially
as
intensity
of
temperature
becomes
more
extreme.
This
has
been
used
to
predict
damage
accumulation
in
ectothermic
animals
and
plants
under
fluctuating
conditions.
However,
critical
assumption
TDT
model,
is
additive
accumulation,
remains
unverified
plants.
We
assessed
Thymus
vulgaris
different
heat
cold
treatments,
models
failure
PSII.
Additionally,
tolerance
estimates
from
previous
studies
were
create
assess
applicability
this
framework
show
between
44
°C
47
-6.5
-8
°C,
at
both
extremes.
Data
indicate
a
broad
approach
across
plant
species
traits.
reveals
landscape
describing
relationship
exposure
duration,
intensity,
percentage
accumulation.
extreme
sensitivity
emphasizes
even
1
increase
future
temperatures
could
impact
their
mortality
distribution.
