Revisiting concepts of thermal physiology: understanding negative feedback and set‐point in mammals, birds, and lizards
Biological reviews/Biological reviews of the Cambridge Philosophical Society,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 6, 2025
Abstract
The
thermoregulatory
system
of
homeothermic
endotherms
operates
to
attain
thermal
equilibrium,
that
is
no
net
loss
or
gain
heat,
where
possible,
under
a
challenge,
and
not
set‐point
any
other
target
body
temperature.
concept
in
temperature
regulation
has
been
widely
misinterpreted,
resulting
such
confusion
some
thermoregulation
specialists
have
recommended
it
be
abandoned.
But
the
enjoyed
resurgence
different
domain,
lizard
microclimate
selection.
We
review
principles
homeotherms,
endorse
negative
feedback
with
independent
set‐points
for
individual
thermo‐effectors
as
its
core
mechanism,
address
misconceptions
about
set‐point.
also
explore
range
selection
conclude
there
substantial
convergence
between
thermo‐effectors,
thresholds.
In
neither
nor
unitary
appropriate.
problems
measuring
do
believe
should
abandoned
just
because
misinterpreted
by
users.
It
valid
concept,
identifying
threshold
temperatures
at
which
regulatory
will
activated,
aid
attaining
equilibrium.
Language: Английский
What does infrared thermography tell us about the evolutionary potential of heat tolerance in endotherms?
Evolution Letters,
Journal Year:
2025,
Volume and Issue:
9(2), P. 184 - 188
Published: Jan. 2, 2025
Abstract
Anthropogenic
climate
change
affects
wild
animal
populations
through
increasing
average
temperatures
and
more
frequent
extreme
climatic
events.
Endotherms
have
evolved
the
capacity
to
regulate
their
body
temperature
but
little
is
still
known
about
how
they
can
physiologically
adapt
pace
of
global
warming.
Adaptive
responses
would
require
that
heat-tolerance
mechanisms,
such
as
withstand
high
evaporative
water
loss,
exhibit
sufficient
heritable
genetic
variation
for
selection
act
upon.
Unfortunately,
quantitative
genetics
these
traits
in
endotherms
remains
poorly
understood.
In
a
recent
study
using
infrared
thermography
(IRT)
on
semi-captive
ostriches,
Svensson
et
al.,
(Heritable
thermal
profiles
associated
with
reproductive
success
world’s
largest
bird.
Evolution
Letters,
8(2),
200–211.)
sought
address
this
knowledge
gap
by
measuring
relative
heat
exchange
from
head
neck
assessing
link
between
among-individual
dissipation
fitness.
We
discuss
IRT
serves
valuable
tool
non-invasive
data
collecting,
highlighting
its
potential
field
studies
evolutionary
tolerance.
Nevertheless,
interpreting
not
straightforward
it
may
seem
thus
must
be
conducted
carefully.
For
instance,
parts
which
surface
are
measured
need
unequivocally
identified
sources
dry
order
inform
thermoregulation—something
lacking
mentioned
study.
Furthermore,
there
no
conclusive
evidence
reflect
core
endotherms.
Critical
underlying
mechanisms
response,
cooling,
also
considered.
Assumptions
stemming
uncertain
proxies
thermoregulation
obscure
our
understanding
endothermic
adaptation
rapid
These
considerations
emphasize
that,
while
developing
approaches
estimate
tolerance
endotherms—particularly
species
most
vulnerable
warming,
application
warrants
careful
planning.
Language: Английский
Ten practical guidelines for microclimate research in terrestrial ecosystems
Methods in Ecology and Evolution,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 16, 2024
Abstract
Most
biodiversity
dynamics
and
ecosystem
processes
on
land
take
place
in
microclimates
that
are
decoupled
from
the
climate
as
measured
by
standardised
weather
stations
open,
unshaded
locations.
As
a
result,
microclimate
monitoring
is
increasingly
being
integrated
many
studies
ecology
evolution.
Overviews
of
protocols
measurement
methods
related
to
needed,
especially
for
those
starting
field
achieve
more
generality
standardisation
studies.
Here,
we
present
10
practical
guidelines
ground‐based
research
terrestrial
microclimates,
covering
best
practices
initial
conceptualisation
study
data
analyses.
Our
encompass
significance
microclimates;
specifics
what,
where,
when
how
measure
them;
design
studies;
optimal
approaches
analysing
sharing
future
use
collaborations.
The
paper
structured
chronological
guide,
leading
reader
through
each
step
necessary
conduct
comprehensive
study.
At
end,
also
discuss
further
avenues
development
this
field.
With
these
monitoring,
hope
stimulate
advance
evolution,
under
pressing
need
account
buffering
or
amplifying
abilities
contrasting
microhabitats
context
global
change.
Language: Английский
Should we really predict the response of wild endotherms to climate change based on thermal responses measured in captivity?
Published: Aug. 7, 2024
In
their
recent
study,
Beaman
et
al.
[1]
measured
the
metabolic
response
of
most
Language: Английский
Mind the polar sun: Solar radiations trigger frequent heat stress in breeding king penguins, despite relatively cool air temperatures.
bioRxiv (Cold Spring Harbor Laboratory),
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 13, 2024
Polar
and
sub-polar
animals
evolved
to
thrive
in
cold
climates
may
thus
be
particularly
vulnerable
the
rising
temperatures
associated
with
climate
change.
penguins
especially
due
their
dual
habitat,
alternating
between
foraging
waters
breeding/moulting
on
an
increasingly
warm
land.
Here,
we
characterized
heat
stress
occurrence
breeding
king
through
behavioural
observations
subcutaneous
body
temperature
measurements.
We
show
that
is
frequent
(>
20%
of
at
mid-day)
sub-Antarctic
region,
thermoregulatory
mechanisms
appear
insufficient
maintain
stable
sub-cutaneous
temperature.
Air
alone
was
a
poor
predictor
occurrence,
while
combination
high
solar
radiations,
low
wind
speed
its
best
predictor.
Importantly,
reproductive
failure
occurred
days
warmer
than
average,
suggesting
potential
significant
sublethal
effects
being
likely
affect
population
dynamics.
Language: Английский