Hotter is not (always) better: Embracing unimodal scaling of biological rates with temperature
Ecology Letters,
Год журнала:
2024,
Номер
27(2)
Опубликована: Фев. 1, 2024
Rate-temperature
scaling
relationships
have
fascinated
biologists
for
nearly
two
centuries
and
are
increasingly
important
in
our
era
of
global
climate
change.
These
hypothesized
to
originate
from
the
temperature-dependent
kinetics
rate-limiting
biochemical
reactions
metabolism.
Several
prominent
theories
formalized
this
hypothesis
using
Arrhenius
model,
which
characterizes
a
monotonic
temperature
dependence
an
activation
energy
E.
However,
ubiquitous
unimodal
nature
biological
responses
presents
theoretical,
methodological,
conceptual
challenges
that
restrict
promise
insight,
prediction,
progress.
Here
we
review
development
key
hypotheses
methods
temperature-scaling
rates.
Using
simulations,
examine
constraints
models,
illustrating
their
sensitivity
data
nuances
such
as
range
noise,
tendency
yield
variable
underestimated
E,
with
critical
consequences
change
predictions.
We
also
evaluate
behaviour
models
when
applied
incomplete
noisy
datasets.
conclude
recommendations
resolving
these
future
research,
advocate
shift
better
characterize
full
responses.
Язык: Английский
Estimating CO2 response in a mixed broadleaf forest using the dynamic assimilation technique
BMC Plant Biology,
Год журнала:
2025,
Номер
25(1)
Опубликована: Янв. 21, 2025
Estimating
the
CO2
response
of
forest
trees
is
great
significance
in
plant
photosynthesis
research.
measurement
traditionally
employed
under
steady
state
conditions.
With
development
open-path
gas
exchange
systems,
Dynamic
Assimilation
Technique
(DAT),
allows
non-steady
This
greatly
improves
efficiency
and
data
density
measurement.
study
aims
to
assess
accuracy
effectiveness
different
models
fitting
DAT
data,
addressing
current
gap
verification
model
performance.
research
was
conducted
for
three
common
broadleaf
tree
species
(Ulmus
macrocarpa,
Fraxinus
mandshurica,
Tilia
amurensis)
North
Eastern
China.
Among
species,
mandshurica
most
adapted
high
concentration
Four
were
compared,
rectangular
hyperbola
(RH)
model,
Michaelis-Menten
(MM)
modified
(MRH)
a
non-rectangular
(NRH)
model.
Considering
parsimony
parameter
accuracy,
NRH
emerged
as
best
choice
(R2
=
0.9966,
RMSE
0.1862,
AIC=-199.86).
provides
reference
further
application
field
photosynthesis.
Язык: Английский
Estimating CO2 Response in a Mixed Broadleaf Forest using the Dynamic Assimilation Technique
Research Square (Research Square),
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 15, 2024
Abstract
Background
Estimating
the
CO
2
response
of
forest
trees
is
great
significance
in
plant
photosynthesis
research.
measurement
traditionally
employed
under
steady
state
conditions.
With
development
open-path
gas
exchange
systems,
Dynamic
Assimilation
Technique
(DAT),
allows
non-steady
This
greatly
improves
efficiency
and
data
density
measurement.
However,
effects
different
models
fitting
DAT
have
not
been
extensively
verified.
Results
research
was
conducted
for
three
common
broadleaf
tree
species
(
Ulmus
macrocarpa,
Fraxinus
mandshurica,
Tilia
amurensis)
North
Eastern
China.
Among
species,
Fraxinus
mandshurica
most
adapted
to
high
concentration
Four
were
compared,
rectangular
hyperbola
(RH)
model,
Michaelis-Menten
(MM)
modified
(MRH)
model
a
non-rectangular
(NRH)
model.
Conclusions
Considering
parsimony
parameter
accuracy,
NRH
emerged
as
best
choice
(R
2
=
0.9966,
RMSE
0.1862,
AIC=-199.86).
study
provides
reference
further
application
field
photosynthesis.
Язык: Английский
Acclimation Unifies the Scaling of Carbon Assimilation Across Climate Gradients and Levels of Organisation
Ecology Letters,
Год журнала:
2024,
Номер
27(10)
Опубликована: Окт. 1, 2024
ABSTRACT
The
temperature
dependence
of
carbon
assimilation—from
leaf
photosynthesis
to
ecosystem
productivity—is
hypothesised
be
driven
by
the
kinetics
Rubisco‐catalysed
carboxylation
and
electron
transport.
However,
photosynthetic
physiology
acclimates
changes
in
temperature,
which
may
decouple
dependencies
at
higher
levels
organisation
from
acute
sensitivity
photosynthesis.
Here,
we
integrate
relative
growth
rate
theory,
metabolic
theory
biochemical
develop
a
budget
model
plant
that
accounts
for
acclimation
temperature.
We
test
its
predictions
using
novel
experimental
approach
enabling
concurrent
measurement
photosynthesis,
acclimated
rate.
demonstrate
first
time
mediates
how
assimilation
‘scale
up’
whole‐plant
growth.
also
find
existing
models
are
unable
predict
features
responses
our
system.
Язык: Английский