Cool-edge populations of the kelp Ecklonia radiata under global ocean change scenarios: strong sensitivity to ocean warming but little effect of ocean acidification
Proceedings of the Royal Society B Biological Sciences,
Journal Year:
2024,
Volume and Issue:
291(2015)
Published: Jan. 17, 2024
Kelp
forests
are
threatened
by
ocean
warming,
yet
effects
of
co-occurring
drivers
such
as
CO
2
rarely
considered
when
predicting
their
performance
in
the
future.
In
Australia,
kelp
Ecklonia
radiata
forms
extensive
across
seawater
temperatures
approximately
7–26°C.
Cool-edge
populations
typically
more
thermally
tolerant
than
warm-edge
counterparts
but
this
ignores
possibility
local
adaptation.
Moreover,
it
is
unknown
whether
elevated
can
mitigate
negative
warming.
To
identify
could
improve
thermal
a
cool-edge
population
E.
,
we
constructed
curves
for
growth
and
photosynthesis,
under
both
current
(approx.
400
1000
µatm).
We
then
modelled
annual
warming
scenarios
to
highlight
susceptibility.
Elevated
had
minimal
effect
on
increased
photosynthesis
around
optimum.
Thermal
optima
were
16°C
18°C
indicated
may
be
vulnerable
Our
findings
demonstrate
that
unlikely
offset
potential
susceptibility
Language: Английский
Moderate ocean alkalinity enhancement likely to have minimal effects on a habitat‐forming kelp across multiple life stages
Limnology and Oceanography,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 18, 2025
Abstract
Ocean
alkalinity
enhancement
(OAE)
is
a
widely
considered
marine
CO
2
removal
method.
works
by
converting
seawater
into
and
electrochemical
methods
or
the
addition
of
alkaline
minerals.
Although
OAE
does
not
require
biology
to
remove
,
perturbations
caused
may
affect
organisms.
Due
logistical
challenges,
it
likely
that
additions
will
occur
in
coastal
regions,
yet
effects
on
species
are
unknown.
Along
temperate
coasts,
kelp
forests
important
communities
provide
habitat
for
numerous
species.
However,
unclear
how
kelps
respond
whether
responses
differ
across
life
stages.
To
address
this,
we
conducted
laboratory
culture
experiment
adults
Ecklonia
radiata
.
Individuals
were
exposed
control,
+300,
+600
μ
mol
kg
−1
using
NaOH
as
an
source.
Following
spores
from
reproductive
cultured
under
control
treatments
released
conditions
determine
effect
development
new
recruits.
Negative
only
evident
extreme
both
Adults
displayed
decline
growth
rates
treatment
less
recruits
developed
conditions.
No
negative
detected
+300
increases
These
findings
suggest
chemical
unlikely
have
substantial
impacts
E.
except
Language: Английский
A historical review of giant kelp harvesting in Tasmania
Journal of Phycology,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 18, 2025
Abstract
Kelps
have
a
long
history
of
human
use
and
exploitation.
Knowledge
past
harvesting
practices
offers
insights
into
environmental
baselines
the
contemporary
management
conservation
these
critically
important
ecosystems.
In
Tasmania,
Australia,
giant
kelp
(
Macrocystis
pyrifera
)
was
commercially
harvested
for
alginate
production
from
1964
to
1973,
but
those
forests
since
undergone
precipitous
declines
due
primarily
climate
change.
We
reviewed
collection
archival
data
sources
describe
history,
methods,
scale
this
understudied
largely
forgotten
industry.
calculated
that
>65,000
tonnes
(wet
weight)
were
eastern
Tasmania
over
decade
(mean
annual
harvest
=
6531
t),
making
it
one
largest
wild
industries
ever
exist
in
region.
However,
industry
had
challenges
finding
sufficient
biomass
sustain
operations,
ultimately
driving
its
closure
less
than
decade.
Feasibility
surveys
prior
suggested
much
greater
availability
realized,
perhaps
motivating
overexpansion.
Against
backdrop
change
ocean
warming
hotspot,
efforts
grew
wider
more
intensive,
during
summer
months
when
stocks
lowest,
almost
all
exploitable
harvested.
It
remains
unclear
whether
contributed
decline
Tasmanian
forests,
may
reduced
their
resilience
exacerbated
other
stressors,
particularly
heavily
areas.
This
historical
review
provides
rare
opportunity
examine
now‐endangered
also
help
inform
seaweed
resources.
Language: Английский
The endemic kelp Lessonia corrugata is being pushed above its thermal limits in an ocean warming hotspot
Journal of Phycology,
Journal Year:
2024,
Volume and Issue:
60(2), P. 503 - 516
Published: March 1, 2024
Abstract
Kelps
are
in
global
decline
due
to
climate
change,
which
includes
ocean
warming.
To
identify
vulnerable
species,
we
need
their
tolerances
increasing
temperatures
and
determine
whether
altered
by
co‐occurring
drivers
such
as
inorganic
nutrient
levels.
This
is
particularly
important
for
those
species
with
restricted
distributions,
may
already
be
experiencing
thermal
stress.
tolerance
of
the
range‐restricted
kelp
Lessonia
corrugata
,
conducted
a
laboratory
experiment
on
juvenile
sporophytes
measure
performance
(growth,
photosynthesis)
across
its
range
(4–22°C).
We
determined
upper
limit
growth
photosynthesis
~22–23°C,
optimum
~16°C.
if
elevated
nitrogen
availability
could
enhance
tolerance,
compared
juveniles
under
low
(4.5
μmol
·
d
−1
)
high
(90
nitrate
conditions
at
above
(16–23.5°C).
Nitrate
enrichment
did
not
but
lead
rates
optimum.
Our
results
indicate
L.
likely
extremely
susceptible
moderate
warming
marine
heatwaves.
Peak
sea
surface
during
summer
eastern
northeastern
Tasmania
can
reach
up
20–21°C,
projections
suggest
that
corrugata's
will
regularly
exceeded
2050
southeastern
Australia
ocean‐warming
hotspot.
By
identifying
have
taken
critical
step
predicting
future
climate.
Language: Английский
Non-linear growth-temperature relationship leads to opposite responses to warming in cold versus warm populations
bioRxiv (Cold Spring Harbor Laboratory),
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 20, 2024
Abstract
Body
size
is
a
key
functional
trait
that
has
declined
in
many
biological
communities,
partly
due
to
changes
individual
growth
rates
response
climate
warming.
However,
our
understanding
of
responses
natural
ecosystems
limited
by
relatively
short
time
series
without
large
temperature
contrasts
and
unknown
levels
adaptation
local
temperatures
across
populations.
In
this
study,
we
collated
back-calculated
length-at-age
data
for
the
fish
Eurasian
perch
(
Perca
fluviatilis
)
from
10
populations
along
Baltic
Sea
coast
between
1953–2015
(142023
measurements).
We
fitted
individual-level
trajectories
using
von
Bertalanffy
equation,
reconstructed
generalized
additive
models
three
sources.
Leveraging
uniquely
contrast
change
artificial
heating,
then
estimated
population-specific
global
growth-temperature
relationships
Bayesian
mixed
models,
evaluated
if
they
conformed
adaption
or
not.
found
little
evidence
temperature-dependence
curves.
Instead,
curves
mapped
onto
curve,
resulting
body
increasing
with
warming
cold
but
decreasing
warm
Understanding
which
degree
effects
on
are
critical
generalizing
predictions
impacts
growth,
affecting
multiple
organisation
individuals
ecosystem
functioning.
Language: Английский
The effect of temperature on rates of dissolved organic carbon (DOC) release by the kelp Ecklonia radiata (phylum Ochrophyta): Implications for the future coastal ocean carbon cycle
Journal of Phycology,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 11, 2024
Dissolved
organic
carbon
(DOC)
released
by
macroalgae
is
an
intrinsic
component
of
the
coastal
ocean
cycle,
yet
knowledge
how
future
warming
may
influence
this
limited.
Temperature
one
primary
abiotic
regulators
macroalgal
physiology,
but
there
minimal
understanding
it
influences
magnitude
and
mechanisms
DOC
release.
To
investigate
this,
we
examined
effect
a
range
temperatures
on
release
rates
physiological
traits
Ecklonia
radiata,
most
abundant
widespread
kelp
in
Australia
that
represents
potentially
significant
contribution
to
cycling.
Juvenile
sporophytes
were
incubated
at
eight
(4-28°C)
for
14
days,
after
which
time,
concentrations
(growth,
photosynthesis,
respiration,
F
Language: Английский