Did shell-crushing predators drive the evolution of ammonoid septal shape?
Paleobiology,
Год журнала:
2021,
Номер
47(4), С. 666 - 679
Опубликована: Апрель 13, 2021
Abstract
For
centuries,
paleontologists
have
sought
functional
explanations
for
the
uniquely
complex
internal
walls
(septa)
of
ammonoids,
extinct
shelled
cephalopods.
Ammonoid
septa
developed
increasingly
fractal
margins,
unlike
any
modern
shell
morphologies,
throughout
more
than
300
million
years
evolution.
Some
suggested
these
morphologies
provided
increased
resistance
to
shell-crushing
predators.
We
perform
first
physical
compression
experiments
on
model
ammonoid
using
controlled,
theoretical
generated
by
computer-aided
design
and
3D
printing.
These
biomechanical
reveal
that
increasing
complexity
septal
margins
does
not
increase
resistance.
Our
results
raise
question
whether
evolution
shape
may
be
tied
closely
placement
siphuncle
foramen
(anatomic
hole).
tests
demonstrate
weakness
in
centers
uniformly
thick
septa,
supporting
work
suggesting
reinforcement
thickening
at
center
septa.
highlight
importance
reconstruction
idealized
permit
testing
long-held
hypotheses
evolutionary
drivers
recreating
once
rendered
physically
untestable
fossil
record.
Язык: Английский
Ocean acidification will not affect the shell strength of juveniles of the commercial clam species Chamelea gallina: implications of the local alkalinization of seawater.
Marine Environmental Research,
Год журнала:
2024,
Номер
202, С. 106746 - 106746
Опубликована: Сен. 11, 2024
Язык: Английский
Testing for allocation strategies and evolutionary tradeoffs in the bivalve shell
Journal of Molluscan Studies,
Год журнала:
2024,
Номер
90(4)
Опубликована: Сен. 23, 2024
ABSTRACT
Tradeoffs
are
a
fundamental
aspect
of
evolution,
such
that
organismal
morphologies
often
reflect
combination
developmental
constraints
and
functional
requirements.
The
net
result
is
striking
variety
allocation
strategies—where
how
resources
shunted
into
aspects
the
body
plan
to
meet
these
competing
demands.
bivalve
shell
records
animal's
strategies
as
relative
investment
in
carbonate
valves
internal
soft
parts,
generally
reflected
by
volume
cavity.
can
be
further
partitioned
among
different
components
shell,
including
sculptural
elements
thought
evolve
partly
under
ecological
controls.
Assuming
there
general
limits
energy
acquisition,
individuals
may
show
allocations
between
volumes
inner
cavity
possibly
for
sculpture.
Using
3D
scans
385
representing
339
extant
marine
species
occurring
Florida
Keys,
USA,
we
find
but
tradeoffs
construction
uncommon.
Instead,
with
relatively
high
their
thickness
also
have
prominent
sculpture,
suggesting
structural
relationship.
Neither
outer
mineralogy
nor
microstructure
appears
partition
tradeoff
space,
varied
pathways
fabrication
both
convergent
divergent
forms.
Framing
new
morphological
physiological
analyses
bivalves
recorded
well-fossilized
shells
opens
opportunities
understanding
an
under-studied,
macroevolutionary
dynamic:
shaped
class's
500
million-year
evolutionary
history.
Язык: Английский
Morphometric study of Lola Rochia nilotica (Linnaeus 1767) shells from natural harvest found in Indonesian
Biodiversitas Journal of Biological Diversity,
Год журнала:
2023,
Номер
24(9)
Опубликована: Окт. 1, 2023
Abstract.
Wahyudi
ND,
Hidayati
D,
Arbi
UY,
Ismail
A.
2023.
Morphometric
study
of
Lola
Rochia
nilotica
(Linnaeus
1767)
shells
from
natural
harvest
found
in
Indonesian.
Biodiversitas
24:
4711-4722.
The
population
or
snails
is
declining
due
to
shell
exploitation
for
industry,
which
requires
monitoring.
government
has
implemented
a
policy
determine
R.
regulated
on
restricted
basis
depending
the
number
(quota)
and
size
(diameter)
with
standard
width
80
cm.
Based
morphometric
compositions
trends
shells,
this
aimed
map
potential
trade
Indonesia
using
percentage
calculated
data,
including
Sumatra,
Sulawesi,
Maluku-East
Nusa
Tenggara
(NTT),
Papua.
analysis
was
carried
out
caliper
parameters
length,
width,
weight,
data
distribution
morphometrics
descriptive
statistics.
results
revealed
fluctuating
yearly
data.
Good
quality
(?80
mm)
Sumatra
(length
=
95.13-104.49
mm;
86.61-103.46
weight
172.21-321.96
gram),
Malulu-East
(NTT)
91.26-106.72
86.53-108.73
228.01-365.62
Sulawesi
86.92-99.1
84.31-96.25
205.39-317.33
Papua
82.46-99.58
76.49-101.24
182.57-283.07
gram)
respectively.
Among
909
samples
observed,
89%
had
(?80mm),
indicating
mapping
(33%),
(24%),
(18%),
(14%).
In
(1.65%),
(0.9%),
(5.6%),
(3.19%),
non-standard
were
sized
at
51.46-72.15
mm,
total,
53.9%
protoconchs
classified
as
damaged.
From
2014-2020,
morphological
observations
traded
fluctuated
but
met
size.
It
critical
continue
monitoring
nilotica,
findings
can
be
used
make
catch
quota
recommendations
Ministry
Environment
Forestry.
Язык: Английский
Vulnerability in Antarctic limpets: ready for an invasion of shell-crushing predators?
Biological Invasions,
Год журнала:
2022,
Номер
24(9), С. 2795 - 2808
Опубликована: Май 11, 2022
Язык: Английский
Exploring the predation of large land snails using preyed shell remains from rock anvil sites in a tropical limestone rainforest in Malaysia
Biodiversity Data Journal,
Год журнала:
2022,
Номер
10
Опубликована: Сен. 30, 2022
The
study
of
prey-predator
interactions
between
land
snails
and
birds
offers
important
insights
into
evolutionary
ecological
relationships.
Here,
we
report
a
case
rock
anvils
presumably
used
by
the
Myophonuscaeruleus
Enicurusruficapillus
in
cave
cavity
limestone
hill
Malaysia.
We
did
not
detect
any
other
species
plots
and,
therefore,
based
on
our
short
duration,
cannot
rule
out
possibility
that
species,
such
as
mammals,
preyed
snails.
predated
shell
remains
four
namely,
Hemiplecta
sp.,
Cyclophorusperdixperdix,
Amphidromusatricallosusperakensis
Cyclophorussemisulcatus,
were
found
around
nine
plots.
Finally,
discussed
potential
limitations
using
for
behavioural,
studies
their
predators.
Язык: Английский
Geology constrains biomineralization expression and functional trait distribution in the Mountainsnails
Journal of Biogeography,
Год журнала:
2023,
Номер
50(12), С. 2122 - 2134
Опубликована: Сен. 15, 2023
Abstract
Aim
Geographic
variation
in
metabolic
resources
necessary
for
functional
trait
expression
can
set
limits
on
species
distributions.
For
that
need
to
produce
and
maintain
biomineralized
traits
survival,
spatial
mineral
macronutrients
may
constrain
distributions
by
limiting
the
of
traits.
Here,
we
examine
whether
Oreohelix
land
snails
express
heavily
shell
ornaments
are
restricted
CaCO
3
rock
regions,
if
they
incorporate
greater
amounts
carbon
their
than
less
smooth
forms,
ornamentation
increases
strength.
Location
Western
United
States.
Taxon
snails.
Methods
We
used
random
forest
classification
models
at
multiple
resolutions
evaluate
contribution
topographic,
vegetation,
climate,
geologic
variables
predicting
presence
across
range
.
then
measured
compared
biometric
variables,
14
C/
12
C
ratios,
peak
force
fracture
ornamented
forms
from
calcareous
non‐calcareous
substrates.
Results
Distance
was
most
important
variable
all
closer
proximity
associated
with
probability
local
classification.
Pairwise
comparisons
ratios
closely
occurring
vs.
population
pairs
revealed
forms.
Ornamented
types
this
study
were
generally
heavier
required
except
when
comparing
sampled
rock.
Main
Conclusions
Biomineralization
expression,
distribution,
function
appear
be
constrained
supply
a
highly
diverse
group
This
trait‐environment
relationship
provides
basis
future
investigations
macronutrient
constraints
form
distribution
other
terrestrial
molluscs
has
direct
impact
management
species.
Язык: Английский
A GEOMETRIC AND MECHANICAL ANALYSIS OF REAL SHAPED BI-VALVE SHELL BY USING X-RAY COMPUTED TOMOGRAPHY IMAGES
Journal of Structural and Construction Engineering (Transactions of AIJ),
Год журнала:
2022,
Номер
87(795), С. 445 - 453
Опубликована: Апрель 30, 2022
The
biomimetics
has
been
applied
in
many
fields
while
its
application
structural
engineering
not
fully
promoted.
applicability
of
bi-valve
shells
to
spatial
structures
have
investigated,
however,
the
usefulness
shell
is
revealed.
This
because
mechanical
and
geometric
properties
are
understood
due
complex
shape.
In
this
study,
a
novel
method
for
measuring
real
shaped
by
using
X-ray
CT
images
proposed.
Thickness
curvature,
stress
evaluation
on
dead
load
analyzed
model
created
images.
Язык: Английский