Burrowing Constrains the Phenotypic Diversity of Fossorial Crayfish
Integrative and Comparative Biology,
Год журнала:
2024,
Номер
unknown
Опубликована: Июнь 11, 2024
Synopsis
Strong
selective
pressure
on
phenotype
can
arise
when
habitat
transitions
fundamentally
alter
the
physical
media
in
which
animals
live,
such
as
invasion
of
land
by
lobe-finned
fishes
and
insects.
When
environmental
gradients
differ
drastically
among
habitats
multiple
lineages
transition
between
these
habitats,
we
expect
phenotypic
convergence
to
be
prevalent.
One
where
widespread
has
been
observed
is
shift
from
aboveground
subterranean
environments
fossorial
animals.
Subterranean
are
low-light,
confined
spaces
tend
hypoxic
or
anoxic,
not
mention
that
act
burrowing
itself
demands
morphological
specializations
for
excavation.
Research
suggests
promotes
crayfish,
with
non-burrowing
forms
having
a
dorsoventrally
compressed
carapace
long,
slender
claws
(chelae),
while
primary
have
dorsolaterally
shorter,
more
powerful
claws.
However,
earlier
ecomorphological
comparisons
relied
qualitative
rather
than
quantitative
assessments
differences.
This
study
tested
North
American
crayfishes
using
geometric
morphometric
approach.
We
photographed
claw
representative
species
across
13
genera.
hypothesized
occur
similar
exhibit
behaviors,
would
converge
their
shapes.
found
evidence
morphologies
crayfishes.
phenotypes
did
strongly
shape,
an
example
“imperfect”
“incomplete”
attribute
competing
form
function.
argue
nuances
characteristics,
like
soil
type
compaction,
make
complete
unlikely
range-
dispersal-limited
Язык: Английский
Intrapopulation variability in coloration is associated with reproductive season in the crayfish Faxonius virilis
Current Zoology,
Год журнала:
2024,
Номер
71(2), С. 251 - 262
Опубликована: Авг. 30, 2024
Abstract
Animal
coloration
has
a
wide
range
of
biological
functions
and
may
be
subject
to
different,
sometimes
conflicting,
selective
pressures.
In
crustaceans,
the
evolution
is
relatively
unstudied,
despite
broad
colors
color
patterns,
which
includes
variability
at
multiple
levels.
Freshwater
crayfish
are
known
show
within
species
populations,
as
well
intra-individual
variability,
but
function,
if
any,
largely
unknown.
Here,
I
report
on
an
experiment
understand
patterns
in
Faxonius
virilis
that
variation
strongly
correlated
ontogenetic
changes
from
summer
non-reproductive
form
fall
reproductive
form.
Crayfish
showed
comparatively
little
inter-
their
form,
substantial
both
levels
Transition
was
associated
with
development
greener
or
bluer
localized
chelae
subset
individuals,
these
no
clear
correlation
sex
body
size.
Future
investigations
should
focus
determining
whether
differences
between
individuals
mating
season
any
physiological
behavioral
differences,
differential
susceptibility
predation.
Язык: Английский
Chela asymmetry and dimorphism in the red swamp crayfish <b><i>Procambarus clarkii</i></b> (Decapoda: Astacidea: Cambaridae)
Crustacean Research,
Год журнала:
2023,
Номер
52(0), С. 97 - 108
Опубликована: Дек. 8, 2023
The
red
swamp
crayfish
Procambarus
clarkii
exhibits
different
sexual
morphotypes
(reproductive
type,
form
I;
non-reproductive
II)
in
both
sexes
after
reaching
maturity.
This
species
shows
intra-
and
inter-sexual
dimorphisms
of
chela
size:
the
chelae
are
largest
I
males,
followed
by
females
II
smallest
females.
Chelipeds
this
asymmetrical,
with
one
being
larger
than
other.
However,
little
is
known
about
degree
asymmetry
P.
clarkii.
We
examined
further
elucidated
dimorphism.
Larger
occurred
randomly
on
either
right
or
left
sides.
size
differences
between
smaller
were
primarily
small,
some
individuals
had
regenerating
chelipeds.
Allometric
growth
analyses
revealed
shape,
males
exhibiting
slender
wide
chelae,
respectively.
Male
clarkii’s
may
function
as
useful
weapons,
whereas
female
large
also
tools
for
constructing
maintaining
deeper
burrows
breeding.
Язык: Английский