Acta Zoologica,
Journal Year:
2018,
Volume and Issue:
100(4), P. 359 - 364
Published: May 29, 2018
Abstract
Although
different
mechanisms
exist
to
explain
the
presence
of
polymorphism
in
lizards,
one
model
suggests
that
multiple
morphotypes
display
same
level
fitness.
Three
male
morphs
(grey,
yellow
and
orange)
coexist
Sceloporus
aeneus
,
a
Mexican
endemic
oviparous
lizard.
Using
histological
perspective,
we
test
hypothesis
spermatogenic
output
does
not
vary
across
S
.
during
its
maximum
testicular
activity.
Males
(five
grey,
five
were
collected
Calimaya,
Estado
de
México,
Mexico.
Snout‐vent
length
(
SVL
),
testis
mass,
diameter
epithelial
heights
for
seminiferous
tubules
epididymis,
number
layers
germ
cells
did
among
morphs;
moreover,
according
principal
component
analysis,
high
overlap
lateral
colour
exists.
Our
results
suggest
strongly
have
output,
natural
selection
may
be
stronger
driving
force
than
sexual
within
this
species.
Further
studies
into
other
lizard
species
with
are
required
determine
whether
lack
variation
observed
is
consistent
polymorphic
which
will
provide
greater
understanding
selective
acting
on
an
individual’s
Acta Zoológica Lilloana,
Journal Year:
2020,
Volume and Issue:
unknown, P. 84 - 115
Published: Dec. 3, 2020
Anuran
amphibians
show
the
largest
diversity
of
amphibian
reproductive
modes,
many
which
imply
egg
deposition
out
water.
This
kind
requires
specialisations
to
avoid
desiccation.
Physiological,
anatomical
and
ethological
traits
integrate
define
these
modes.
In
particular,
morphological
features
urogenital
system
correlate
with
modes
environmental
conditions
where
egg-laying
occurs.
this
study,
we
describe
testicular
histology
spermatogenesis
nest
building
frog
Leptodactylus
latinasus,
compare
it
other
species
that
breed
We
found
variations
in
tes
tis
size,
thickness
interstitial
tissue,
tunica
albuginea,
peritubular
tunics,
flagellum
length,
shape
size
spermatozoal
nucleus.
Certain
specifics’
characters
differed
at
level,
but
not
between
families.
Such
variation
could
be
an
indicator
performance
constraints
under
fertilisation
takes
place.
Copeia,
Journal Year:
2020,
Volume and Issue:
108(3)
Published: Sept. 22, 2020
Reproductive
physiology
is
influenced
by
environmental
pressures,
particularly
in
ectothermic
species
living
harsh
climatic
conditions.
Studying
the
period
of
time
which
males
exhibit
semen
availability
and
their
sperm
traits
constitutes
a
powerful
tool
to
evaluate
fertility
potential
because
size
velocity
have
been
proposed
as
determinants
fertilization
success.
Pristidactylus
achalensis
lizard
endemic
highest
mountain
areas
Central
Argentina
shows
pattern
seasonal
activity.
Here,
we
study
when
possess
during
active
season
characterize
spermatozoa
based
on
morphometric
dynamic
among
within
ejaculate.
Males
ejaculates
only
spring
months
season,
suggesting
that
reproductive
activity
restricted
this
time.
Spermatozoa
show
intra-specific
variation
ejaculate,
different
males.
Since
occupies
mountains
categorized
vulnerable,
basic
information
about
reproduction
could
be
useful
for
population
conservation
strategies.
Behavioral Ecology,
Journal Year:
2018,
Volume and Issue:
unknown
Published: July 23, 2018
Dominance
over
rivals,
sexual
attractiveness,
and
highly
efficient
ejaculates
are
3
important
contributors
of
male
fertilization
success
but
theories
about
how
primary
secondary
characters
may
co-evolve
largely
remain
to
be
tested.
We
investigated
variation
in
a
signal
(forehead
patch
size)
sperm
morphology
jointly
affected
siring
70
males
natural
population
collared
flycatchers.
show
that
the
optimal
length
attain
high
relative
depended
on
size
male's
character.
Males
with
small
forehead
patches
sired
more
offspring
their
nest
when
they
produced
long
vice-versa.
These
results
not
compatible
based
simple
relationships
between
display
traits
"quality"
imply
strategy
(and
hence
traits)
differs
even
predominantly
socially
monogamous
moderate
extra-pair
paternity
rates.
Thus,
better
knowledge
complex
chain
behavioural
interactions
sexes
gametes
is
needed
for
complete
understanding
selection
operates
nature.
Acta Zoologica,
Journal Year:
2018,
Volume and Issue:
100(4), P. 359 - 364
Published: May 29, 2018
Abstract
Although
different
mechanisms
exist
to
explain
the
presence
of
polymorphism
in
lizards,
one
model
suggests
that
multiple
morphotypes
display
same
level
fitness.
Three
male
morphs
(grey,
yellow
and
orange)
coexist
Sceloporus
aeneus
,
a
Mexican
endemic
oviparous
lizard.
Using
histological
perspective,
we
test
hypothesis
spermatogenic
output
does
not
vary
across
S
.
during
its
maximum
testicular
activity.
Males
(five
grey,
five
were
collected
Calimaya,
Estado
de
México,
Mexico.
Snout‐vent
length
(
SVL
),
testis
mass,
diameter
epithelial
heights
for
seminiferous
tubules
epididymis,
number
layers
germ
cells
did
among
morphs;
moreover,
according
principal
component
analysis,
high
overlap
lateral
colour
exists.
Our
results
suggest
strongly
have
output,
natural
selection
may
be
stronger
driving
force
than
sexual
within
this
species.
Further
studies
into
other
lizard
species
with
are
required
determine
whether
lack
variation
observed
is
consistent
polymorphic
which
will
provide
greater
understanding
selective
acting
on
an
individual’s
