Postzygotic
isolation
in
the
form
of
reduced
viability
and/or
fertility
hybrids
may
help
maintain
species
boundaries
face
interspecific
gene
flow.
Past
hybridization
events
between
house
sparrows
(Passer
domesticus)
and
Spanish
(P.
hispaniolensis)
have
given
rise
to
a
homoploid
hybrid
species,
Italian
sparrow
italiae).
Although
genetic
incompatibilities
are
known
isolate
these
three
biological
consequences
still
unknown
early
generation
hybrids.
We
investigated
whether
F1
experience
or
fertility.
More
specifically,
we
generated
through
controlled
crosses
aviaries,
compared
ovaries
female
with
pure-species
sparrows.
found
that
overall,
were
underdeveloped
half
all
exhibited
symptoms
ovarian
hypofunction
(ovarian
atrophy
complete
absence
developed
follicles).
Fertility
is
common
consequence
post-zygotic
barriers
species.
discuss
results
light
previous
findings
on
parent
potential
role
speciation,
rare
evolutionary
process
birds.
Global
warming
is
affecting
biodiversity;
however,
the
extent
to
which
animal
reproductive
processes
respond
predicted
temperature
increments
remains
largely
unexplored.
The
thermal
environment
has
a
pronounced
impact
on
metabolic
rates
of
ectotherms;
therefore,
an
interesting
question
assess
whether
increase
might
affect
specific
mechanisms
like
sperm
performance
in
ectotherms.
Moreover,
many
species,
oviductal
fluid
(OF)
known
regulate
and
maintain
quality;
role
OF
relation
effects
high
unclear.
Our
aim
was
experimentally
test
effect
increased
velocity,
swimming
path
percentage
motility
neutral
conditions
at
ejaculation
(without
OF)
female's
tract
(with
OF),
social
ectotherm
lizard
model,
Tropidurus
spinulosus,
requirements
for
reproduction.
results
suggest
that
rising
associated
with
global
(+4°C)
affects
negatively
dynamics
survival.
However,
ameliorated
harmful
temperature.
This
important
point,
as
this
study
first
have
tested
preserving
from
warmer
pre-fertilization
environment.
These
contribute
our
understanding
how
changes
post-copulatory
mechanisms.
article
First
Person
interview
author
paper.
Journal of Evolutionary Biology,
Год журнала:
2022,
Номер
36(1), С. 131 - 143
Опубликована: Ноя. 10, 2022
Abstract
Sperm
cells
are
exceptionally
morphologically
diverse
across
taxa.
However,
morphology
can
be
quite
uniform
within
species,
particularly
for
species
where
females
copulate
with
many
males
per
reproductive
bout.
Strong
sexual
selection
in
these
promiscuous
is
widely
hypothesized
to
reduce
intraspecific
sperm
variation.
Conversely,
we
hypothesize
that
size
variation
may
maintained
by
high
among‐female
the
of
storage
organs,
assuming
paternity
success
improves
when
compatible
organ.
We
use
individual‐based
simulations
and
an
analytical
model
evaluate
how
on
depends
promiscuity
level
organ
(hereafter,
female
preference
variation).
Simulations
(10
mates
female)
showed
stabilizing
was
low,
disruptive
high,
consistent
results.
With
low
(2–3
female),
all
levels
simulations,
contrasting
model.
Promiscuity
level,
or
mate
sampling,
thus
has
a
strong
impact
resulting
from
preferences.
Furthermore,
male
traits
will
occur
under
much
more
limited
circumstances
(i.e.
only
higher
variation)
than
previous
models
suggest.
Variation
organs
likely
implications
highly
but
does
not
explain
differences
less
Ecology and Evolution,
Год журнала:
2021,
Номер
11(14), С. 9489 - 9497
Опубликована: Июнь 16, 2021
Abstract
The
saltmarsh
sparrow
Ammospiza
caudacuta
and
Nelson's
A.
nelsoni
differ
in
ecological
niche,
mating
behavior,
plumage,
but
they
hybridize
where
their
breeding
distributions
overlap.
In
this
advanced
hybrid
zone,
past
interbreeding
current
backcrossing
result
substantial
genomic
introgression
both
directions,
although
few
hybrids
are
currently
produced
most
locations.
However,
because
species
nonterritorial
have
only
brief
male–female
interactions,
it
is
difficult
to
determine
what
extent
assortative
explains
the
low
frequency
of
offspring.
Since
females
often
copulate
with
multiple
males,
a
role
sperm
as
postcopulatory
prezygotic
barrier
appears
plausible.
Here,
we
show
that
length
differs
between
two
among‐male
variation
consistent
strong
sexual
selection
on
cells.
We
hypothesize
divergence
may
constitute
reproductive
species,
co‐evolves
size
specialized
female
storage
tubules.
Sperm
does
not
appear
act
postzygotic
barrier,
from
was
unexceptional.
Research Square (Research Square),
Год журнала:
2024,
Номер
unknown
Опубликована: Март 4, 2024
Abstract
Cryptic
female
choice
is
a
component
of
postcopulatory
sexual
selection
that
allows
females
to
select
the
most
suitable
partner
fertilize
their
eggs.
While
its
precise
mechanisms
remain
unclear,
they
may
involve
influence
protein
composition
reproductive
fluids
on
sperm
functionality.
This
study
maps
cloacal
fluid
across
different
phases
cycle
in
sexually
promiscuous
passerine,
barn
swallow.
Similar
mammals,
tract
differed
between
receptive
(when
copulate)
and
nonreceptive
phases.
With
change
background,
enriched
gene
ontology
terms
also
shifted.
Within
phase,
distinctions
were
observed
proteomes
sampled
just
before
during
egg
laying.
However,
three
proteins
exhibited
increased
abundance
entire
phase
compared
These
can
be
considered
as
candidates
cryptic
choice,
all
them
functionality
or
sperm-egg
interaction.
Our
demonstrates
dynamic
changes
environment
throughout
avian
breeding
cycle,
emphasizing
importance
considering
these
fluctuations
studies
choice.
Scientific Reports,
Год журнала:
2024,
Номер
14(1)
Опубликована: Июнь 20, 2024
Abstract
Cryptic
female
choice
(CFC)
is
a
component
of
postcopulatory
sexual
selection
that
allows
females
to
influence
the
fertilization
success
sperm
from
different
males.
While
its
precise
mechanisms
remain
unclear,
they
may
involve
protein
composition
reproductive
fluids
on
functionality.
This
study
maps
cloacal
fluid
across
phases
cycle
in
sexually
promiscuous
passerine,
barn
swallow.
Similar
mammals,
tract
differed
between
receptive
(when
copulate)
and
nonreceptive
phases.
With
change
background,
enriched
gene
ontology
terms
also
shifted.
Within
phase,
distinctions
were
observed
proteomes
sampled
just
before
during
egg
laying.
However,
three
proteins
exhibited
increased
abundance
entire
phase
compared
These
are
candidates
cryptic
choice,
as
all
them
can
functionality
or
sperm-egg
interaction.
Our
demonstrates
dynamic
changes
environment
throughout
avian
breeding
cycle,
emphasizing
importance
considering
these
fluctuations
studies
choice.
bioRxiv (Cold Spring Harbor Laboratory),
Год журнала:
2022,
Номер
unknown
Опубликована: Авг. 5, 2022
Abstract
Sperm
cells
are
exceptionally
morphologically
diverse
across
taxa.
However,
morphology
can
be
quite
uniform
within
species,
particularly
for
species
where
females
copulate
with
many
males
per
reproductive
bout.
Strong
sexual
selection
in
these
promiscuous
is
widely
hypothesized
to
reduce
intraspecific
sperm
variation.
Conversely,
we
hypothesize
that
size
variation
may
maintained
by
high
among-female
the
of
storage
organs,
assuming
paternity
success
improves
when
compatible
organ.
We
use
individual-based
simulations
and
an
analytical
model
evaluate
how
on
depends
promiscuity
level
organ
(hereafter,
female
preference
variation).
Simulated
showed
stabilizing
was
low,
disruptive
high,
consistent
results.
With
low
(2-3
mates
female),
all
levels
simulations,
contrasting
model.
Promiscuity
level,
or
mate
sampling,
thus
has
a
strong
impact
resulting
from
preferences.
Further,
promiscuity,
male
traits
will
occur
under
more
limited
circumstances
than
previous
models
suggest.
Variation
organs
likely
implications
highly
but
does
not
explain
differences
less
