The coevolutionary dynamics of cryptic female choice
Evolution Letters,
Journal Year:
2023,
Volume and Issue:
7(4), P. 191 - 202
Published: June 7, 2023
In
contrast
to
sexual
selection
on
traits
that
affect
interactions
between
the
sexes
before
mating,
little
theoretical
research
has
focused
coevolution
of
postmating
via
cryptic
female
choice
(when
females
bias
fertilization
toward
specific
males).
We
used
simulation
models
ask
(a)
whether
and,
if
so,
how
nondirectional
(female-by-male
in
success)
causes
deviations
from
focus
exclusively
male-mediated
processes,
and
(b)
risk
sperm
competition,
strength
choice,
tradeoffs
number
interact
influence
coevolutionary
dynamics
traits.
found
incorporating
can
result
males
investing
much
less
their
ejaculates
than
predicted
by
with
competition
only.
also
resulted
evolution
genetic
correlations
traits,
even
when
was
weak,
low.
This
suggests
may
be
important
systems
low
multiple
mating.
These
increased
as
increased.
When
high,
extreme
codivergence
preference
occurred
trait
traded
off
number.
male
lagged
behind
traits;
this
lag
decreased
increasing
competition.
Overall,
our
results
suggest
deserves
more
attention
theoretically
driving
ways
just
beginning
explored.
Language: Английский
Paternity bias and cryptic female choice in chickens
Poultry Science,
Journal Year:
2024,
Volume and Issue:
103(6), P. 103744 - 103744
Published: April 6, 2024
Sperm
competition
and
cryptic
female
choice
(CFC)
are
2
significant
mechanisms
of
postcopulatory
sexual
selection
that
greatly
impact
fertilization
success
in
various
species.
Despite
extensive
research
has
conducted
on
sperm
the
evolution
traits
internal
fertilization,
our
understanding
preferences
selecting
is
still
limited.
Here,
we
aimed
to
investigate
characteristics
CFC
chickens
by
utilizing
artificial
insemination
with
mixed
semen
control
for
variations
male
caused
perception
quality
mating
order.
Our
results
revealed
offspring
from
multiple-mated
females
exhibited
paternity.
Although
males
had
an
equal
number
viable
sperm,
1
consistently
a
15%
higher
rate
average,
regardless
whether
was
performed
fresh
or
diluted
semen.
This
result
suggested
this
demonstrates
superior
performance
competition,
potential
advantage
success.
While
dominant
generally
made
greater
genetic
contribution
most
offspring,
degree
varied
greatly,
ranging
11.11
75%.
Furthermore,
study
provided
evidence
influenced
precedence
certain
over
others.
Interestingly,
bias
not
observed
among
all
individuals,
as
derived
some
were
predominantly
sired
overall
disadvantaged
while
others
different
male.
Overall,
these
underscored
complex
processes
involved
emphasized
importance
theory.
Language: Английский
Sperm as a speciation phenotype in promiscuous songbirds
Evolution,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 1, 2024
Abstract
Sperm
morphology
varies
considerably
among
species.
traits
may
contribute
to
speciation
if
they
diverge
fast
in
allopatry
and
cause
conspecific
sperm
precedence
upon
secondary
contact.
However,
their
role
driving
prezygotic
isolation
has
been
poorly
investigated.
Here
we
test
the
hypothesis
that,
early
process,
female
promiscuity
promotes
a
reduction
overlap
length
distributions
songbird
populations.
We
assembled
data
set
of
20
pairs
populations
with
known
distributions,
published
estimate
divergence
time,
an
index
derived
from
extrapair
paternity
rates
or
relative
testis
size.
found
that
diverged
more
rapidly
promiscuous
Faster
between
was
caused
by
lower
variance
trait
species,
not
faster
mean
lengths.
The
reduced
is
presumably
due
stronger
stabilizing
selection
on
mediated
competition.
If
divergent
optima
causes
sympatry,
which
remains
be
shown
empirically,
promote
isolation,
rapid
songbirds.
Language: Английский
Selection on sperm size in response to promiscuity and variation in female sperm storage organs
Journal of Evolutionary Biology,
Journal Year:
2022,
Volume and Issue:
36(1), P. 131 - 143
Published: Nov. 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
Language: Английский
The surprising complexity and diversity of sperm storage structures across Galliformes
Ecology and Evolution,
Journal Year:
2024,
Volume and Issue:
14(6)
Published: June 1, 2024
In
internal
fertilisers,
the
precise
timing
of
ovulation
with
arrival
sperm
at
site
fertilisation
is
essential
for
success.
birds,
mating
often
not
synchronised
ovulation,
but
instead
females
utilise
specialised
storage
tubules
(SSTs)
in
reproductive
tract,
which
can
ensure
are
always
available
time
whilst
simultaneously
providing
a
mechanism
post-copulatory
sexual
selection.
Despite
clear
importance
SSTs
success,
we
know
little
about
mechanisms
involved
acceptance,
storage,
and
release.
Furthermore,
most
research
has
been
conducted
on
only
small
number
species,
based
usually
assumed
to
look
function
same
way
across
all
species.
Here,
conduct
comparative
exploration
SST
morphology
26
species
Galliformes.
We
show
that
SSTs,
surrounding
tissue,
vary
significantly
provide
observational
evidence
Galliformes
exhibit
least
5
distinct
categories
tubule
types,
including
distinctive
coiled
multi-branched
tubules,
describe
2
additional
features
tissue.
suggest
functional
explanations
variation
propose
next
steps
future
research.
Our
findings
indicate
likely
be
far
more
variable
than
previously
assumed,
potentially
important
consequences
our
understanding
birds
selection
general.
Language: Английский
Extra-pair paternity and sperm length variation in a far northern Great Tit (Parus major) population
Journal of Ornithology,
Journal Year:
2024,
Volume and Issue:
unknown
Published: July 25, 2024
Abstract
Extra-pair
paternity
is
common
among
socially
monogamous
bird
species
and
considered
an
important
driver
of
post-copulatory
sexual
selection
on
ejaculate
traits
including
sperm
traits.
Patterns
extra-pair
size
both
show
substantial
variation
populations,
yet
we
know
little
about
the
expression
these
key
reproductive
at
high
latitudes.
Here
report
patterns
describe
in
dimensions
a
Norwegian
population
Great
Tit
(
Parus
major
)
breeding
beyond
polar
circle
69°
northern
latitude.
Across
six
study
years,
detected
19.2%
26
broods,
average
4.7%
nestlings
per
brood
were
offspring.
As
expected
from
results
previous
intraspecific
analyses
latitudinal
rates,
observed
rate
offspring
was
low
comparison
to
published
estimates
more
southern
populations
(range:
2.9
−
20.4%).
Our
therefore
support
pattern
decreasing
levels
with
increasing
latitude
this
also
for
extremely
Overall
mean
total
length
amounted
97.5
±
0.6
(SE)
μm
30.6%
phenotypic
explained
by
differences
samples.
The
among-sample
coefficient
sample
1.93%.
Using
comparative
work
as
yardstick,
value
substantially
lower
than
frequency
Language: Английский