Should Nest Construction Be İntervened İn Domestic Bird Breeding?
Journal of Anatolian Environmental and Animal Sciences,
Год журнала:
2025,
Номер
10(2), С. 126 - 131
Опубликована: Март 15, 2025
The
aim
is
to
get
as
many
offspring
possible
from
domestic
songbirds
during
the
breeding
season.
However,
inadequacy
of
nest
material
used
construction
and
individual
abilities
birds
in
directly
affect
success
In
this
study,
nests
built
by
two
groups
female
Gloster
canaries
using
same
were
evaluated,
effects
on
hatching
rates
fertile
eggs
development
evaluated.
For
purpose,
8
used,
4
1st
group
(T-1)
2nd
(T-2).
Female
showing
estrus
artificially
inseminated,
Group
T-1
not
intervened
nests,
T-2
construction,
observed.
It
was
concluded
that
more
successful
than
group.
may
be
obtain
eliminating
deficiencies
observed
a
certain
extent.
study
determine
interventions
made
inseminated
under
equal
conditions
incubation
process
rate.
Язык: Английский
Pre‐ and Post‐Copulatory Sexual Traits Influence Male Fitness Across a Mosaic Hybrid Zone
Ecology and Evolution,
Год журнала:
2025,
Номер
15(2)
Опубликована: Фев. 1, 2025
ABSTRACT
Primary
and
secondary
male
sexual
traits
can
influence
the
interspecific
interactions
of
hybridizing
populations,
yielding
fitness
consequences
either
promoting
or
restricting
gene
flow.
In
this
study,
we
evaluated
relative
two
species
tidal
marsh
endemics:
saltmarsh
(
Ammospiza
caudacutus
)
Nelson's
sparrows
A.
nelsoni
assessed
effects
condition
competitive
ability
on
resulting
patterns
paternity
We
compared
reproductive
success
(number
offspring
sired)
among
saltmarsh,
Nelson's,
hybrid
sparrow
males
n
=
125)
modeled
in
relation
to
measured
pre‐copulatory
(body
size,
fat
scores,
muscle
scores)
post‐copulatory
(cloacal
protuberance
(CP)
volume
sperm
length)
across
sites
within
center
zone.
found
had
higher
levels
skew
fertilization
than
greater
output
both
hybrids,
suggesting
competition
may
occur.
Body
size
was
best
predictor
success,
independent
genotypes,
providing
evidence
for
a
role
selection.
also
selection
contributing
hybridization,
with
CP
length
increasing
number
sired.
Differential
mean
by
hybridization
has
potential
drive
asymmetrical
introgression;
however,
drivers
differed
between
sites,
level
flow
are
context
dependent
not
stable
small
sptatial
scale
mosaic
Overall,
few
nearly
equal
backcrossing
parental
zone
suggest
mechanisms
such
as
reinforcement
exist
limit
minimize
asymmetric
introgression.
Язык: Английский
Sperm as a speciation phenotype in promiscuous songbirds
Evolution,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 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.
Язык: Английский
Flagellum tapering and midpiece volume in songbird spermatozoa
Journal of Morphology,
Год журнала:
2022,
Номер
283(12), С. 1577 - 1589
Опубликована: Окт. 19, 2022
In
contrast
to
numerous
studies
on
spermatozoa
length,
relatively
little
work
focuses
the
width
of
spermatozoa,
and
particularly
midpiece
flagellum.
flagellated
flagellum
provides
forward
thrust
while
energy
may
be
provided
via
mitochondria
in
and/or
through
glycolysis
along
itself.
Longer
flagella
able
provide
greater
but
also
require
stronger
structural
features
more
or
larger
supply
sufficient
energy.
Here,
we
use
scanning
electron
microscopy
investigate
ultrastructure
from
55
passerine
species
26
taxonomic
families
Passerides
infraorder.
Our
data
confirm
qualitative
observation
that
tapers
its
show
longer
are
wider
at
neck.
This
pattern
is
similar
mammals,
likely
reflects
need
for
cells
against
shearing
forces.
We
further
estimate
volume
mitochondrial
helix
it
correlates
well
with
supporting
length
as
a
proxy
volume,
least
between-species
where
highly
variable.
These
results
important
context
understanding
evolutionary
correlations
among
different
sperm
cell
components
dimensions.
Язык: Английский
Sperm length divergence as a potential prezygotic barrier in a passerine hybrid zone
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.
Язык: Английский
Effects of fixatives and storage duration on avian sperm morphology
Journal of Ornithology,
Год журнала:
2022,
Номер
164(1), С. 171 - 181
Опубликована: Сен. 8, 2022
Abstract
Sperm
cells
are
variable
both
within
and
among
species.
To
be
able
to
accurately
measure
sperm
understand
their
function,
it
is
important
that
preserved
in
a
manner
maintains
structural
integrity.
Formalin
widely
used
fixative
storage
medium
for
cells,
but
few
studies
have
examined
the
effect
of
fixation
long-term
on
morphological
Ethanol
also
common
agent
tissue
samples,
here
we
examine
if
formalin
or
ethanol
alters
cell
size
We
found
no
significant
effects
process
fresh
fixed
ethanol.
Further,
there
were
consistent
length
changes
stored
over
period
227
days,
three
years.
A
comparison
across
13–14
years
time
showed
small
reduction
0.93%.
Furthermore,
initially
remained
quite
stable
dry
glass
slides
minimum
six
months
(we
mean
0.18%
after
6
months).
The
proportion
with
head
damage
was,
however,
much
higher
samples
than
those
formalin.
Overall,
70%
had
acrosome
versus
only
3%
Finding
intact
measuring
length,
therefore,
required
greater
effort
samples.
Our
findings
indicate
use
from
study
morphometrics
justified
either
fixative,
although
clearly
preserves
better.
Язык: Английский