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Nest-site selection and breeding behavior of the migratory Rock Wren (Salpinctes obsoletus)in...
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Nest-site selection and breeding behavior of the migratory Rock Wren (Salpinctes obsoletus)in western Kansas.
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Description
Author
Matiasek
,
Jennifer
J
.
Title
Nest-site
selection
and
breeding
behavior
of the
migratory
Rock
Wren
(Salpinctes
obsoletus)in
western
Kansas
.
Degree Program
Biology
Abstract
During
the
summer
of
1997
I
investigated
the
breeding
biology
of a
primarily
migratory
population
of
Rock
Wrens
(Salpinctes
obsoletus)
in the
Scott
Lake
State
Park
area
of
Scott
County
and
Logan
County
,
Kansas
.
I
made
behavioral
observations
on
nesting
adults
and
fledglings
and
evaluated
nest-site
selection
for
50
different
nests
.
Five
banded
birds
were
used
as an
aid
to
examine
nest
chronology
and the
contributions
of
each
sex
.
Females
in this
population
began
laying
eggs
during
the
last
week
in
April
and the
latest
eggs
hatched
during
the
first
week
in
August
.
Five
days
prior
to
egg-laying
,
males
were
observed
giving
call
notes
at
potential
nest
sites
, with
females
following
10
investigate
each
cavity
.
Both
active
and
old
nests
could
be
located
by
identifying
rock
paths
built
by the
wrens
at the
entrances
of
nest
cavities
.
I
observed
a
single
female
wren
carry
91
rocks
to a
nest
site
in
two
hours
while
the
male
sang
.
Females
initiated
egg-laying
in a
new
nest
the
day
offspring
fledged
from a
previous
nest
.
Once
females
began
incubation
of
new
nests
,
males
continued
to
feed
juvenile
wrens
from
previous
nests
for
up
to
three
weeks
.
Nine
days
after
one
clutch
hatched
,
I
observed
a
female
cowbird
remove
a
single
Rock
Wren
chick
from the
nest
cavity
and
drop
it
on the
ground
outside
. To
assess
what
factors
might
protect
nests
from
predation
and
Brown-headed
Cowbird
(Molothrus
ater)
parasitism
.
I
measured
the
height
,
orientation
, and
cavity
dimensions
of the
50
nests
.
According
to
univariate
tests
,
no
nest
structure
variable
was
significantly
related
to
nest
success
.
Discriminant
function
analysis
,
statistically
insignificant
trends
in the
data
, and
my
observations
indicated
nests
that were
more
successful
had
smaller
openings
and were
located
deeper
within
the
cavities
.
Successful
nests
also
appeared
to
usually
be
located
lower
10
the
ground
.
Over
the
entire
breeding
season
Rock
Wrens
on
40
territories
produced
206
offspring
.
Predation
did
not have a
significant
effect
on
reproductive
success
;
only
16%
of
nests
had their
contents
preyed
upon
, and
although
46%
of
nests
contained
cowbird
eggs
,
parasitism
caused
reproductive
failure
only
when
more
than
one
cowbird
chick
fledged
.
My
results
may
reflect
natural
selection
for
specific
types
of
nests
that
limit
predator
and
Brown-headed
Cowbird
predation
.
When
this
baseline
data
from
one
year
of
study
is
combined
with
data
and
observations
from
future
years
of
study
on this
primarily
migratory
Rock
Wren
population
,
significant
effects
of
nest-structure
variables
on
productivity
and a
better
understanding
of
Rock
Wren
breeding
biology
may
emerge
.
Date Original
1998
Publisher
Fort Hays State University
Relation
Digital reproduction of the Fort Hays State University Theses Collection.
Type
Text
Format
application/pdf
Identifier
MatiasekJennifer_1998_web.pdf
Source
LD2652 .T5 B5 M37 1998
Language
eng
Relation-Requires
Adobe Reader is required to view this item. Download at
http://get.adobe.com/reader/.
Rights
Copyright 1998 Jennifer J. Matiasek
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