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THE WILSON JOURNAL OF ORNITHOLOGY • Vol 124. No. 4. December 2012 
relocating a new daily use-site, and followed I 
(usually "15 m) until she ceased her inju 
display and left the area so she would not retu 
while we handled the nestlings. We marked t 
new use-site using a handheld GPS. We paced c 
the straight-line distance between sequential us 
sites if they were <15 m apart. We used GF 
locations to measure the straight-line inter-us, 
site distance if the new site was relocated >15 
from the previous. 
We considered the age of a brood to be the a* 
of the first-hatched nestling. Nestling body masse 
were obtained during each visit using a portahl 
electronic balance (± 0.005 g, that was recali 
brated following each relocation. We marked ,h 
unders.de of the feet of the firs, hatched nestling 
foi nests with two nestlings, using a non-toxi, 
permanent marker. Marks were reapplied a 
needed prior to Hedging. We replaced nestling: 
where they were found and waichcd them unfi 
they assumed a stationary, cryptic posture. 
,We.codec,ed video of a single nesi-site 
wMn 5 n m y P f adnS “ f atnouflil Sed video camera 
within 5 m of an active use-site and recorded 
brooding and movement activity from 1800 to 
2100 hrs MST. 
Statistical Analyses .—We calculated mean use- 
site movement distances for each nestling age and 
evaluated polynomial regressions before selecting 
a cubic regression due to the high correlation 
coefficient a,lL * correspondence with our observa¬ 
tions of nestling movement tendencies. We ft a 
cufuc polynomial curve to the nestling growth 
data because it maintained the linear nature of the 
curve while allowing for a biologically accurate 
representation of slower nestling growth both 
early and late in the nestling stage. We used one- 
tailed independent sample /-tests to assess signif- 
,car l cc = ^-95 for all tests) of the correlation 
coeflicients of the growth curve and movement 
ala. We performed a two-tailed, paired sample 
^ test to assess whether hatch order within 
c utches influenced nestling growth rates. 
RESULTS 
Eight nest sites were found during incubation 
and included in analyses. One brood was discov- 
ere c * u, 'ng the nestling stage but was omitted 
