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The Wilson Journal of Ornithology 124( 3):614-620. 2012 
Estimation of Female Home-range Size During the Nestling Period of 
Dark-eyed Juncos 
Dustin G. Reichard ' 2 and Ellen D. Ketterson 1 
ABS TRACT.—Studies of spatial activity of songbirds 
during the nesting cycle have largely focused on male 
activity and neglected female space use. particularly 
outside the fertile period. We estimated the home-range 
size of seven female Dark-eyed Juncos Uunco hyemalis ) 
3 days after their nestlings had hatched. We used 
radiotelemetry to track female movements for 2 hrs on 
ihe afternoon of day 3 of nestling life, and 2 hrs on both 
the morning and afternoon of days 4 and 5. Female 
location and beha\ ior were recorded every 10 min for the 
1 Department of Biology and Center for the Integrative 
IN4740 5 A u'™A BChaVi ° r ’ ,ndiani ' Univcrsil >'' Bloomington, 
2 Corresponding author; e-mail: dgreicha@indiana.edu 
duration of tracking. Females exhibited a mean home- 
range size of 0.833 ha (range = 0.156-2.450 ha). Our 
estimate ot home-range si/e during the nestling period 
was significantly smaller than a previous estimate of 
female home-range size during the fertile period in the 
same junco population. Home-range size varied greatly 
between individuals, and the observed differences may 
be attributable to variation in resource availability. 
Received 2 November 2011. Accepted 25 February 2012. 
The home-range size of temperate songbirds 
(Passeriformes) during the breeding season can 
have profound effects on access to resources and 
