Publication Year
Spring 1985
Volume
1
Number
18
Document Type
Article
Abstract
Since 1966 the winter populations of Dark-eyed Juncos, Junco hyemalis at the UWM Field Station have been monitored by mark-recapture methods. Schnabel estimates with 95% confidence intervals are presented for each winter. The population has varied irregularly between 60 and 196. Comparisons of these estimates with Wisconsin Christmas Bird Counts of juncos reveals a positive correlation with the average number of juncos per Wisconsin Christmas Bird Count, indicating that the year-to-year fluctuations at the Field Station correspond to the general state-wide fluctuations. However, the Christmas counts show a rising trend over the past 19 years while the Field Station population does not.
Recommended Citation
Weise, C.M. 1985. Wintering populations of juncos at the UWM Field Station. Field Station Bulletin 18(1): 1-7.