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Nesting Dynamics Of The Eastern Bluebird (Sialia Sialis) In Southeastern Illinois, Susan E. Nelle
Nesting Dynamics Of The Eastern Bluebird (Sialia Sialis) In Southeastern Illinois, Susan E. Nelle
Masters Theses
Data collected from 1981 through 1988 from an Eastern Bluebird (Sialia sialis) nesting box trail, involving 512 nests and 2176 eggs, in Crawford County, Illinois, were analyzed and compared to similar published works. The average nesting season lasted 167.4 days, ran from 17 March through 31 August, and was divided into three breeding peaks (or phases). Most breeding pairs were observed with either one or two clutches per season; however, triple-brooded pairs were also present, the clutches of which coincided well with the three peaks. Most data showed a decrease as the season progressed. For example, mean clutch …