BREEDING BIOLOGY OF ACADIAN FLYCATCHERS IN A BOTTOMLAND HARDWOOD FOREST

摘要

From 1993-1995, we located and monitored 601 Acadian Flycatcher (Empidonax virescens) nests in large contiguous tract of bottomland hardwood forest on the White River National Wildlife Refuge, Arkansas. Annual reproductive success was significantly different among years; ranging from 10-25/100 (Mayfield Estimate) over the three years of the study. There was no significant difference in nest success among study Plots, with nesting success showing a trend of increasing late in the breeding season. Clutch size for nonpar- Asitized nests averaged 2.9±0.02 (SE) eggs with a mode of 3. Rates of Brown-headed Cowbird (Molothrus Ater) parasitism were low (21/100), accounting for 7/100 of all nest failures.