We determined foraging characteristics of Cerulean Warblers (Dendroica cerulea) in Morgan-Monroe and Yellowwood state forests in southern Indiana from 2007-2009. The average foraging height, tree height, and tree diameter at breast height (dbh) were greater for males than females. During 2008, areas of our study site received silvicultural manipulations that allowed us to compare foraging behavior before and after treatments. Harvesting techniques included shelterwood and clearcut or single and group tree selection. Foraging Cerulean Warblers in harvested areas had a lower average foraging height, tree height, and dbh during post-treatment than in pre-treatment years. Additionally, we examined foraging tree species selection and determined expected foraging tree species use based on basal area and stem density of tree species in the territories. We compared territory composition to random sites to explore tree selection on a larger scale. The most commonly used foraging tree species were bitternut hickory (Carya cordiformis), white oak (Quercus alba), and tulip tree (Liriodendron tulipifera). / Department of Biology

This study presents the results of a field study comparing the effects of two forest harvest methods on the Cerulean Warbler, a state-endangered songbird. Population estimates and a breeding study produced no significant differences among groups, although the species was not attracted to forest openings and experienced decreased nest success in treated sites. Additional study on prey influences showed strong correlations with timing of breeding and peak larval lepidopteran abundance, specifically on oak and hickory tree species. Data suggests that these trees are vital to increased probability of nest success due to an increase in prey availability within territories. Further study is recommended to ascertain the long-term effects of forest harvest and the importance of oak and hickory dominated landscapes to the persistence of this species. / Cerulean warbler population response and nesting success in forests with recent silviculture -- Avian nesting ecology and prey abundance using frass drop as an indicator. / Department of Biology