SOD-induced changes in foraging and nesting behavior of insectivorous, cavity-nesting birds

Abstract

Sudden oak death (SOD) is a tree disease caused by a recently described pathogen, Phytophthora ramorum. The disease affects dozens of plant species, but its effects are particularly pronounced in stands of coast live oak (Quercus agrifolia), often resulting in large stands with dead canopies and many downed trees. Such disease-induced habitat changes may impact bird populations both directly and indirectly. For example, forest dieback can result in changes to insect populations, which subsequently impact insectivorous birds by forcing them to switch prey items, change foraging substrates, or increase foraging time. This can ultimately impact the nesting success of these birds. The goal of this study is to examine the effects of SOD-induced changes in oak woodlands on insectivorous cavity-nesting birds, particularly oak titmice (Baeolophus inornatus) and chestnut-backed chickadees (Poecile rufescens).

Parent Publication

• Proceedings of the sudden oak death second science symposium: the state of our knowledge

Citation

Apigian, Kyle; Allen-Diaz, Barbara. 2006. SOD-induced changes in foraging and nesting behavior of insectivorous, cavity-nesting birds. In: Frankel, Susan J.; Shea, Patrick J.; and Haverty, Michael I., tech. coords. Proceedings of the sudden oak death second science symposium: the state of our knowledge. Gen. Tech. Rep. PSW-GTR-196. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: 191-192