Seasonal response of Wood Thrushes to taped-playback songs

摘要

Broadcast vocalizations are a useful technique to detect various bird species (see review by Johnson et al. 1981), such as raptors (e.g., Lynch and Smith 1984, Kimmel and Yahner 1990, Morrell et al. 1991), marsh birds (e.g., Marion et al. 1981, Johnson and Dinsmore 1986, Kaufmann 1988), and songbirds (e.g., Falls 1981, Richards 1981). As part of a study focusing on nest-site selection and nesting success of Wood Thrushes (Hylocichla mustelina) in a forest managed for Ruffed Grouse (Bonasa umbellus) habitat in central Pennsylvania, we developed a survey protocol using taped-playback songs as a means of increasing the number of contacts of Wood Thrushes during the breeding season. Our objective in this study was to test the response of Wood Thrushes to taped-playback songs among three trials (Ⅰ-Ⅲ) during the 1992 and 1993 breeding seasons.