Bat Activity in Thinned, Unthinned, and Old-Growth Forests in Western Oregon

摘要: Many aspects of the influences forest management activities on bats (Chiroptera) in Pacific Northwest are poorly known, We compared thinned and unthinned stands same age old-growth to determine potential differences structure amount use by bats. hypothesized that activity levels would differ differing as a result bistory be similar structure. used automated ultrasonic detectors (Anabat II) record calls 50-100-year-old stands, (200 yr old) Oregon Coast Range during summers 1994 1995. Our median index bat was higher than were not able detect significant difference between for stands. More 90% identifiable passes identified from Myotis species. The 3 stand types we examined differed certain structural characteristics such density size trees, overstory understory cover. concluded changes caused thinning may benefit creating habitat young more effectively.