A Multiscaled Model of Southwestern Willow Flycatcher Breeding Habitat

摘要: The southwestern willow flycatcher (SWFL; Empidonax traillii extimus) is an endangered songbird whose habitat has declined dramatically over the last century. Understanding selection patterns and ability to identify potential breeding areas for SWFL crucial management conservation of this species. We developed a multiscaled model with Geographic Information System (GIS), survey data, GIS variables, multiple logistic regressions. obtained presence absence data from river-ine ecosystem reservoir delta in south-central Arizona, USA, 1999. extracted variables satellite imagery digital elevation models characterize vegetation floodplain within project area. used regressions cell-based (30 x 30 m) modeling environment (1) determine associations between breeding-site occurrence at different spatial scales (0.09-72 ha), (2) construct predictive model. Our best explained 54% variability following variables: density site (0.09 proportion dense 4.5-ha neighborhood, amount or flat terrain 41-ha neighborhood. sites was highest that predicted be most suitable area external test 200 km away. Conservation efforts must focus on protecting not only occupied patches, but also surrounding riparian forests ensure long-term viability SWFL. will use map prioritize future effort, examine changes abundance quality time.