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原文連結
論文資訊
- 類型：已發表論文
- 日期：2020-07-14
摘要
We explored nest site placement and re-use relative to ornamental tree usage and 城市ization level in a diurnal raptor community in southern California (USA) during three discrete time periods spanning five decades (1971–2018). Re-use of prior years’ nests varied among 物種, with Red-tailed Hawks (Buteo jamaicensis) and American Kestrels (Falco sparverius) showing moderate re-use rates (ca. 30%), and Red-shouldered Hawks (Buteo lineatus), and Cooper’s Hawks (Accipiter cooperii) showing almost none. Nearly all nests were in native and naturally-occurring trees during the 1970s, yet by 2018, most Cooper’s Hawk nests, and many Red-tailed Hawk nests, were located in ornamental vegetation such as pines (Pinus spp.) and eucalyptus (Eucalyptus spp.). The amount of 城市 cover around nest sites increased
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