Western North America population trends for six wintering raptor species.
收藏NIAID Data Ecosystem2026-03-08 收录
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资源简介：
The relationship between year and mean effort-corrected count (raptors/(hours+hours2)) for (A) American Kestrels, (B) Golden Eagles, (C) Northern Harriers, (D) Prairie Falcons, (E) Red-tailed Hawks, and (F) Rough-legged Hawks in western North American Christmas Bird Counts from 1975 to 2011. Solid lines indicate a predictive relationship and dashed lines represent 95% confidence intervals.
创建时间：
2014-01-22
