250 500 750 1000 1250 1500 1750 2000 2250 2500 Altitude of most favourable winds aloft (m)
Figure 4.5 Correlation between the altitude of densest nocturnal bird migration and the altitude of most favourable wind, as measured by radar in the southeastern USA. The most favourable wind was defined as a wind blowing toward the north-northeast in spring or south-southwest in autumn and occurring at the lowest possible altitude. Regression relationship: y = 58.6 + 0.987(x), r = 0.96, t = 22.9, P < 0.01, N = 38. From Gauthreaux (1991).
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