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Fig. 7. The predicted relative influence of the wind components
(xw and yw, left and center
respectively) on air speed (Va) for each dataset (A) SRD
(simulated random data; no relation between wind and flight) (B) SWI
(simulated wind influence) (C) APM (autumn passerine migration). The form of
each GAM is Va
lo(xw,
0.8, 2)+lo(yw, 0.8, 2). The y-axis
represents the contribution of xw and
yw on Va. The solid line is the fitted
functional response and the broken lines represent the 2x standard error
curves, the circles represent the partial deviance for each observation point.
The local minima in Fig. 7B correspond with xg (6 m
s-1) and yg (3 m s-1) in the SWI
dataset. Figures on the far right represent the observed (y-axis)
vs fitted Va (m s-1)
(x-axis); note that the x and y axis are not always
equally scaled.