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Figure 6


Fig. 6. The predicted differences in net energy gain between soaring ({circ}) and flapping (+) flight (Rs-Rf) calculated with observed combinations of air speed (Va, m s-1), ground speed (Vg, m s-1) and flight strategy, for black-headed gulls (A) and lesser black-backed gulls (B). Parameter estimates for R are as follows: En=20 W, D=10000 m, tp=1800 s. As observed Va and Vg values are highly confounded (as shown in Fig. 4), Rs-Rf was not plotted against both Va and Vg.





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