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Fig. 3. The effect of multiple step changes in the magnetic field and time of
season on migratory fuelling in thrush nightingales. Data from experiments in
2000 and 2001 are pooled. Body mass increase from day 1 (mean ± s.e.m.)
for the early (A) and late (B) replicate, respectively. Experimental birds
receiving a magnetic treatment are represented by open symbols; control birds
are represented by filled symbols. In the early replicate, experimental birds
increased more in body mass than control birds, whereas in the late replicate
there was no difference between the treatments (ANOVA with repeated
measurement; early replicate: F1,12=8.1, P=0.02;
late replicate: F1,12=0.1, P=0.8). From Kullberg
et al. (Kullberg et al.,
2003).
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