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First published online February 15, 2008
Journal of Experimental Biology 211, 649-653 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.014183
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Food intake and fuel deposition in a migratory bird is affected by multiple as well as single-step changes in the magnetic field

Ian Henshaw1,*, Thord Fransson2, Sven Jakobsson1, Johan Lind1, Adrian Vallin1 and Cecilia Kullberg1

1 Department of Zoology, Stockholm University, SE-106 91 Stockholm, Sweden
2 Swedish Museum of Natural History, Bird Ringing Centre, Box 50 007, SE-104 05 Stockholm, Sweden


Figure 1
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  		Fig. 1. The effect of a single-step change in magnetic field and time of season on migratory fuelling in thrush nightingales. 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.

 

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  		Fig. 2. Body mass increase (circles) from day 1, and daily food intake (mean ± s.e.m.; triangles) for the early season (A) and late season (B) replicates in all three years (2000, 2001 and 2004). Experimental birds receiving a magnetic treatment (single-step or multiple changes in magnetic field value) are represented by open symbols; control birds are represented by filled symbols.

 

Figure 3
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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., 2003Go).

 

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