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Figure 2


Fig. 2. Effects of prior exposure to restricted feeding regimes on subsequent induction of seasonal responses under long days in photorefractory male Red-headed Bunting (Emberiza bruniceps). Birds (N=6–8) were first exposed for eight weeks to dim 12 h light: 12 h darkness (12L:12D; L=~5 lux, D=0 lux) with restricted feeding (RF) regimes [6 h food present: 18 h food absent, P:A 6:18 (group 3, open circle) or P:A 12:12 (group 4, closed circle)] and then subsequently subjected for another 13 weeks to a highly stimulatory photoperiod (16L:8D; L=400 lux; D=0 lux) with food ad libitum (free food, FF). The vertical dashed line indicates the boundary between the 12L:12D and 16L:8D exposures. All other details are the same as in Fig. 1.





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