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First published online October 19, 2007
Journal of Experimental Biology 210, 3838-3847 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.010025
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Effects of photoperiod history on body mass and energy metabolism in Brandt's voles (Lasiopodomys brandtii)

Qin Lu1,2, Wen-Qin Zhong1 and De-Hua Wang1,*

1 State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100080, China
2 Graduate School of the Chinese Academy of Sciences, Beijing 100049, China


Figure 1
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  		Fig. 1. Effects of photoperiod transfer on body mass in Brandt's voles. During lactation, short photoperiod (SD) voles showed significantly lower body mass than long photoperiod (LD) voles. After weaning, the differences among the four groups occurred from 42 days of age to the termination of the experiment. Data are shown as means ± s.e.m. (N=8). *Significant difference between two groups (during lactation) or among four groups (during the postweaning photoperiod acclimation). LL, chronically long photoperiod; LS, preweaning long but postweaning short photoperiod; SL, preweaning short but postweaning long photoperiod; SS, chronically short photoperiod.

 

Figure 2
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  		Fig. 2. Effect of photoperiod transfer on serum leptin concentration in Brandt's voles in original data (A), and after removing the effects of body mass (BM, B) and body fat mass (BF, C). Photoperiod transfer affected the serum leptin level but no differences were detected after removing the effects of body mass and body fat mass. Different letters above the bars represent a significant difference. Data are shown as means ± s.e.m. (N=8 except for SS where N=5).

 

Figure 3
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  		Fig. 3. Correlation between serum leptin concentration and digestible energy intake in Brandt's voles. Serum leptin concentration was negatively correlated with digestible energy intake after adjusting for differences in body mass. Open diamond, LL group; filled diamond, LS group; open square, SS group; filled square, SL group. The line represents the relationship between parameters for all the voles (r=–0.542, P=0.002; N=8 except for SS where N=5).

 

Figure 4
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  		Fig. 4. Correlation between serum leptin concentration and body mass (A) and body fat mass (B) in Brandt's voles. Serum leptin concentration was correlated positively with body mass (r=0.529, P=0.003) and body fat mass (r=0.681, P<0.001; N=8 except for SS where N=5).

 

Figure 5
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  		Fig. 5. Effect of photoperiod transfer on uncoupling protein 1 (UCP1) content in Brandt's voles. (A) SD during both the pre- and the postweaning period increased UCP1 content, with no significant interaction. Data are means ± s.e.m. (N=8). r.u., relative units. Different letters above columns signify means that differed significantly. (B) Autoradiograms displaying UCP1 labelling from individuals from each of the four groups.

 

Figure 6
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  		Fig. 6. Correlation between non-shivering thermogenesis capacity (NSTcap) and UCP1 content in Brandt's voles. NSTcap was positively correlated with UCP1 content (r=0.614, P<0.001; N=8).

 

Figure 7
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  		Fig. 7. Correlation between serum leptin concentration and UCP1 content in Brandt's voles. Serum leptin concentration was negatively correlated with UCP1 content (r=–0.419, P=0.024; N=8 except for SS where N=5).

 

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© The Company of Biologists Ltd 2007