Fig. 3. Body mass (A), dry fat mass (B), dry lean mass (C) and body water mass (D) in male field voles exposed to short day photoperiod (SD, 8 h:16 h L:D, N=38) and long day photoperiod (LD, 16 h:8 h L:D) for 1–28 days (the increase phase, N=20) or 29–70 days (the plateau phase, N=25). Dry fat mass was calculated as the sum of subcutaneous, epididymal, perirenal, retroperitoneal and mesenteric fat depots. Bars are means + 1 S.D. Different letters above bars indicate significant differences between the groups, as assessed by one-way ANOVA followed by Tukey pairwise comparisons.