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Figure 1


Fig. 1. Diurnal urea excretion (Jurea) (A) and ammonia excretion (Jamm) (B) in food-deprived Rivulus marmoratus exposed to a 12 h:12 h light:dark photoperiod (Series I). White and black bars above the graph indicate periods of light and dark, respectively. Values are expressed as means ± s.e.m. (N=8). Jurea values followed a significant rhythm (F2,9=23.8, P=0.0003) whereas Jamm did not demonstrate a rhythm (F2,9=0.84, P=0.46).





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