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Figure 2


Fig. 2. Diurnal urea excretion (Jurea) (A) and ammonia excretion (Jamm) (B) in fed Rivulus marmoratus exposed to a 12 h:12 h light:dark photoperiod (Series II). White and black bars above the graph indicate periods of light and dark, respectively. Arrows mark the times when the fish were fed. Values are expressed as means ± s.e.m. (N=8). Jurea values followed a significant rhythm (F2,9=18.3, P=0.0007). Jamm also demonstrated a significant rhythm (F2,9=11.6, P=0.0032).





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