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First published online June 29, 2006
Journal of Experimental Biology 209, 2696-2703 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02288
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Characterization of diurnal urea excretion in the mangrove killifish, Rivulus marmoratus

Tammy M. Rodela and Patricia A. Wright*

Department of Integrative Biology, University of Guelph, Guelph, ON, N1G 2W1, Canada


Figure 1
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  		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).

 

Figure 2
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  		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).

 

Figure 3
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  		Fig. 3. Diurnal urea excretion (Jurea) in food-deprived Rivulus marmoratus exposed to a photoperiod of 0 h:24 h light:dark (Series III). The black bar above the graph indicates the dark period. Values are expressed as means ± s.e.m. (N=8). Jurea values followed a significant rhythm (F2,9=60.7, P=0.00001).

 

Figure 4
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  		Fig. 4. Diurnal urea excretion (Jurea) in food-deprived Rivulus marmoratus exposed to an inverse photoperiod of 12 h:12 h dark:light (Series IV). 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=39.6, P=0.00003).

 

Figure 5
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  		Fig. 5. Urea excretion (Jurea) (A) and ammonia excretion (Jamm) (B) in food-deprived Danio rerio exposed to a 12 h:12 h light:dark period (Series V). White and black bars above the graph indicate periods of light and dark, respectively. Values are expressed as means ± s.e.m. (N=8). Neither Jurea nor Jamm demonstrated a significant rhythm (F2,9=2.33, P=0.15, F2,9=1.28, P=0.33).

 




© The Company of Biologists Ltd 2006