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Table 2.

Osmoregulatory parameters for whitebellied sunbirds fed sucrose solutions from 0.07 to 2.5 mol l-1, with and without supplementary drinking water

Total water gain (ml day-1)
CF volume (ml day-1)
CF osmolality (mosm kg-1)
Total osmotic excretion (mosm day-1)
CF Na+ concentration (mmol l-1)
CF K+ concentration (mmol l-1)
[Sucrose] (mol l-1)No waterWith waterNo waterWith waterNo waterWith waterNo waterWith waterNo waterWith waterNo waterWith water
0.07 * 47.92±8.05 * 28.73±4.44 * 14.2±3.1 * 0.37±0.04 * 1.14±1.84 * 0.73±0.37 
0.1 * 47.60±9.24 * 30.37±9.15 * 10.5±3.8 * 0.30±0.11 * 0.67±0.34 * 0.47±0.16 
0.25 31.28±3.17 31.12±5.03 19.93±4.02 21.06±5.07 7.1±4.7 6.2±2.6 0.14±0.10 0.13±0.05 0.73±0.81 0.34±0.16 0.40±0.08 0.37±0.09 
0.5 15.90±2.54 17.80±2.04 9.46±2.71 10.16±2.49 30.4±13.4 25.7±6.0 0.27±0.09 0.26±0.09 0.38±0.22 0.56±0.42 0.73±0.25 0.65±0.33 
8.44±1.16 9.88±2.02 3.09±0.77 4.27±1.88 58.6±64.8 35.7±18.8 0.17±0.17 0.13±0.04 1.01±0.35 0.96±0.55 1.90±0.96 1.66±0.78 
1.5 5.18±0.94 7.25±2.57 0.96±0.43 2.15±1.64 195.2±129.8 78.8±32.6 0.18±0.17 0.14±0.06 5.59±6.71 2.78±4.07 4.85±2.88 3.47±1.57 
3.91±0.56 11.24±8.42 0.26±0.11 5.03±5.53 467.2±654.9 49.6±31.5 0.13±0.22 0.17±0.15 8.13±7.83 1.29±0.96 13.69±12.15 2.40±1.80 
2.5 3.05±0.37 8.98±3.88 0.04±0.03 3.44±2.22 460.9±253.3 79.6±118.9 0.02±0.01 0.13±0.08 12.67±8.14 1.11±0.80 21.79±7.92 2.31±1.32 
Total water gain (ml day-1)
CF volume (ml day-1)
CF osmolality (mosm kg-1)
Total osmotic excretion (mosm day-1)
CF Na+ concentration (mmol l-1)
CF K+ concentration (mmol l-1)
[Sucrose] (mol l-1)No waterWith waterNo waterWith waterNo waterWith waterNo waterWith waterNo waterWith waterNo waterWith water
0.07 * 47.92±8.05 * 28.73±4.44 * 14.2±3.1 * 0.37±0.04 * 1.14±1.84 * 0.73±0.37 
0.1 * 47.60±9.24 * 30.37±9.15 * 10.5±3.8 * 0.30±0.11 * 0.67±0.34 * 0.47±0.16 
0.25 31.28±3.17 31.12±5.03 19.93±4.02 21.06±5.07 7.1±4.7 6.2±2.6 0.14±0.10 0.13±0.05 0.73±0.81 0.34±0.16 0.40±0.08 0.37±0.09 
0.5 15.90±2.54 17.80±2.04 9.46±2.71 10.16±2.49 30.4±13.4 25.7±6.0 0.27±0.09 0.26±0.09 0.38±0.22 0.56±0.42 0.73±0.25 0.65±0.33 
8.44±1.16 9.88±2.02 3.09±0.77 4.27±1.88 58.6±64.8 35.7±18.8 0.17±0.17 0.13±0.04 1.01±0.35 0.96±0.55 1.90±0.96 1.66±0.78 
1.5 5.18±0.94 7.25±2.57 0.96±0.43 2.15±1.64 195.2±129.8 78.8±32.6 0.18±0.17 0.14±0.06 5.59±6.71 2.78±4.07 4.85±2.88 3.47±1.57 
3.91±0.56 11.24±8.42 0.26±0.11 5.03±5.53 467.2±654.9 49.6±31.5 0.13±0.22 0.17±0.15 8.13±7.83 1.29±0.96 13.69±12.15 2.40±1.80 
2.5 3.05±0.37 8.98±3.88 0.04±0.03 3.44±2.22 460.9±253.3 79.6±118.9 0.02±0.01 0.13±0.08 12.67±8.14 1.11±0.80 21.79±7.92 2.31±1.32 

Values are means ± 1 S.D., N=7.

CF, cloacal fluid.

Total water gain = metabolic+preformed+free.

*

Birds fed 0.07 and 0.1 mol l-1 sucrose diets drank minimal supplementary water when available and lost substantial mass over 48 h. For this reason, trials were not repeated without supplementary water.

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