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Table 5.

The rate of 51Cr-EDTA clearance from the haemolymph,extracellular fluid volume and body mass (% loss) of Gecarcoidea natalis during the 1997 dry season

51Cr-EDTA clearance (ml kg−1day−1)
Extracellular fluid volume (% body mass)
Change in body mass (%)
Dry SeasonWaterNo waterWaterNo waterWaterNo water
Saline 130.02±12.10 90.57±4.88  19.15±0.76 19.00±0.85 3.61±0.74 3.70±0.91 
Dopamine 123.44±5.62 93.25±5.84  22.94±1.69 20.05±0.92  3.24±0.83 3.60±0.78 
db-cAMP 125.32±14.07 103.20±16.8  21.99±1.57 17.60±0.48  4.24±0.57 4.06±0.51 
Serotonin 151.11±10.72 * 108.72±13.36 *,  21.29±0.99 17.69±1.36 4.50±0.82 4.00±0.83 
Octopamine 123.16±7.37 90.33±9.26  19.22±1.08 20.31±0.81 4.43±0.46 3.90±0.80 
51Cr-EDTA clearance (ml kg−1day−1)
Extracellular fluid volume (% body mass)
Change in body mass (%)
Dry SeasonWaterNo waterWaterNo waterWaterNo water
Saline 130.02±12.10 90.57±4.88  19.15±0.76 19.00±0.85 3.61±0.74 3.70±0.91 
Dopamine 123.44±5.62 93.25±5.84  22.94±1.69 20.05±0.92  3.24±0.83 3.60±0.78 
db-cAMP 125.32±14.07 103.20±16.8  21.99±1.57 17.60±0.48  4.24±0.57 4.06±0.51 
Serotonin 151.11±10.72 * 108.72±13.36 *,  21.29±0.99 17.69±1.36 4.50±0.82 4.00±0.83 
Octopamine 123.16±7.37 90.33±9.26  19.22±1.08 20.31±0.81 4.43±0.46 3.90±0.80 

The crabs were treated by infusion of saline, dopamine, serotonin,octopamine (all at 10−10 mol g−1) or db-cAMP(10−9 mol g−1). Infusions in saline carrier at 1 μ1 g−1 were performed at 8 h intervals for 3 days. Crabs were held within enclosures that were open at the top and allowed crabs contact with the forest floor. Values are means ± s.e.m.(N=12 in each group).

*

, effect of drug;

, effect of removing drinking water. Extracellular fluid volume was measured from EDTA space, expressed as % body mass. The change in % body mass was tested by ANOVA of the arcsin-transformed values; there were no significant differences between the values.

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