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Table 6.

The rate of 51Cr-EDTA clearance from the haemolymph,extracellular fluid volume (ECFV), urine flow, water efflux and half-life of Gecarcoidea natalis during the 1997 wet season

Water efflux
Wet seasonClearance (ml kg−1 day−1)ECFV (% body mass)Urine flow (ml kg−1 day−1)t½(h)(ml kg−1 day−1)
Saline (control) 132.68±13.92 27.37±2.62 168.00±51.44 50.03±1.06 192.59±9.22 
Dopamine 165.81±9.26 33.34±1.65 146.04±26.60 51.44±1.58 228.77±19.52 
db-cAMP 187.15±17.98 33.19±1.94 179.73±23.91 44.44±2.41 226.63±5.47 
Serotonin 170.85±36.01 32.80±1.42 180.71±31.34 48.51±6.37 234.08±19.15 
Water efflux
Wet seasonClearance (ml kg−1 day−1)ECFV (% body mass)Urine flow (ml kg−1 day−1)t½(h)(ml kg−1 day−1)
Saline (control) 132.68±13.92 27.37±2.62 168.00±51.44 50.03±1.06 192.59±9.22 
Dopamine 165.81±9.26 33.34±1.65 146.04±26.60 51.44±1.58 228.77±19.52 
db-cAMP 187.15±17.98 33.19±1.94 179.73±23.91 44.44±2.41 226.63±5.47 
Serotonin 170.85±36.01 32.80±1.42 180.71±31.34 48.51±6.37 234.08±19.15 

The crabs were treated by infusion of either saline, dopamine, serotonin(both 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).

There was no significant effect of any pharmacological treatment.

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