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Table 1.

The osmotic pressure and concentration of major ions in the haemolymph and urine of Gecarcoidea natalis in the rainforest during the wet season (February 1997)

Haemolymph
Urine
Free rangingConfinedFree rangingConfined
Osmotic pressure (mOsm) 753.3±28.3 798.8±6.0 768.7±30.2 816.4±6.2 
Na (mmol l−1338.3±23.4 331.3±6.7 302.8±14.4 269.6±9.6 
K (mmol l−16.1±0.4 5.9±0.9 5.9±0.7 6.3±0.8 
Mg (mmol l−16.6±0.5 5.7±1.2 5.6±0.6 5.9±1.4 
Cl (mmol l−1315.5±11.7 316.3±4.7 299.3±10.7 386.0 *±5.3 
Ca (mmol l−118.4±0.9 16.8±1.2 9.5 ±1.3 16.1 *±2.0 
Haemolymph
Urine
Free rangingConfinedFree rangingConfined
Osmotic pressure (mOsm) 753.3±28.3 798.8±6.0 768.7±30.2 816.4±6.2 
Na (mmol l−1338.3±23.4 331.3±6.7 302.8±14.4 269.6±9.6 
K (mmol l−16.1±0.4 5.9±0.9 5.9±0.7 6.3±0.8 
Mg (mmol l−16.6±0.5 5.7±1.2 5.6±0.6 5.9±1.4 
Cl (mmol l−1315.5±11.7 316.3±4.7 299.3±10.7 386.0 *±5.3 
Ca (mmol l−118.4±0.9 16.8±1.2 9.5 ±1.3 16.1 *±2.0 

Crabs were either free ranging in the rainforest or held within open-topped enclosures that allowed rainfall to enter and contact with the forest floor. Values are means ± s.e.m. (N=8-12 in each group).

*

, significantly different to free-ranging crabs at P<0.05;

, urine significantly different to haemolymph at P<0.05.

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