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Table 5.

The osmolality (OP) and the concentration of Ca2+,Na+, Cl-, Mg2+, K+ and urate in the haemolymph of D. hirtipes sampled on Christmas Island

OP (mOsm)Concentration (mmol l-1)
Ca2+Na+Cl-Mg2+K+Urate
June (dry) Free ranging 501.1±22.0 5.0±0.4 264.4±6.0 264.8±6.9 3.8±0.5 5.2±0.1 0.093±0.011 
 5 min exercise 574.2±46.2* 9.1±1.2* 284.9±13.9 276.0±8.0 4.9±0.4* 7.5±0.3* 0.075±0.012 
February (wet) Free ranging 518.8±13.3 6.2±0.7 N/A N/A N/A N/A 0.121±0.027 
 5 min exercise 577.6* 10.6* N/A N/A N/A N/A 0.115±0.018 
OP (mOsm)Concentration (mmol l-1)
Ca2+Na+Cl-Mg2+K+Urate
June (dry) Free ranging 501.1±22.0 5.0±0.4 264.4±6.0 264.8±6.9 3.8±0.5 5.2±0.1 0.093±0.011 
 5 min exercise 574.2±46.2* 9.1±1.2* 284.9±13.9 276.0±8.0 4.9±0.4* 7.5±0.3* 0.075±0.012 
February (wet) Free ranging 518.8±13.3 6.2±0.7 N/A N/A N/A N/A 0.121±0.027 
 5 min exercise 577.6* 10.6* N/A N/A N/A N/A 0.115±0.018 

The OP, Ca2+ and urate were measured for crabs sampled during the dry season of 1994 or during the wet season, while Na+,Cl-, Mg2+ and K+ were determined for crabs sampled in the dry season. The crabs were sampled either during their normal behaviour or after 5 min exercise (N>8). Values are means ± s.e.m.

*

Significant effect of exercise

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