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Table 4.

Sodium turnover in Gecarcoidea natalis free-ranging or confined within field enclosures in the rainforest on Christmas Island in 1997

Dry season
Wet season
ConfinedFree rangingConfinedFree ranging
Sodium space (% initial mass) 37.8±3.91f 34.3±2.18e 30.71±1.10 26.46±1.81e,f 
t½ (day−111.91±1.58a 8.68±2.28 8.20±1.41 5.54±0.51a 
Rate constant (day−10.0581±0.0090b 0.0876±0.0288 0.0990±0.0141 0.1320±0.0113b 
Total body sodium (mmol) * 30.43±1.70c,h 36.44±2.96c,d,h 24.78±2.21d 16.53±4.01h 
Sodium efflux (mmol kg−1 day−18.37±1.67 11.45±2.01 9.82±1.66 10.58±1.03 
Dry season
Wet season
ConfinedFree rangingConfinedFree ranging
Sodium space (% initial mass) 37.8±3.91f 34.3±2.18e 30.71±1.10 26.46±1.81e,f 
t½ (day−111.91±1.58a 8.68±2.28 8.20±1.41 5.54±0.51a 
Rate constant (day−10.0581±0.0090b 0.0876±0.0288 0.0990±0.0141 0.1320±0.0113b 
Total body sodium (mmol) * 30.43±1.70c,h 36.44±2.96c,d,h 24.78±2.21d 16.53±4.01h 
Sodium efflux (mmol kg−1 day−18.37±1.67 11.45±2.01 9.82±1.66 10.58±1.03 

Measurements were carried out in both the west season (February) and dry season (June). Values are means ± s.e.m.(N=8−12 in each treatment). Values sharing similar superscript letters were significantly different at P<0.05 (note that ANOVA of sodium efflux was P=0.21).

*

Scaled to 250 g body mass; see Greenaway(1994) for mass scaling exponent.

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