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Table 3.

Composition of air within the subelytral cavity, when sampled at different times during the discontinuous gas exchange cycle of CO2emission from the mesothoracic spiracle

Period of DGC cycleNVolume of CO2 (μl g-1)Maximum CO2(μl g-1)Percentage increase in water loss rate* (%)
Before burst period 16.19±6.98a 211.46±72.96a 75.6±8.4a 
During burst period 11 18.71±10.27a 269.19±141.86a 75.9±4.4a 
After burst period 18 8.24±5.38b 97.5±34.01b 71.2±1.8a 
Period of DGC cycleNVolume of CO2 (μl g-1)Maximum CO2(μl g-1)Percentage increase in water loss rate* (%)
Before burst period 16.19±6.98a 211.46±72.96a 75.6±8.4a 
During burst period 11 18.71±10.27a 269.19±141.86a 75.9±4.4a 
After burst period 18 8.24±5.38b 97.5±34.01b 71.2±1.8a 

DGC, discontinuous gas exchange cycle; SEC, subelytral cavity; CO2,CO2 partial pressure.

Values represent means ± S.D. N = number of samples taken during each period from recordings from five different beetles. Values in the same column followed by the same letter are not significantly different at P=0.05.

*

Percentage increase = (highest water loss rate sampled from subelytral cavity — water loss rate sampled from outer elytral case)/(highest water loss rate sampled from subelytral cavity) × 100.

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