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Table 1.

Maximum metabolic rate (TMetMax) and regression coefficients of the relationship between temperature and log metabolic rate up to the TMetMaxat each of four oxygen concentrations in the isopod A. vulgare and the beetle G. simplex

TMetMax (ml CO2 h-1)
Oxygen concentration (%)MeanMinimumMaximumNRegression coefficient
Armadillidium vulgare      
   2.5 0.0403±0.0015A,1 0.0293 0.0469 10 0.0176±0.0082A,*,2 
   10 0.0550±0.0030B 0.0424 0.0703 10 0.0274±0.0012B 
   21 0.0576±0.0024B 0.0497 0.0731 0.0181±0.0010C 
   40 0.0794±0.0064C 0.0581 0.1156 10 0.0228±0.0013D 
Gonocephalum simplex      
   2.5 0.0733±0.0320A,3 0.0547 0.1320 10 0.0217±0.0005A,4 
   10 0.1554±0.0085B 0.1124 0.1920 10 0.0256±0.0007B 
   21 0.1495±0.0128B 0.0867 0.2219 10 0.0348±0.0015C 
   40 0.1724±0.0100B 0.1347 0.2317 10 0.0292±0.0011D 
TMetMax (ml CO2 h-1)
Oxygen concentration (%)MeanMinimumMaximumNRegression coefficient
Armadillidium vulgare      
   2.5 0.0403±0.0015A,1 0.0293 0.0469 10 0.0176±0.0082A,*,2 
   10 0.0550±0.0030B 0.0424 0.0703 10 0.0274±0.0012B 
   21 0.0576±0.0024B 0.0497 0.0731 0.0181±0.0010C 
   40 0.0794±0.0064C 0.0581 0.1156 10 0.0228±0.0013D 
Gonocephalum simplex      
   2.5 0.0733±0.0320A,3 0.0547 0.1320 10 0.0217±0.0005A,4 
   10 0.1554±0.0085B 0.1124 0.1920 10 0.0256±0.0007B 
   21 0.1495±0.0128B 0.0867 0.2219 10 0.0348±0.0015C 
   40 0.1724±0.0100B 0.1347 0.2317 10 0.0292±0.0011D 

Values are means ± s.e.m.

In all cases different letters denote significant differences in the values based on ANOVA or ANCOVA - Tukey's HSD test.

1

ANOVA F(3,35)=17.66, P<0.0001

2

ANCOVA for homogeneity of slopes F(3,2900)=7.952, P<0.0001

3

ANOVA F(3,36)=19.87, P<0.0001

4

ANCOVA for homogeneity of slopes F(3,6687)=36.319, P<0.0001

*

N=3; most other individuals showed a steady decline in metabolic rate with increasing temperature

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