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Fig. 3. The CO₂ emission rates from the mesothoracic spiracles and elytral case as a function of total CO₂ emission in four dung beetle species. The regression equations, for which there is a significant correlation, are given for each species, where: m, mesothoracic spiracular _CO2; el, elytral case _CO2; and t, total _CO2. For P. femoralis: el=0.022+0.88t, r²=0.78, P=0.048. For S. gariepinus: el=–0.003+0.85t, r²=0.96, P=0. For S. striatum: m=–0.058+1.52t, r²=0.78, P=0.02. For C. bacchus: m=–0.021+0.86t, r²=0.98, P=0.002.

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