Thermal response expressed as a fraction of the maximum dry matter production) of a leaf canopy for plant communities dominated by temperate C3, tropical C3 and tropical C4 species (after Fitzpatrick Nix 1970; Sweeny& Hopkinson 1975) 1.O) 8 a.0.6 2o.4 0.2 10 20 30 MEAN DAILY TEMPERATUREThermal response expressed as a fraction of the maximum dry matter production) of a leaf canopy for plant communities dominated by temperate C3 , tropical C3 and tropical C4 species (after Fitzpatrick & Nix 1970; Sweeny & Hopkinson 1975)