... 1978 ; Medina and Min-chin, 1980 ; Francey and Farquhar, 1982 ;Medina et al, 1986 ; Gebauer and Schulze,1991). In the present study, different lightregimes and associated ... Dordrecht,247-257Medina E, Minchin P (1980) Stratification of δ13C values of leaves in Amazonian rain fo-rests. Oecologia 45, 377-378Medina E, Montes G, Cuevas E, Roksandic ... Profiles of CO2 concentration and of δ13C values in tropical rainforest of the upperRio Negro Basin, Venezuela. J Trop Ecol 2,207-217Nambiar EKS (1990) Interplay...