Fig. 4.

Trends in total cultivated area and in the extra cultivated land required to compensate for the deficits in crop production in the absence of animal pollination (i.e. area compensation) for the developed and developing world 1961–2006. Area compensation was estimated assuming that the pollinator dependence of individual crops was represented by the mid-value of the range defining its corresponding dependence class (average-area compensation) and by the lower limit of that range (minimum-area compensation).