Seasonal Variations in Food Supply for Wild Primates

During my different field studies on wild primates, I have been particularly impressed by the importance of seasonal variations, even for species living in a supposed 'stable' environment such as t he tropical rain forest. This might reflect that the annual variation in food supply, and the subsequent seasonal variations in the diet of the different species, is the common basis of primate feeding behaviour. Facing such variations has certainly been an important motor of evolution, and the measure of these variations among the extant species provides a basis to understand past and present selective pressures