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Résumé
Tropical rain forests can be found today in each of the three land areas which occur within the tropical zone (Richards, 1952, 1996; Longman and Jenik, 1974; Flenley, 1979a; Whitmore, 1998) and, prior to the destructive effects of humans during the past century, as a result of which much of the rain forest has now been destroyed, occupied about one-third of the tropical land surface (Ewel, 1980; Mabberley, 1992).