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Succession in Abandoned Fields Förderungs- und Betriebs GmbH The hematopoietic system plays rolesOld and New Fields of Old Field Ecology In ecology, succession occupies a place similar to that of evolution in general biology. Ram6n Margalef, 1968. It was a great honor for me to have been asked by Marinus Werger to write an introductory note to this very special volume. Presumably my friends and former students in Europe felt that a few words from the New World might put the results presented in this exciting book into a somewhat broader