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[email protected]. The University of Chicago Press, The American Society of Naturalists, The University of Chicago are collaborating with JSTOR to digitize, preserve and extend access to The American Naturalist. http://www.jstor.org Vol. 150, Supplement The American Naturalist July 1997 ALTRUISM AND ORGANISM: DISENTANGLING THE THEMES OF MULTILEVEL SELECTION THEORY David Sloan Wilson* Department of Biological Sciences, Binghamton University, State University of New York, Binghamton, New York 13902-6000 Abstract.—The evolution of groups into adaptive units, similar to single organisms in the coordi- nation of their parts, is one major theme of multilevel selection theory. Another major theme is the evolution of altruistic behaviors that benefit others at the expense of self. These themes are often assumed to be strongly linked, such that altruism is required for group-level adaptation. Multilevel selection theory reveals a more complex relationship between the themes of altruism and organism.