The levels of selection problem was central to Maynard Smith’s work throughout his career. This paper traces Maynard Smith’s views on the levels of selection, from his objections to group selection in the 1960s to his concern with the major evolutionary transitions in the 1990s. The relations between Maynard Smith’s position and those of Hamilton and G.C. Williams are explored, as is Maynard Smith’s dislike of the Price equation approach to multi-level selection. Maynard Smith’s account of the ‘core Darwinian principles’ (...) is discussed, as is his debate with Sober and Wilson (1998) over the status of trait-group models, and his attitude to the currently fashionable concept of pluralism about the levels of selection. (shrink)

E. O. Wilson (1974: 54) describes the problem that social organisms pose: “On what bases do we distinguish the extremely modified members of an invertebrate colony from the organs of a metazoan animal?” This framing of the issue has inspired many to look more closely at how groups of organisms form and behave as emergent individuals. The possible existence of “superorganisms” test our best intuitions about what can count and act as genuine biological individuals and how we should study them. (...) As we will discuss, colonies of certain organisms display many of the properties that we usually reserve only to individual organisms. Although there is good reason to believe that many social insects form genuine emergent biological individuals, the conclusion offered here is of a slightly different sort. I will argue that to understand some social insects' interactions and the emergent traits they give rise to, it may be helpful to shift our understanding from a community-level approach to an ecosystem-level approach. I will argue that viewing certain insect colonies (termites) as parts of ecosystems allows us to better understand some of the adaptations that have emerged from their evolution. (shrink)

This paper examines the empirical aspect of the debates over group selection. I argue that specific narrow readings of the notion of ‘group’ result in a deficient experimentation of the group selection process. Criteria for empirical testability are presented and used to reexamine two well-known experiments of group selection. I argue that the former holds a narrow image of ‘group’ that does not distinguish group selection from selection at other levels; while the latter holds a multifaceted image of ‘group’ that (...) offers a way to achieve substantive progress in the debate. However, most supporters and opponent of group selection maintain a narrow and restricted image of ‘group’, which implicitly undermines informative details regarding population dynamics and population structure. These details may improve our understanding of the evolution of altruism and the evolution of sociality. To conclude, adopting a wide-ranging meaning of ‘group’ may empirically advance the group selection debates. (shrink)