Social boundaries separate us fromthem. Explaining the formation, transformation, activation, and suppression of social boundaries presents knotty problems. It helps to distinguish two sets of mechanisms: (1) those that precipitate boundary change and (2) those that constitute boundary change. Properly speaking, only the constitutive mechanisms produce the effects of boundary change as such. Precipitants of boundary change include encounter, imposition, borrowing, conversation, and incentive shift. Constitutive mechanisms include inscription–erasure, activation–deactivation, site transfer, and relocation. Effects of boundary change include attack–defense sequences. (...) These mechanisms operate over a wide range of social phenomena. Key Words: social boundary • mechanisms. (shrink)

Here we attempt to define a specifically human ecology within which male reproductive strategies are formulated. By treating the domestic and public spheres of social life as "ecological niches" that men have been forced to compete within or to avoid as best they can, we generate a typology of four "social modes" of human male behavior. We then attempt to explain the broad distribution of social modes within and between human groups based on the relative intensity of scramble and contest (...) competition. (shrink)