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Unformatted text preview: "optimal" (see Life History Lecture). Optimal groups may evolve intermediate density by the same trade-off mechanism. A further problem for group selection: with localize population structure, there can be considerable inbreeding which increases relatedness (r). Thus inter "group" selection that gives the appearance of evolution of altruistic traits may be mediated by kin selection due to the high relatedness among individuals. Later we will consider species selection . Some lineages have more species than others, but are these lineages more fit? Is this simply a pattern (more species) or is it really a different process ? Is it simple like bacteria in chemostats: a higher birth/death ratio; some lineages seem to speciate faster than their members go extinct? Is this mediated at the level of the species, or can we explain it (as G. C. Williams might like) at the level of individuals within populations?...
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- Fall '10