BIOL3044 Lecture Notes - Lecture 13: Statistical Power, Directional Selection, Stabilizing Selection
Document Summary
The strength of phenotypic selection in natural populations: j. g kingsolver, et al. A lot of studies largely based on genetic demography approach was pulled together. The studies were longitudinal (followed individuals through time, who survived, who doesn"t, who produces offspring) and cross-sectional (compare juveniles to adults at one time: not as many were cross-sectional, most were longitudinal. Frequency: what fraction of the studies obtained certain values of the linear selection gradient ( , the slope of linear line: ex. Fraction of studies that obtained a of 0. 75. This graph has values broken up in morphology and life history/phenology: also very similar, no particular tendency for selection by morphology to be stronger than selection by life history/phenology. It is unsure if this is legitimate we assume life history traits are under stronger selection, although there"s the possibility that they are under stronger selection but they have less variation, making it harder to detect that selection.
