Multilevel Selection On Mating Success In Water Striders

In the past several weeks I have been discussing how multilevel selection was very common in plants.  Of course, we should not be surprised that multilevel selection would be important in plants, since they are sessile, and often have limited gene flows.  Thus, they are forced to interact with a consistent set of partners, and […]

Selection in Impatiens: Moving beyond correlation

Last time I reviewed our study of contextual analysis in Impatiens capensis.  We came up with a standard result, and drew a radical conclusion.    The standard result is that Impatiens obeys the constant yield rule that Harper claims is nearly universal, and a result that had been seen in the past (e.g., Schmitt, Eccleston and […]

Multilevel Selection In Impatiens

Last week’s post was bit of a set up.  To reiterate I made the point that lab selection experiments really tell us about the ability of population to respond to imposed group selection, and the one early study on group selection in nature did not provide a convenient protocol that could be easily extended to […]

Lab and Field Experiments of Group Selection

Late as usual.  I think I will not be able to keep up the weekly posting.  This week I want to talk a little about what why we do group selection experiments, and what they tell us about group selection in nature. In a standard laboratory group selection experiment several sets of metapopulations are set […]

Contextual analysis and Hamilton’s rule

After another brief hiatus to talk about religion, lets return to contextual analysis.  As I have pointed out several times contextual analysis uses the same equation as the direct fitness approach of kin selection.  This implies that we can re-capture Hamilton’s rule using contextual analysis. Hamilton’s rule is the center of kin selection.  In one […]