BIOL 304 Lecture Notes - Lecture 8: Annual Plant, Fitness Landscape, Divergent Evolution
5 Mar 2018
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Q&a session monday 1pm-2pm/2pm-3pm in hendry office! (room 205) Natural selection and adaptive divergence: natural selection in interacting populations, environments are different so populations evolve in different ways. Methods for inferring adaptive divergence and (presumably) fitness peaks on an adaptive landscape: phenotype/environment correlations, reciprocal transplant experiments, divergent selection on specific traits, experimental evolution (eg introductions, phenotypic manipulations, comparisons to neutral expectations. Phenotype/environment correlations example from bears and salmon: salmon in alaska, bears eat the salmon, different locations have different probability of being eaten by a bear. Intensity of predation vs depth of water deep water, bears kill almost no spawning salmon and kill many in shallow water. If a salmon has a deep body in shallow water, bears will easily catch you. I(cid:374) deep (cid:449)ater, (cid:271)od(cid:455) size does(cid:374)"t affe(cid:272)t predatio(cid:374) (cid:271)ut it is preferred that (cid:373)ales ha(cid:448)e deep body by females: causes shallower bodies in shallow water and deeper bodies in deeper water, especially for males.
