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Unformatted text preview: ences. However, if the mimic becomes too abundant, predators may cease to avoid both
model and mimic, since now encounters often lead to palatable prey. This relaxation in the avoidance of
striking patterns may be due to the predators’ learning not to avoid them anymore, or to natural selection
favoring predators that do not avoid the often–palatable prey. In either case, there may be frequency–
dependent selection: mimics may be favored when rare, but disfavored when common. Note that the model
also suffers when the mimic becomes too common.
In this lab, we will test 3 hypotheses related to the above problem.
(1) The aposematism hypothesis states that the model benefits from advertising its distastefulness with striking
coloration patterns. This hypothesis predicts that the model will have higher survivorship (lower
predation) than palatable, non–striking species.
(2) The mimicry hypothesis states that the mimic benefits from resembling the model. This hypothesis predicts
that the mimic will have higher survivorship than palatable, no...
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This document was uploaded on 03/25/2014 for the course BIO SCI 310 at Wisconsin Milwaukee.
- Spring '14