Why would females choose “flashy”?. Gray tree frogs.

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Presentation transcript:

Why would females choose “flashy”?

Gray tree frogs

Do long calls indicate good genes?

Do long calls indicate good genes? yes

Runaway sexual selection?

Fisherian Runaway Selection The notion that sexual selection is more rapid than natural selection and that it can lead to evolution of great extravagances that are detrimental

Male red-collared widow bird

Antlers are secondary sexual characteristics… Use varies by species: Visual display of dominance Fighting Mate attraction Extinct 11,000 years ago

Irish Elk—extinct Crazy-big antlers, right? “Runaway Sexual Selection”? Or not…

˄ Why the Irish Elk went extinct… Not

Note axes = log scale M = Megaloceros X axis = 200 mm increase Y axis = 1000 mm increase Not a 1:1 ratio of increase! Irish Elk had antlers exactly the right size for their bodies Runaway sexual selection could not have been the cause of their extinction!

Endler Experiment Without predator, sexual selection is the driving force

Endler Experiment With predator, sexual selection is tempered

Discussion Why are females often drab? Why don’t males prefer flashy females?