Lecture 6 - Sexual Selection South Pacific, Island of new...

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Sexual Selection South Pacific, Island of new guinea, There are snakes that glide through the air, more human languages than Africa, lots of birds- Birds of paradise- descended from a bird that is similar to a crow. King bird of paradise, ribbon tailed astrapia has the longest tail of any other bird, red birds of paradise, blue bird of paradise, Wilsons bird of paradise- bald bright blue head, kind of Saxony bird of paradise Darwin asked can natural selection explain the evolution of elaborate traits in males? Elk horns, guppies have bright colors- increase being noticed by predators Many sexually dimorphic traits do not improve survival. Often these traits are expressed only during breeding season. Often they are not expressed in females or immature individuals. Birds of paradise- typically males are much more brightly colored. Displays- not only coloration but behavior. Sexual selection- differential reproductive success caused by competition for mates. – usually a struggle for males…. Operational sex ratio- the relative numbers of males and females available to breed at a given moment. Female that is pregnant is unavailable to reproduce. Males are available shortly after
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Lecture 6 - Sexual Selection South Pacific, Island of new...

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