BIO220H1 Lecture Notes - Lecture 18: Satin Bowerbird, Natural Selection, Hangingfly
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Bio220 lecture 18: sexual selection and mate choice. Strong sexual selection in traits with the sex that has the highest reproductive variance. High reproductive variance = males for example, male gametes are an excess compare to female eggs because they have so many of them. And not all of their gametes get fertilized with limited eggs, thus, this creates variance in males that reproduce/ not reproduce. When both male/female contributes equally to parental care, less sexual dimorphism. When male contributes more to parental care, we might see sexual dimorphism in female, as they are trying to get access to male to mate. Male birds choose a spot and display/dance to attract female. Successful male tends to be in the center of the lek. All parental care from female male have high sexual dimorphism. Birds that build bower, and decorate it with blue objects. Female goes from bower to bower choosing their mate.
