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Lecture 15B Slides

Lecture 15B Slides - Energetic cost of reproduction in...

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3/10/09 1 What does differential parental cost/ investment tell us about how sexual selection acts? Bateman’s principle Energetic cost of reproduction in males is low, relative to females Sperm is cheap relative to eggs (anisogamy) Male’s reproductive success limited by # of mates, not by sperm production Female’s reproductive success is limited by egg production, not by the number of mates Therefore, males should compete for mates; females should be choosy about mates. A. Male-male competition (intrasexual selection) for access to females – Leads to large size, antlers, and other features useful in ritualized or real battles among males – winners gains access to resources (territories), mates B. Female choice (intersexual selection) leads to ornamentation of males C. Female choice - why do females choose what they choose? C. Female choice - why do females choose what they choose? 1. Acquisition of resources 2. Good genes hypothesis 2. Runaway selection
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