lecture 15 - Sexual Dimorphism Sexual dimorphism is the...

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Unformatted text preview: Sexual Dimorphism Sexual dimorphism is the existence of physical differences between the sexes, other than differences in the sex organs Why? Males compete for females Alterations affect their ability to: Fight Be noticed Find females Antennae Males of many insect species have antennae that are more elaborate than females Function Males have more surface area on each antenna More surface area = more sensory capability Male moths find females by following a pheromone plume emitted by the female Sensitive males find the female first Disruptive Selection i.e., selection against the mean Females have skinny antennae; no need for expensive plumose ones Males with plumose antennae fine females first Male mosquitoes have more plumose antennae, respond solely to frequency of female wingbeat Again, sensitive males find the female first Dimorphism in ornamentation Hercules and rhinoceros beetles Stag beetles Lucanus spp. What is the benefit of exaggerated dimorphism?What is the benefit of exaggerated dimorphism?...
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lecture 15 - Sexual Dimorphism Sexual dimorphism is the...

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