increased homozygosity
increased homozygosity
increased homozygosity
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Intrasexual selection…<br />
Alternative male mating strategy: sneaky males<br />
e.g., many fish species<br />
e.g., dimorphism in male Rhinocerous beetles:<br />
Males that battle for and guard females<br />
vs.<br />
Small males that sneak into females’ tunnels<br />
Disruptive sexual selection on male morphology<br />
Three male mating strategies in lizard:<br />
a) ‘Ultradominant’: territory with multiple females<br />
b) Small, carefully guarded territory: 1 female<br />
c) No territory, sneak in on ultradominants<br />
negative frequency-dependent selection<br />
Side-blotched lizard<br />
Forms of intrasexual selection…<br />
2. Sperm competition:<br />
• Remove competitors’ sperm<br />
• Plug female genitalia following mating<br />
• Produce more sperm (larger testes)<br />
• Repeated matings<br />
Polygamous primates produce<br />
more sperm<br />
Damselfly penis has horn<br />
that removes other males’<br />
sperm<br />
Futuyma, Fig. 14.7<br />
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