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By Carlethia Brown Ecology Dr. Welch

By Carlethia Brown Ecology Dr. Welch. Mating Choice. Darwin 1871 Secondary characteristics Do not specifically take part in reproduction process 2 types or selection a)intersexual- mating because of particular characteristics b)intrasexual-same sex individuals compete for mates

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By Carlethia Brown Ecology Dr. Welch

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  1. By Carlethia Brown Ecology Dr. Welch Mating Choice

  2. Darwin 1871 Secondary characteristics Do not specifically take part in reproduction process 2 types or selection a)intersexual- mating because of particular characteristics b)intrasexual-same sex individuals compete for mates Natural Selection -predator influence Sexual selection -mate choice John Endler --2 experiments a) artificial ponds in a greenhouse at Princeton University b) field sites --# of greenhouse guppies increased when no predators were around --Decreased in ponds where a high number of predators were involved --proved that male guppies become more beautiful when not in the presence of things that will harm them (eat) Shaw University: Mate choice: Case histories

  3. Charles Darwin John Endler

  4. Astrid Kodrick-Brown (1993) • Male competition contributed to their mating success rate • Males mating success rate is determined by how beautiful the male is and how dominate he is • Attractive males are more dominate and do more flirting

  5. Scorpionflies and mate choice • Belong to the order Mecoptera • Group of insects closely related to moths and butterflies • Male is not harmful to humans • Few are alive • Observed by Randy Thornhill (19810 • Males fight over dead arthropods • Use the them to attract females • Secretes pheromone on dead arthropod to bring females close • Mates with her as she feeds on the arthropod • Larger males would be more successful in battle • Benefits the female • Avoid being eaten in efforts of capturing food • Reproductive advantage

  6. The End

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