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Sex and Mating!!!!

Sex and Mating!!!!. By Tim Revell. Life Cycle of an Animal. Another one…. Decision?. Honest Signals?. Who gets to choose??. Robert Trivers Parental investment = higher, the more “choosier” sex The other hypothesis? Sex Ratio 1:1 Operational Sex Ratio. Honest signals?.

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Sex and Mating!!!!

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  1. Sex and Mating!!!! By Tim Revell

  2. Life Cycle of an Animal

  3. Another one….

  4. Decision?

  5. Honest Signals?

  6. Who gets to choose?? • Robert Trivers • Parental investment = higher, the more “choosier” sex • The other hypothesis? • Sex Ratio 1:1 • Operational Sex Ratio

  7. Honest signals?

  8. But not always the female… • Male Katydid - spermatophore • Male Frog • Females

  9. But can things get out of control?

  10. Theories to explain extreme traits..

  11. Sexual Selection

  12. Mating Systems • Result from the strategies that males should do vs. those females should do

  13. Mating Systems (Basics).. • Monogamy = Basically one male with one one female • Polygamy: Multiple mates…. • Polygyny = One male tries to mate with multiple females (males generally compete for access to females). • Polyandry = One female attempts to mate with multiple males (females generally compete for access to males).

  14. Examples of Mating Systems • Monogamy-Mate-guarding = rare to find a mate (Clown Shrimp)

  15. Examples of Mating Systems • Monogamy – Female assistance (California mouse) helps keep the pups warm

  16. Examples of Mating Systems • Polyandry – Good Genes or Fertility Insurance with EPC(Male Yellow Toothed Cavy)

  17. Examples of Mating Systems • Polyandry –Good Genes or Fertility Insurance with EPC (blue throat)

  18. Examples of Mating Systems • Polygyny - Female Defense(Marine amphipod) – “apartment complex” of females

  19. Examples of Mating Systems • Polygyny - Resource Defense (African cichlid)

  20. Examples of Mating Systems • Polygyny - Lek(No Resources = Marine Iguana and Sage Grouse)

  21. But What if you are not the best… • Sperm Competition…Satelite males and female mimicry • Bluegill sunfish – 3 different egg fertilization behaviors

  22. But what if you are not the best… • Sperm Competition…sperm removal • Black-winged damsel fly

  23. But what if you are not the best…

  24. But what if you are not the best… • Sperm Competition…Sperm injection • Bed Bugs

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