Chapter 9 Opener: When a bull elk bugles, other males listen - PowerPoint PPT Presentation

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Chapter 9 Opener: When a bull elk bugles, other males listen. 1. What evolutionary events led to the developemtn of the pseudopenis in the female hyena?. The pseudopenis of the female spotted hyena can be erected. (1) Concentrations of testosterone in male and female spotted hyenas (Part 1).

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Chapter 9 Opener: When a bull elk bugles, other males listen

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Chapter 9 opener when a bull elk bugles other males listen l.jpg

Chapter 9 Opener: When a bull elk bugles, other males listen


1 what evolutionary events led to the developemtn of the pseudopenis in the female hyena l.jpg

1. What evolutionary events led to the developemtn of the pseudopenis in the female hyena?

  • The pseudopenis of the female spotted hyena can be erected


1 concentrations of testosterone in male and female spotted hyenas part 1 l.jpg

(1) Concentrations of testosterone in male and female spotted hyenas (Part 1)


1 concentrations of testosterone in male and female spotted hyenas part 2 l.jpg

(1) Concentrations of testosterone in male and female spotted hyenas (Part 2)


1 a cost of the pseudopenis for female spotted hyenas l.jpg

(1) A cost of the pseudopenis for female spotted hyenas

  • Length of the birth canal significantly increased. Size of pup determines survival, therefore evolutionary trade off between pup survival and benefits from testosterone induced aggression and dominance rank, ability to reproduce and dominance of pups.


1 competition for food among spotted hyenas may favor highly aggressive individuals l.jpg

(1) Competition for food among spotted hyenas may favor highly aggressive individuals


1 dominance greatly advances female reproductive success in the spotted hyena l.jpg

(1) Dominance greatly advances female reproductive success in the spotted hyena


2 describe possible evolutionary pathways for the developmetn of flight in stoneflies l.jpg

2. Describe possible evolutionary pathways for the developmetn of flight in stoneflies.

  • Arthropod gills have evolved into many different structures with different functions (Part 1)


2 arthropod gills have evolved into many different structures with different functions part 2 l.jpg

(2) Arthropod gills have evolved into many different structures with different functions (Part 2)


9 9 evolutionary precursors of insect wings l.jpg

9.9 Evolutionary precursors of insect wings?


9 10 a surface skimming stonefly l.jpg

9.10 A surface-skimming stonefly


9 11 a possible evolutionary pathway from swimming to full flight in the stoneflies l.jpg

9.11 A possible evolutionary pathway from swimming to full flight in the stoneflies


3 discuss the evolution of illegitimate signalers vs honest signalers l.jpg

3. Discuss the evolution of illegitimate signalers vs honest signalers.

  • .34 Deep croaks deter rivals – honest signal


9 36 convergent threat displays l.jpg

9.36 Convergent threat displays

  • Honest signal – contest winner gets the female


9 38 an honest signal l.jpg

9.38 An honest signal


9 39 a firefly femme fatale l.jpg

9.39 A firefly femme fatale

  • Illegitimate signal – huge benefits – why did this evolve? Why doesn’t evolution select against this type of behavior?


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