1. Chapter 9 – Evolution of Communication
Biology 484 – Ethology
Chapter 9 – Evolution of Communication

2. Chapter 9 Opener: When a bull elk bugles, other males listen
Communication can be between individuals,
groups, or even different species.
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3. 9.1 The pseudopenis of the female spotted hyena can be erected
The female spotted hyena displays her pseudopenis in an erect state as a form of greeting ceremony.
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4. 9.2 Concentrations of testosterone in male and female spotted hyenas (Part 1)
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5. 9.2 Concentrations of testosterone in male and female spotted hyenas (Part 2)
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6. 9.3 A cost of the pseudopenis for female spotted hyenas
The pseudopenis in the female may be helpful in certain species specific forms of communication, but it results in a high cost associated with reproduction.
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7. the aggression hypothesis is currently best supported.
9.4 Competition for food among spotted hyenas may favor highly aggressive individuals
In a comparison of the extra androgen hypothesis and the aggression hypothesis,
the aggression hypothesis is currently best supported.
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8. 9.5 Dominance greatly advances female reproductive success in the spotted hyena
The higher the mother’s social status, the greater the survival of her offspring.
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9. 9.6 Ultrasonic communication
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The male whistling moth communicates via ultrasonic calls produced by striking hard, knobby “castanet” wing structures together.

10. 9.7 Evolution of a sensory system
The area of the sensory nerve labeled as “b1” shows the difference between the two moths.
The saturniid “b1” innervates to relay information about the hindwing.
The noctuid moth, which *can* hear, uses the “b1” to innervate to the tympanic membrane to conduct vibratory sound to the CNS.
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11. 9.8 Arthropod gills have evolved into many different structures with different functions (Part 1)
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12. 9.8 Arthropod gills have evolved into many different structures with different functions (Part 2)
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13. 9.9 Evolutionary precursors of insect wings?
This extinct insect (a stonefly like insect) may be providing a clue to how the gill plates may have evolved into wings in many forms of insects.
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14. 9.10 A surface-skimming stonefly
This particular species of stonefly displays wings, but the wins are not for flight in the traditional sense. Instead, it uses the wings somewhat like how we use a sail on a sailboat. It is used to capture wind and propel the insect along the surface.
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15. 9.11 A possible evolutionary pathway from swimming to full flight in the stoneflies
Different species of stonefly with different possible velocities show a possible mechanism for evolution of flight.
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16. 9.12 An ancestral signal has been co-opted in some bowerbirds
“Skraa” is the signal that originated for aggression but has been used for other activities as well in some species.
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17. 9.13 Sensory exploitation and the evolution of a courtship signal in Neumania papillator
The water mite female sits in a predatory position while the male moves its leg to create vibrations like a prey item.
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18. 9.15 A female cichlid fish (left) is attracted to the anal fin of a male by the orange spots on the fin
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19. Parental Care Behaviors in the convict cichlid, Chiclosoma nigrofasciatum:
Mouthing
Spitting
Finding
Digging
Feeding
Aggressive Behavior to Mate
Attack Conspecifics
Fanning
Hovering
None of the Above

20. 9.16 Food, carotenoids, and female mate preferences in the guppy
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21. 9.17 Sexual preferences for orange spots match foraging preferences by female guppies
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22. 9.18 The response of least auklets to three novel artificial signals
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23. 9.19 Receivers can respond to an ancestral signal not present in their species
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24. 9.20 Sensory exploitation and swordtail phylogeny
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25. 9.21 Mate preferences for a novel ornament
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26. 9.22 The panda principle is evident in the sexual behavior of a parthenogenetic whiptail lizard
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27. 9.23 A group of ravens feeding on a carcass to which they were attracted by a yelling companion
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28. 9.24 Yelling is a recruitment signal
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29. 9.25 Predation risk has affected the evolution of begging calls in warblers (Part 1)
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30. 9.25 Predation risk has affected the evolution of begging calls in warblers (Part 2)
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31. 9.26 Testosterone affects begging rate and feeding rate in black-headed gull chicks
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32. 9.27 An honest signal of hunger?
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33. 9.28 The European cuckoo chick’s begging call matches that of four baby reed warblers (Part 1)
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34. 9.28 The European cuckoo chick’s begging call matches that of four baby reed warblers (Part 2)
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35. 9.29 The cuckoo’s begging calls stimulate more frequent feeding by its host parents
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36. 9.30 Illegitimate receivers can detect the signals of their prey (Part 1)
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37. 9.30 Illegitimate receivers can detect the signals of their prey (Part 2)
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38. 9.31 Great tit alarm calls
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39. 9.32 Hearing abilities of a predator and its prey
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40. 9.33 Convergent evolution in a signal
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41. 9.34 Deep croaks deter rivals
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42. 9.35 Threat displays are energetically demanding in the side-blotched lizard (Part 1)
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43. 9.35 Threat displays are energetically demanding in the side-blotched lizard (Part 2)
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44. 9.36 Convergent threat displays
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45. 9.37 Antler span in two New Guinean fly species provides accurate information about body size
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46. 9.38 An honest signal
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47. 9.39 A firefly femme fatale
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48. 9.40 A deceptive signaler
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