BIO220H1 Lecture 3: Lecture 3 Sexual Selection and Female Choice

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11 Feb 2012

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Lecture 3 bio220 sexual selection and female choice: satin bowerbird decorates a bower to attract females, sage grouse in leks to set up displays. 4 treatments: n natural, r reduced, l elongated, s sham surgery (control: cut off tail, and glue back on same bird) Female preference of eyespots in peacocks: measure copulation frequency and eyespots, reduced eyespot number caused large decrease in population frequency. 1 chuck: whine (initial attraction, lure, multiple chucks. Frog-eating bat also attracted: mating success vs. predation/survivorship. Indirect benefits: high genetic quality, higher fitness offspring. Parental investment theory: sex that invests little in offspring compete to mate with sex that invests more in offspring. Sex role reversal in pipefish and katydids: high male parental investment, male choice, female-female competition. Sexual selection on female size and ornamentation (color). Increased female length, increased fold size, increased preference by males. Mate choice based on differences in odor that corresponds with differences in mhc.

Related Questions

a) Why might selection have favored the preference female sage grouse have for the male sage grouse mating display? That is, what might males be signaling with this behavior, and why might it be in a femaleâs interest to choose a male based on his display?

b) What is the name of the mating system exhibited by great crested grebes, and what may have been one selective factor explaining why it evolved?

C) Propose a different hypothesis for why selection might have favored the preference female bowerbirds exhibit for blue coloration. (Isn't the reason why bowerbirds prefer the blue coloration is because it may be similar in color as to one of their resources attracting female bowerbirds to mate with them?)

- can someone also check if my answer to this question is correct (letter d).

d) Propose a hypothesis for why selection might have favored the preference females have for bower-building in male satin bowerbirds? That is, what might males be signaling with this behavior, and why might it be in a femaleâs interest to choose a male based on his display?

Bower building males signal females that their nest is the most suitable to lay their eggs and reproduce. It would be in the females best interest to choose a bowerbird with the best bower build because it is a preference that has been passed on in the species and by doing so its offspring will also choose intricate bower building mates.

lemoncheetah578

Chinese Water Deer have elongated canines that are believed to be used in male to male combat during the breeding season. What is the name for this type of anatomical feature and what type of selection promotes its evolution (be specific).

Describe with an example one potential direct benefit of female choice in mating systems

GnRH, LH, FSH, and inhibin are present in both males and females. Describe the function of each of these hormones in both males and females. How is each hormone regulated in males and females?

GnRH = gonadotrophin-releasing hormone

LH = lutropin or Luteinizing hormone

FSH = Follicle-stimulating hormone

BIO220H1 Lecture 3: Lecture 3 Sexual Selection and Female Choice

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