feb 29 handout - 2/28/2012 Mating, Courtship Behaviors and...

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2/28/2012 1 Mating, Courtship Behaviors and Reproductive Isolation Ips Bark Beetle Life History • Male adults are the colonizing sex • Females land on trees after males construct nuptial chambers • When females attempt to enter chamber, males assess them • Unusual male-choice system!!
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2/28/2012 2 Male mating systems Mate monopolization is the ability of individuals of one sex to garner and maintain exclusive access to members of the other sex • In general, the potential for monopolization is high when resources (food or mates) are predictable in space or time. Female systems • Monogamy • Polyandry – Sperm replenishment – Material benefit Tenebrio molitor
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2/28/2012 3 T. molitor mating Mating Frequency T. molitor mating Benefits of mating more than once • Produce more fertile eggs – Sperm limited – Seminal fluid stimulates oviposition • Nutrition – Not in this system • If mate with >1 male, offspring variability goes up
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2/28/2012 4 Courtship Behaviors • Evolutionary basis for ritualistic courtship behaviors – Sexual Selection – Natural Selection – Reproductive Isolation An Example in Insects • Courtship often consists of a stereotyped set of behaviors – Always performed in the same sequence
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feb 29 handout - 2/28/2012 Mating, Courtship Behaviors and...

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