lecture 20 - Mating Courtship Behaviors and Reproductive...

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Unformatted text preview: 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!! 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 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 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 – One or both sexes perform them...
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This note was uploaded on 02/27/2010 for the course ENTOMOLOGY ent 104 taught by Professor Edwinlewis during the Spring '10 term at UC Davis.

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lecture 20 - Mating Courtship Behaviors and Reproductive...

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