lecture 16 - Happy Birthday Mating Systems • Polygyny...

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Unformatted text preview: Happy Birthday Mating Systems • Polygyny : males mate with more than one female in a lifetime • Monogamy : males and females mate with only one individual of the opposite sex in a lifetime • Polyandry : females mate with more than one male in a lifetime Plecia nearctica Diptera: Bibionidae Love bugs – males hover to capture emerging females Intra-sexual selection “Ardent” males Sperm competition – prevent other males sperm from fertilizing eggs Spermatheca Sperm removal, genital cement, anti-aphrodisiac scents Single mating event (monogamy) vs. Multiple mating, guarded in copula Sperm competition in Odonates • Sperm precedence occurs when most of a female’s eggs are fertilized by the sperm of only one of the males with which she has mated-usually the last male Cimicidae – Bed Bugs Traumatic Insemination • Male has “hypodermic genitalia” • Pokes through female cuticle • Inject sperm • Sexual Selection? Xylocorris maculipennis Males pierce female, inject sperm into body cavity, some fertilize eggs Males may also pierce other males, who then fertilize with the piercing males sperm Anti-aphrodisiac scents Heliconius erato Males deposit scents on females at end of mating, similar to a territorial scent used to repel other males Intra-sexual selection “Ardent” males Depleted copulation In some parasitoid species, males produce a limited quantity of sperm, but will continue to mate after depleted Inter-sexual selection Choosey females Non-genetic benefits (direct benefits) Quality territories for young Resources Nuptial gifts Anti-predatory chemicals Spermatophore:...
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lecture 16 - Happy Birthday Mating Systems • Polygyny...

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