Popular in Introduction to Insect Behavior
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This 4 page Study Guide was uploaded by Heidi Jones on Sunday March 20, 2016. The Study Guide belongs to ENTM 21000-001 at Purdue University taught by Linda Mason in Spring 2016. Since its upload, it has received 26 views. For similar materials see Introduction to Insect Behavior in Entomology at Purdue University.
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Date Created: 03/20/16
Anisogamy "inequality in gametes" Males: many, small gametes; females: few, large gametes Anisogyny Driver of male polygyny male applies chemical that makes Anti-aphrodisiac femal unattractive to other males Asexual reproduction Passes 100% of genes to next generation Bateman's principle nearly all females have a mate but some males will not have a mate Cooperational Until 1975 reproduction viewed as: Displacement of sexual male calls female, but another male interrupts or distractrs the call with a signals sound or pheromone Epideictic behavior holding back on reproduction ex. Wynn-Edwards' starlings Epigamic selection Choice of mate; typically females choose the male female defense polygyny harems; females clustered; ex. fur seals Female guarding males give up polygyny (other matings) to stay with and protect female from other males. Hilltopping females fly to prominence, followed by males Female can determine whether egg will Hymenoptera be male(haploid) or female(dipoid) by whether it is unfertilized or fertilized Induce unreceptivity male applies chemical that makes female unreceptive to other males Insect sperm long lived and little is wasted Intrasexual selection Selection within a sex: competition of (ususally) males for females males assemble to display for Lek polygyny females; ex. hawaiian drosophila Limiting resource In parental investment, the sex with the greater parental investment Male/female Interface causing coevolutionary change Male fitness Anisogamy: limited by number of females a male can mate with reduce sperm competition; prevent Mating plugs female from laying eggs unless female has 2 genital openings Monogamy Sex ratio biased towards males so male stays with female; unless females clustered in time and space Oppositional After 1975 reproduction viewed as: Any investment by the parent in an individual Parental investment offspring that increases the offspring's chance of survival at cost of parent's investment in other offspring. Polygyny Males mating with multiple females Primary sexual differences Born with these: genitalia, gonads, etc. Prolonged copulation Stay together longer Protandry males emerge before females; ex. zebra longwings; adaptive value: females can start laying eggs earlier ability to get greater representation in Reproductive fitness the next generation Scramble polygyny explosive mating assemblages ex. mayflies Acquired ex. antlers, Secondary sexual differences pheromones, display feathers Sex role reversal male inconspicuous, guards young; female bright, looks for multiple mates Sexual reproduction Passes 50% of genes to next generation Sexual selection Darwin: ___ ____ for traits that increase reproductive success:Subcategory of natural selection Blind sac for sperm storage inside Spermatheca female; 1st sperm in is last sperm out Spermatophore Most insects transfer sperm in a package into female reproductive tract or into environment competition among sperm from different males to Sperm competition fertilize a female's eggs. For insects: this is intense femaleion to be the Only or Last male to mate with a Sperm displacement Pull sperm out of spermatheca before mating (ex. dragonflies) Sperm:egg ratio Insects: 1:1 to 1: hundreds Vertebrates: 1 to 10,000,000 Vertebrate sperm not long lived, much is wasted
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