iii. sex and selection a.costs and benefits (notes)
TRANSCRIPT
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III. Sex and SelectionA.Costs and Benefits (notes)
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III. Sex and SelectionA.Costs and Benefits (notes)B.Sexual Selection - selective pressures may differ between the sexes, resulting in selection for different physiologies, morphologies, and behaviors.1.Mating Systems: - should you have many mates or one mate?
# mates
# of
fspr
ing
male
female
NEWTS
Jones (2002)
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III. Sex and SelectionA.Costs and Benefits (notes)B.Sexual Selection - selective pressures may differ between the sexes, resulting in selection for different physiologies, morphologies, and behaviors.1.Mating Systems: - should you have many mates or one mate?
# mates
# of
fspr
ing
male
female
PIPEFISH
Jones (2002)
![Page 4: III. Sex and Selection A.Costs and Benefits (notes)](https://reader035.vdocument.in/reader035/viewer/2022062323/5697c0061a28abf838cc5399/html5/thumbnails/4.jpg)
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III. Sex and SelectionA.Costs and Benefits (notes)B.Sexual Selection - selective pressures may differ between the sexes, resulting in selection for different physiologies, morphologies, and behaviors.1.Mating Systems:2. Intrasexual Selection – where competition within a sex occurs
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Sexual Selection
2. INTRAsexual Competition - competition for harems, territories
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Sexual Selection
2. INTRAsexual Competition - competition for harems, territories - sperm competition
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Sexual Selection
2. INTRAsexual Competition - competition for harems, territories - sperm competition - infanticide
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Sexual Selection
2. INTRAsexual Competition - competition for harems, territories - sperm competition - infanticide - female mimicry in male subadults and "stealth matings"
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"sneaker males"
FEMALE
"Sneaker" male
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Sexual Selection
3. INTERsexual Selection (Mate Preference) - A behavior or morphology that is only performed during the
reproductive season, which increases risk and must then be offset by mating
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Sexual Selection
3. INTERsexual Selection (Mate Preference) - A behavior or morphology that is only performed during the
reproductive season, which increases risk and must then be offset by mating
showy breeding plumagecalling displays
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3. INTERsexual Selection (Mate Preference)- WHY is it ADAPTIVE for the FEMALE to choose a given male??
1. Direct Benefit - parental care
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3. INTERsexual Selection (Mate Preference)- WHY is it ADAPTIVE for the FEMALE to choose a given male??
1. Direct Benefit - nuptual gifts (energy for egg making)
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3. INTERsexual Selection (Mate Preference)- WHY is it ADAPTIVE for the FEMALE to choose a given male??
1. Direct Benefit2. Indirect Benefit: Good Genes - ‘Handicap Theory’
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3. INTERsexual Selection (Mate Preference)- WHY is it ADAPTIVE for the FEMALE to choose a given male??
1. Direct Benefit2. Indirect Benefit: Good Genes - ‘Parasite Load Theory’
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Hmmm....
3. INTERsexual Selection (Mate Preference)- WHY is it ADAPTIVE for the FEMALE to choose a given male??
1. Direct Benefit2. Indirect Benefit: Good Genes - ‘Symmetry Theory’
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Hmmm....
3. INTERsexual Selection (Mate Preference)- WHY is it ADAPTIVE for the FEMALE to choose a given male??
1. Direct Benefit2. Indirect Benefit: Good Genes - ‘Symmetry theory’
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Hmmm....
Hey, It Works!!
3. INTERsexual Selection (Mate Preference)- WHY is it ADAPTIVE for the FEMALE to choose a given male??
1. Direct Benefit2. Indirect Benefit: Good Genes - ‘Symmetry Theory’
![Page 20: III. Sex and Selection A.Costs and Benefits (notes)](https://reader035.vdocument.in/reader035/viewer/2022062323/5697c0061a28abf838cc5399/html5/thumbnails/20.jpg)
3. INTERsexual Selection (Mate Preference)- WHY is it ADAPTIVE for the FEMALE to choose a given male??
1. Direct Benefit2. Indirect Benefit: Good Genes3. Runaway Selection