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Published byJoshua Norris Modified over 5 years ago
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Bonus 1 due W 2/28 I hope she likes my feathers because I am tired of dragging them around everywhere.
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better off helping with these kids or should I mate with someone else?
Am I the only one? Am I better off helping with these kids or should I mate with someone else? Is this the best I can do? Maybe I can find someone with better genes or more genetic diversity.
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1 Which is male? 2
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1 Which is male? 2
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Female grizzly bears cannot reproduce while lactating
Female grizzly bears cannot reproduce while lactating. Therefore they can only reproduce every once every 3 years…
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…this leads to competition between males
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Sexual Dimporphism: differences between males and females
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Average height/weight by sex in U.S.
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Ratio of Weight Male/Female
M/F
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Bonobos
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Primates have different reproductive stratagies
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Ratio of Weight Male/Female
M/F
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Testes Compared to Overall Weight
Testicle size (oz) per body weight (lbs)
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Pipefish: related to seahorses
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Pregnant Male: Males care for developing eggs
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Males care for developing eggs
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The Measurement of Sexual Selection Using Bateman’s Principles:
An Experimental Test in the Sex-Role-Reversed Pipefish Syngnathus typhle (2005) Integrative and Comparative Biology, 45:874–884 Adam G. Jones, Gunilla Rosenqvist, Anders Berglund, and John C. Avise
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frequency number of mates Jones et al. Fig. 1
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frequency number of mates Jones et al. Fig. 1
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frequency number of mates Jones et al. Fig. 1
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The sex ratio affects who will successfully reproduce
The sex ratio affects who will successfully reproduce. Pipefish females are more affected. Jones et al. Fig. 1
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number of individuals body length (mm) Jones et al. Fig. 4
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number of individuals body length (mm) Jones et al. Fig. 4
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medium sized female pipefish are most successful at reproducing while size is less critical for male pipefish Jones et al. Fig. 4
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Different reproductive strategies lead to differences in sexual dimorphism.
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