Pair-Bonding vs Tournament Species
How picky are males about whom they mate with? In species B, males mate with anyone, anywhere, anytime—it only costs the price of some sperm. In contrast, males of species A, with its rule of “You get her pregnant, you do child care,”
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in species A, females compete aggressively to pair-bond with a particularly desirable (i.e., paternal) male.
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What about human sexual dimorphism? Men are roughly 10 percent taller and 20 percent heavier than women, need 20 percent more calories, and have life spans 6 percent shorter—humans are more dimorphic than monogamous species, less than polygamous ones.
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==We aren’t classically monogamous or polygamous==. As everyone from poets to divorce attorneys can attest, we are by nature profoundly confused—mildly polygynous, floating somewhere in between.
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| Pair-Bonded | Tournament | |
|---|---|---|
| Male mating pickiness | High | Low |
| Male parental behavior | Extensive | Minimal |
| Variability in male reproductive success | Low | High |
| Testes size, Sperm count | Small/low | Large/High |
| Levels of male-male aggression | Low | High |
| Degree of dimorphism in body weight, physiology, coloration, and life span | Low | High |
| Females select for | Parenting Skill | Good Genes |
| Rates of cuckoldry | High | Low |
see also
Tags: neurobiology science
Superlink: 051 ☣Neurobiology 050 🧠Neuroscience
Quellen
Chapter 10 The Evolution of Behavior
Erstellt: 30-05-22 21:15