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Lecture 15

Outline Lecture 15 Parenting 1.odt

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PSYC 3100
Pat Barclay

Outline Lecture 15 Parenting 1 1. Child-rearing in pre-modern societies – Mortality rates -conflicts of interest between parent and offspring because they are not genetically identical. – genes make tough decisions in face of tough circumstances. Could stop investing in an offspring if the genes are faulty. – Somatic effort: genes investment in self, making sure body is sufficiently large enough to survive, immune system, etc. – Reproductive effort: things we need to do to attract mates, as well as parental investment (investment in one offspring that takes awat from parents' ability to invest in other offspring, including investing in future offspring) – “Cooperative breeding”: much help from other relatives – “it takes a village to raise a child”: many people help to care for child (grandparents) – in agricultural society: for children 0-4, taken from obsevations of all 342 members of “GrandeAnse” trinidad. – -mother holds most of the time (almost half) – but another half of the time other people are holding the child other than the parents. – Why does father care less than mother? (holds 10% of time): parental uncertainty: there is always possibility that some other male has impregnated his woman. Selects for decreased investment because of uncertainty. – Trade-offs revisited: parental effort vs. mating effort – Hadza hunter gatherers: men play with their children less when there are more single fertile women around. They could be courting whether openly or not. – what about grandmothers? They invest less in grandoffspring. – Why experience menopause and stop reproducing?: – women have long post-reproductive lifespan: why? – Could be limited number of eggs – shorter lifespan in EEA(environment of evolutionary adaptiveness: lifespan in ancestral environments was lower, much infant fatalities 2. Grandmother Hypothesis: older women can increase RS by switching to investing in grandchildren -children without mothers experience high mortality, & maternal mortality increases with age -grandmothers increase grandchild survival by increasing mother's survival and by direct grandmothering -this can result in: -decreased infant mortality -decreased interbirth intervals -earlier age of first reproduction -evidence for grandmother hypothesis: -grandmothers increased the fecundity (number of offspring) and lifetime reproductive success (LRS) of their daughters (18 century data) -women whose mothers are alive have more kids than those whose mothers are dead.Also more surviving kids. – Why have menopause (i.e. why cease reproducing when older)? – Cease direct reproduction in order to avoid competing over alloparental care with one's daughters & daughters-in-law. - Switch to caring for grandoffspring 3. What is the Optimum Number of Kids? -
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