mating patterns, family types, social structures, and selection pressures

i’ve mentioned this before (see here and here and here), specifically wrt family types like nuclear families vs. clans, but i thought i’d bring it up again:

more attention ought to be paid to things like mating patterns, family types, and the social structures within societies as creating different sorts of selection pressures for different types of individuals — personality types, iq, other behavioral patterns, etc.

some researchers have been looking at how, for instance, mating patterns can affect genes and genomes in populations: cochran and harpending have been investigating paternal age and mutation rates, some of greg’s low-hanging fruit (double entendre NOT intended), and hage and marck discovered how matrilineality and matrilocal residence affected the distribution of y-chromosome haplogroups in polynesia (other researchers have done similar research for other parts of the world) — and these types of research are really interesting and very exciting, but they’re not quite what i’m talking about.

here’s one example of the sort of thing i’m interested in asking (and answering!): what sort of persons succeed in reproducing the most in a society based on the nuclear family versus a society based around extended families or even clans? what sort(s) of personalities do they have? how high of an iq do they need? what other types of behavioral patterns do they exhibit?

gregory clark famously found that, over the course of the medieval period in england, it was the hard-working, thrifty, forward planning folks with middle-class values who reproduced the most. but he made next to no (actually i think it was none whatsoever) mention of the prevailing family type in medieval england: the nuclear family, which was well-established by at least the 1200s.

imagine what sort of people would do well — what sorts of traits would be selected for — in a society which was based on the individual and his nuclear family making it on their own — with a little help from immediate family and, most importantly, friends and neighbors. someone trustworthy? and trusting? someone who can plan ahead, because those who don’t can’t rely on falling back on an extended family/clan? someone with not the lowest iq in the world?

and what sorts of people do well in a clannish society? those who believe in putting family first ahead of friends and/or the wider community? those who trust their family members more than outsiders, because the outsiders have always had their own family members that they prioritized? individuals who don’t feel a strong urge to plan that far in advance, ’cause hey — uncle joe or cousin ahmed will be there to help out when times are tough? too many individuals who are not so bright because their brighter relatives support them and their offspring?

here, once again, is my favorite example of how at least some clannish societies work. (see if you can spot the potential dysgenic practices!) this is from modern-day egypt — upstream which is much more clannish/tribal than the delta region of the country — Development and Social Change in Rural Egypt (1986), pgs. 150-51:

“The importance that poor peasants attach to the brokerage services by a single wealthy patron can be seen in the continuing importance of the extended family unit in rural Egypt. In the village of El-Diblah [pseudonymous village representative of upper egypt], as well as other Egyptian communities, politics and much of life itself are organized on the basis of large, extended families numbering 500 members or more. These extended families are broad patrilineal structures, which may or may not be able to trace themselves back to a single historical founder. While these extended families do not represent monolithic social structures, most fellahin are animated by a real feeling of belonging to a particular extended family unit. When they need a loan or help with outside government officials, poor peasants will often turn to the leader or a prominent person within their extended family. In the village of El-Diblah three of the four leading extended families are headed by rich peasants. In the eyes of most fellahin, this is exactly as it should be. In the countryside wealth acquired by virtually any means provides a good indication of an individual’s ability to deal with (or against) the ouside world.

“‘Zaghlul,’ for example, is the rich peasant head of one of the leading extended families in El-Diblah. A short, wiry 55-year-old fellah, whose dress and mannerisms are almost indistinguishable from those of other peasants in the village, Zaghlul now owns about 25 feddans of land. Much of this land is planted in sugar cane, a crop that he uses to supply his own cane press that produces black molasses for local sale. As the owner of 25 feddans of land, and the proprietor of one of the few ‘manufacturing’ enterprises in the village, Zaghlul is able to dispense a wide number of agricultural and non-agricultrual work opportunities to favored members of his extended family. Many of the poorer members of his extended family live in a mud-brick settlement surrounding Zaghlul’s modern two-story, red-brick house. In the evenings a steady stream of these poor people come to Zaghlul’s house, seeking brokerage and intercessionary services (for example, help in securing agricultural inputs and medical services from the government)….”

mating patterns matter. family types matter. social structures matter. all in the sense that they (i think) set up selection pressures for different sorts of traits — or at least they can do. no doubt they cannot be looked at in isolation (one needs to consider all sorts of other life factors, too, like economic structures), but i think they’re probably pretty important — and need more attention. from this perspective, i mean.

previously: a sense of entitlement and clannish dysgenics and inbreeding and iq

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