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120 pages, Paperback
First published December 3, 1976
“Whether sociobiology will succeed in its ambition of incorporating the human sciences depends largely on its theory of kin selection” (p17).Actually, sociobiology has contributed various insightful and empirically productive theoretical concepts (e.g. differential parental investment theory, which appears to underlie many observed sex differences) and most research in human evolutionary psychology focuses on mating behaviour rather than kin-directed altruism.
“No system of human kinship relations is organized in accord with the genetic coefficients of relations as known to sociobiologists” (p57).However, it is consistent with sociobiological theory that individuals related by, for example, marriage should ally together as kin because, although not themselves biologically related, they share a common genetic stake in offspring emanating from the union. This is why political marriages between royal dynasties were so often arranged to cement alliances.
“Kinship is… the organising principle or idiom of most groups and most social relations” (Sahlins 1965: p150).Thus, anthropologist Robin Fox contended:
“Kinship is to anthropology what logic is to philosophy or the nude is to art; it is the basic discipline of the art” (Kinship and Marriage: p10).Yet, as William Irons observes, prior to the rise of sociobiology:
“Anthropological research… left unanswered the basic question of why kinship is important in every human society” (Irons 1979: p79).The ubiquity, if not universality, of kinship as a primary form of social organisation in every known society invites an evolutionary explanation. In short, the tendency to affiliate on the basis of kinship appears to be a universal and innate facet of human nature, one imminently explicable in terms of the theory of kin selection.
“Kindred goes with kindness, ‘two words whose common derivation expresses in the happiest way one of the main principles of social life’. It follows that close kin tend to share, to enter into generalized exchanges, and distant and nonkin to deal in equivalents or in guile. Equivalence becomes compulsory in proportion to kinship distance lest relations break off entirely, for with distance there can be little tolerance of gain and loss even as there is little inclination to extend oneself. To nonkin - ‘other people’, perhaps not even ‘people’ - no quarter must needs be given: the manifest inclination may well be ‘devil take the hindmost’” (Sahlins 1965: p149).This is almost precisely what would be predicted on the basis of sociobiological models of kin selection and reciprocal altruism theory. Moreover, that Sahlins’s observations were made independently and in ignorance of sociobiological theory (that was being independently formulated by biologists on a different side of the university campus) means the convergence cannot be dismissed as mere confirmation bias.
“I was always struck by the degree to which actual genealogical relatedness, as distinct from fictive kinship, seemed to be important to the Yanomamo. They discriminated in many subtle and not-so-subtle ways against non-kin, no matter how they classified them. I concluded, after a detailed analysis of their kinship relatedness, that closeness of kinship, measured genealogically, was an important variable in predicting village fissioning and that group size and cohesion had something to do with the amount of genealogical relatedness withing the group” (Chagnon 1979, p87).By analogy, we might observe that, in modern societies, although stepparents may refer to their stepchildren as ‘their’ children, there is still evidence that the latter suffer disproportionately high rates of abuse (see The Truth about Cinderella).
“Epistemological problems [for sociobiology] presented by a lack of linguistic support for calculating r coefficients of relatedness which amount to a serious defect in the theory of kin selection. Fractions are a very rare occurrence in the world's languages, appearing in Indo-European and in the archaic civilizations of the Near and Far East, but they are generally lacking among so-called primitive peoples. Hunters and gatherers generally do not have counting systems beyond one, two and three.” (p44-45).In other words, Sahlins is arguing that, since fractions are “a very rare occurrence in the world's languages”, primitive peoples cannot possibly be capable of calculating the relevant coefficients of relatedness for particular classes of kin in order to behave adaptively in accordance with sociobiological theory.
“I refrain from comment on the even greater problem of how animals are supposed to figure out that r [ego, first cousins] = 1/8” (p45).Of course, there is now substantial research on the mechanisms underlying kin recognition in both humans and animals, none requiring conscious mathematical calculation.
“[Polynesian] adoption practices… violate the moral [sic] logic of kin selection with regard to parental care, concern for one’s own offspring as against those of genetic competitors, etc” (p48).However, in response, Joan Silk showed Polynesians almost always only adopt close biological relatives (Silk 1980).
“I have written this essay with some sense of urgency, given the current significance of sociobiology, and the good possibility that it will soon disappear as science” (pxv).That he wrote with such haste may perhaps partially explain—but certainly not excuse—Sahlins’s sloppy thinking.