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The selfish gene

1977, Biological Conservation

BOOK REVIEWS The Selfish Gene. By Richard Dawkins. Oxford University Press, Oxford. 1976. xi + 224 pp., 15 x 22cm. Price: £2.95. In recent years we have seen the healthy demystification by biologists of ideas which have long been almost unquestioned parts of man's beliefs. For example, Desmond Morris's Naked Ape, if it did nothing else, demolished anthropocentrism; Steven Rose's Conscious Brain and Colin Blakemore's 1976 BBC Reith Lectures have uprooted the false antithesis between mind and brain. Richard Dawkins' book is about how living organisms evolve. He brilliantly popularises work on the evolution of social behaviour which has blossomed in the literature in the past 5 years, and he shows how this work clarifies our understanding of the fundamental processes involved in the evolutionary adaptation of living organisms. In The Selfish Gene, new insights produced by G. C. Williams, W. D. Hamilton, E. O. Wilson, J. MaynardSmith, R. L. Trivers, often in mathematical and quantitative papers, are made accessible to the non-specialist. Conservationists and others can now gain a very clear picture of what evolution is 'all about'. The central message is very simple: that genes which build themselves more successful bodies survive, and that there is absolutely nothing more to evolution than that. At first sight this seems childishly obvious, but Dawkins soon persuades one that the emphasis must be on the 'absolutely'. As his central theme is social behaviour, Dawkins' book shares common ground with K. Lorenz's On Agression, I. Eibl-Eibesfeldt's Love and Hate, and R. Ardrey's The Social Contract and The Territorial Imperative, but, and here most biologists would agree with him, he shows that these authors 'got it totally and utterly wrong'. Their central misconception is that social behaviour is based on animals behaving altruistically, the individual selflessly laying down his life (or, strictly, minimising his chances of survival) for the good of the group (strictly, increasing the chances of survival of his fellows in the population). Often implicit in this argument is the assumption that such behaviour evolved by 'group selection', groups having the gene for the altruistic trait outsurviving other groups which were not so fortunate. Few biologists have really 317 Biol. Conserv. (12) 0977)--© Applied Science Publishers Ltd, England, 1977 Printed in Great Britain 318 BOOKREVIEWS believed this for a long time, since it is almost impossible to show how such a selfless gene could spread among one group in the first place. (Dawkins explains one exception: the intriguingly named 'Green Beard Effect'.) However, in addition to showing that only selfish genes can survive, Dawkins explicitly sets out to counter the surprisingly pervasive vague belief among many biologists (and their educators !) that adaptation is 'for the good of the species'. For a biologist, this is just fuzzy thinking, but The Selfish Gene is a book which anyone concerned with conservation of living systems should read, because many have understandably followed Nobel Prize winners like Lorenz or popularisers like Ardrey. Not only have these authors given the impression that altruistic behaviour is widespread among animals, for example reducing dangerous aggressive encounters to formalised tournaments, but also they have often implied that man has somehow fallen from grace in this respect. From what I have written so far, the reader may be expecting Dawkins to outdo even Desmond Morris, by considering man as nothing but a naked selfish ape, but in fact the book is relatively free from the wilder extrapolations from animal to man, Dawkins speculating that man is perhaps the only species capable of genuinely altruistic acts. Whether you believe his argument on this point or not, The Selfish Gene should finally put the nails in the lid of the coffin of 'group selection'. The first four chapters contain an admirably clear and brief account of some fundamental biology including the genetic code, origin of life, heredity, and how genes supervise metabolism and development. Dawkins explains the importance of nervous systems as rapid "executive computers': consciousness evolves when the computer's simulation model for predicting the consequences of its decisions becomes complex enough to include a model of the animal itself. The next six chapters are concerned with behaviour. Maynard-Smith's elegant application of games theory, the Evolutionarily Stable Strategy, is stripped of its algebra with no loss of rigour and we see exactly when and how ritualised contests (or otherwise) may evolve. Wynne-Edwards' theory of the altruistic reduction of offspring is very fairly summarised and shown not to be supported by the evidence. The most important part of the book clearly explaihs the basis of kin selection, which now provides a most satisfactory explanation for the evolution of much social behaviour in animals from ants to man. From the genes point of view it is worth laying down one's life for nine cousins (or taking a small risk of one-ninth chance of death for one cousin). Dawkins gives one insight which has been staring biologists in the face for so long that few of them, including E. O. Wilson (and myself!) had seen it probably because Hamilton buried the idea in a very mathematical paper. The insight is that kin selection, far from being a rather special circumstance, is actually responsible for all of the adaptations concerned with enhanced child survival, including body organs such as wombs, pouches, placentas, milk glands. For genes to evolve which 'invest' the resources of parents in these devices, there has to be a bigger pay-off in terms of greater numbers of genes perpetuated as copies. In fact the cost/benefit analysis performed blindly by natural selection always includes such BOOKREVIEWS 319 "investment' factors as life-expectancy and viability of the recipients of altruism. The evolution of the menopause in humans is plausibly explained in this way. This section of the book ends with a fascinating glimpse of the relevance of reciprocal altruism to human behaviour. Money is 'a formal token of delayed reciprocal altruism'. The last chapter of the book, where Dawkins abandons his precise biological insight to advance a new theory of the evolution of human culture based on some hypothetical particulate ideas called 'memes', I found pretty unconvincing. In the unlikely event of Dawkins being right here, let us hope that the 'meme' for conservation (pretty altruistic at first sight) manages to spread plenty of copies. I found the absence of a discussion on the biochemists' ~neutralist' theory of evolution surprising, but otherwise my only criticisms were that (a) Dawkins fails to show any major practical advantage for his treating the gene itself as the unit of survival rather than the more conventional (and definitelyuseful) individual; and, (b) that Dawkins' seductively simple definition of a gene is not really backed up by any evidence (apposite in light of recent work on genetic code of tk x 174 virus). Dawkins suggests that the book should be read 'almost as Science Fiction', and indeed the 'survival machines' (bodies), 'gene farms' (populations), and 'executive computers' (the brain), do serve to heighten the impact of the ideas. However, in places excitement gets the better of enlightenment and one wishes an editor had toned down the more purple of Dawkins' passages such as the bit which has swarms of genes lumbering around inside giant robots. The passages which require the reader to take a deep breath are well signalled though, and for the rest Dawkins writes a good plain style. He is at his best when explaining subtle and quantitative ideas like the ESS or parental investment in child rearing. The Selfish Gene is a book which anyone with an interest in living organisms will enjoy and profit from; all students of biology in schools and universities should definitely read it; professional biologists will, I am sure, find it a worthwhile investment of their time (I disobeyed a domestic rule about 'work' books and read it in bed at night). It is very reasonably priced and free from typographical errors. ToNy PITCHER Nature Conservation and Agriculture: Appraisal and Proposals by the Nature Conservancy Council. The Nature Conservancy Council, London. 1977. 40 pp. 21 x 30 cm. Price: £1.00. Agricultural reclamation of marginal land, and the further improvement of land already under moderately intensive agricultural use, are now a major threat to seminatural habitats and the wildlife they support in the British Isles. Such is the clear warning of the first of a series of reports to be published by the Nature Conservancy Council on the ecological implications of environmental changes taking place today.