The end of the adaptive landscape metaphor?
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The concepts of adaptive/fitness landscapes and adaptive peaks are a central part of much of contemporary evolutionary biology; the concepts are introduced in introductory texts, developed in more detail in graduate-level treatments, and are used extensively in papers published in the major journals in the field. The appeal of visualizing the process of evolution in terms of the movement of populations on such landscapes is very strong; as one becomes familiar with the metaphor, one often develops the feeling that it is possible to gain deep insights into evolution by thinking about the movement of populations on landscapes consisting of adaptive valleys and peaks. But, since Wright first introduced the metaphor in 1932, the metaphor has been the subject of persistent confusion, from equivocation over just what the features of the landscape are meant to represent to how we ought to expect the landscapes to look. Recent advances—conceptual, empirical, and computational—have pointed towards the inadequacy and indeed incoherence of the landscapes as usually pictured. I argue that attempts to reform the metaphor are misguided; it is time to give up the pictorial metaphor of the landscape entirely and rely instead on the results of formal modeling, however difficult such results are to understand in ‘intuitive’ terms.
KeywordsAdaptive landscape Fitness landscape Wright Gavrilets Holey landscape Peak shift Shifting balance theory Bateson-Dobzhansky-Muller model Speciation Adaptation Metaphor
- Cartwright N (1999) The dappled world: a study of the boundaries of science. Cambridge University Press, CambridgeGoogle Scholar
- Chang H (2004) Inventing temperature: measurement and scientific progress. Oxford University Press, New YorkGoogle Scholar
- Gavrilets S (2004) Fitness landscapes and the origin of species. Princeton University Press, PrincetonGoogle Scholar
- Provine WB (1986) Sewall Wright and evolutionary biology. University of Chicago Press, ChicagoGoogle Scholar
- Ruse M (1996) Are pictures really necessary? The case of Sewall Wright’s ‘adaptive landscapes’. In: Baigrie BS (ed) Picturing knowledge: historical and philosophical programs concerning the use of art in science. University of Toronto Press, Toronto, Canada, pp 303–337Google Scholar
- Wright S (1931) Evolution in mendelian populations. Genetics 16:97–159Google Scholar
- Wright S (1932) The roles of mutation, inbreeding, crossbreeding, and selection in evolution. In: The sixth international congress of genetics, vol I, pp 356–366Google Scholar