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Exaptation—a Missing Term in the Science of Form

  • Stephen Jay Gould (a1) and Elisabeth S. Vrba (a2)
Abstract

Adaptation has been defined and recognized by two different criteria: historical genesis (features built by natural selection for their present role) and current utility (features now enhancing fitness no matter how they arose). Biologists have often failed to recognize the potential confusion between these different definitions because we have tended to view natural selection as so dominant among evolutionary mechanisms that historical process and current product become one. Yet if many features of organisms are non-adapted, but available for useful cooptation in descendants, then an important concept has no name in our lexicon (and unnamed ideas generally remain unconsidered): features that now enhance fitness but were not built by natural selection for their current role. We propose that such features be called exaptations and that adaptation be restricted, as Darwin suggested, to features built by selection for their current role. We present several examples of exaptation, indicating where a failure to conceptualize such an idea limited the range of hypotheses previously available. We explore several consequences of exaptation and propose a terminological solution to the problem of preadaptation.

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Abercrombie M., Hickman C. H., and Johnson M. L. 1951. A Dictionary of Biology. 5 th edition, 1966. Hunt Bernard and Co. Ltd., Aylesbury, Great Britain.
Arnold A. J. and Fristrup K. 1982. The hierarchical basis for a unified theory of evolution. Paleobiology, in press.
Bakker R. T. 1975. Dinosaur renaissance. Sci. Am. 232(4):5578.
Bock W. 1967. The use of adaptive characters in avian classification. Proc. XIV Int. Ornith. Cong., Pp. 6674.
Bock W. 1979. A synthetic explanation of macroevolutionary change—a reductionistic approach. Bull. Carnegie Mus. Nat. Hist. No. 13:2069.
Bock W. J. 1980. The definition and recognition of biological adaptation. Am. Zool. 20:217227.
Bock. W. J. and von Wahlert G. 1965. Adaptation and the form-function complex. Evolution. 10:269299.
Britten R. J. and Davidson E. H. 1971. Repetitive and non-repetitive DNA sequences and a speculation on the origins of evolutionary novelty. Q. Rev. Biol. 46:111131.
Cohen S. N. 1976. Transposable genetic elements and plasmid evolution. Nature. 263:731738.
Darwin C. 1859. On the Origin of Species. J. Murray: London.
Dickerson R. E. and Geis I. 1969. The Structure and Action of Proteins. Harper and Row; New York.
Doolittle W. F. and Sapienza C. 1980. Selfish genes, the phenotype paradigm, and genome evolution. Nature. 254:601603.
Duthie R. B. and Ferguson A. B. 1973. Mercer's Orthopaedic Surgery. 7thedition. Edward Arnold; London.
Fisher R. A. 1958. Genetical Theory of Natural Selection. (2nd revised edition). Dover; New York.
Foucault M. 1965. Madness and Civilization. Random House; New York.
Foucault M. 1970. The Order of Things. Random House; New York.
Frazzetta T. H. 1975. Complex Adaptations in Evolving Populations. 267 pp. Sinauer Associates; Sunderland, Massachusetts.
Gould S. J. 1981. What happens to bodies if genes act for themselves? Nat. Hist. November.
Gould S. J. and Lewontin R. C. 1979. The spandrels of San Marco and the Panglossian Paradigm: a critique of the adaptationist programme. Pp. 147164. In: Maynard Smith J. and Holliday R., eds. The Evolution of Adaptation by Natural Selection. R. Soc. London.
Halstead L. B. 1969. The Pattern of Vertebrate Evolution. Oliver and Boyd; Edinburgh.
Harrison Matthews L. 1939. Reproduction in the spotted hyena Crocuta crocuta (Erxleben). Phil. Trans. R. Soc. (B) 230:178.
Kleckner N. 1977. Translocatable elements in procaryotes. Cell. 11:1123.
Kruuk H. 1972. The Spotted Hyena, a Study of Predation and Social Behavior. Univ. Chicago Press; Chicago, Illinois.
Kurtén B. 1980. Dance of the Tiger. Pantheon; New York.
Lewin B. 1975. Units of transcription and translation. Cell. 4:7793.
McLachlan G. R. and Liversidge R. 1978. Roberts' Birds of South Africa. 4th edition (first publ. in 1940). John Voelcker Bird Book Fund; Cape Town.
Mivart St. G. 1871. On the Genesis of Species. MacMillan; London.
Ohno S. 1970. Evolution by Gene Duplication. 160 pp. Springer; New York.
Orgel L. E. and Crick F. H. C. 1980. Selfish DNA: the ultimate parasite. Nature. 284:604607.
Oster G. 1980. Mechanics, morphogenesis and evolution. Address to Conference on Macroevolution, October 1980, Chicago.
Ostrom J. H. 1974. Archaeopteryx and the origin of flight. Q. Rev. Biol. 49:2747.
Ostrom J. H. 1979. Bird flight: how did it begin? Am. Sci. 67:4656.
Paterson H. E. H. 1982. Species as a consequence of sex, in press. Am. Sci.
Pautard F. G. E. 1961. Calcium, phosphorus, and the origin of backbones. New Sci. 12:364366.
Pautard F. G. E. 1962. The molecular-biologic background to the evolution of bone. Clin. Orthopaed. 24:230244.
Porter R. MS. Problems in the treatment of ‘madness’ in English science, medicine and literature in the eighteenth century.
Racey P. A. and Skinner J. C. 1979. Endocrine aspects of sexual mimicry in spotted hyenas Crocuta crocuta. J. Zool. London. 187:315326.
Raup D. M. and Gould S. J. 1974. Stochastic simulation and evolution of morphology—towards a nomothetic paleontology. Syst. Zool. 23:305322.
Romer A. S. 1963. The ‘ancient history’ of bone. Ann. N.Y. Acad. Sci. 109:168176.
Scott J. D. and Symons N. B. B. 1977. Introduction to Dental Anatomy. Churchill Livingstone; London.
Seilacher A. 1970. Arbeitskonzept zur Konstruktionsmorphologie. Lethaia. 3:393396.
Seilacher A. 1972. Divariate patterns in pelecypod shells. Lethaia. 5:325343.
Vrba E. S. 1980. Evolution, species and fossils: how does life evolve? S. Afr. J. Sci. 76:6184.
Williams G. C. 1966. Adaptation and Natural Selection. Princeton University Press; Princeton, New Jersey.
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Paleobiology
  • ISSN: 0094-8373
  • EISSN: 1938-5331
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