| 释义 |
speciation Biol.|spiːʃɪˈeɪʃən|
[f. species + -ation.]
The formation of new and distinct species in the course of evolution.
1906O. F. Cook in Science 30 Mar. 506/2 Speciation..is the origination or multiplication of species by subdivision, usually..as a result of environmental incidents. 1926Nature 21 Aug. 271/1 Thus speciation through continuity stands in contrast with mutation through discontinuity. Ibid. 272/1 Isolation is the most important factor in the speciation of birds. 1953J. S. Huxley Evolution in Action iii. 71 Much of speciation represents a frill of mere diversity. 1978Nature 21 Sept. 255/1 Speciation involves the splitting of a single evolutionary lineage into two or more genetically independent ones.
Add: Hence speciˈational a., pertaining to or resulting from speciation (esp. in phr. speciational evolution).
1944G. G. Simpson Tempo & Mode in Evolution vii. 203 The pertinent data of paleontology fall into patterns of the phyletic mode. It has naturally resulted that paleontologists have overemphasized this mode..just as most experimentalists have overemphasized and overgeneralized from the speciational mode. 1983W. C. Kimler in M. Grene Dimensions of Darwinism v. 125 The creaking of the synthesis at present around its adaptationist and speciational ideas is perhaps to be expected as the result of a fresh ecological input. 1988E. Mayr Toward New Philos. of Biol. xxvi. 483 It has been shown that ‘speciational evolution’ (perhaps a better term than punctuationism) is fully consistent with Darwinism. 1989Cladistics V. 58 Speciational evolution, via punctuational change, is at least a viable explanation for the distribution of allozyme character change found among species of lizards in the genus Sceloporus. |