| 单词 | vicariance |
| 释义 | > as lemmasviˈcariance viˈcariance n. the existence of vicariant forms; the separation or subdivision of a population by the appearance of a geographical barrier and subsequent differentiation. ΘΚΠ the world > life > biology > biological processes > evolution > [noun] > parallelism or vicariance parallelism1868 vicariism1939 vicariad1944 vicariant1952 vicariance1957 1957 A. Macfadyen Animal Ecol. xv. 223 It is also possible to use other criteria..such as frequency, dominance or even ‘vicariance’. 1972 D. Bramwell in D. H. Valentine Taxonomy, Phytogeogr. & Evolution ix. 151 Adaptive radiation..is a positive process where genetical response to the stimulus of the environment is the main factor; but vicariance, that is divergent evolution in which geographical isolation has been a very important factor, is perhaps a more passive process where the inter~action of genetic drift and weak selection result in the establishment of distinctive characters in populations which occupy essentially similar ecological habitats to their parents. 1979 Nature 15 Feb. 562/1 It is possible that the presence of hadrosaurs in Laurasia and Gondwanaland represents vicariance rather than dispersal; if so, hadrosaurs would be expected to occur on most continents. 1981 Nelson & Platnick Systematics & Biogeogr. i. 45 Speciation, at least in animals, usually involves a process of geographic isolation.., and occurs when a formerly continuous population is divided by the appearance of a barrier (a process called vicariance). < as lemmas |
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