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单词 ring species
释义

> as lemmas

ring species
ring species n. Biology a group of closely related organisms, populations of which are distributed geographically in a ring-shaped cline, diverging in opposite directions and culminating in one point on the ring where two populations coexist but cannot interbreed.
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1954 A. J. Cain Animal Species & their Evol. viii. 141 The clearest evidence of geographical speciation is afforded by ring-species, in which two forms that overlap and behave as good species are nevertheless connected by a ring of subspecies.
1992 G. C. Williams Nat. Select. viii. 124 Adjacent populations are often closely similar, more geographically remote populations more divergent. This pattern and its implications for speciation are clearest in ring species, intrinsically isolated compatriots connected by a chain of allopatric intermediates.
2004 Proc. Royal Soc. B. 271 899/2 The circumpolar ring of interbreeding taxa might yet close to form a classic ring species, not by an invasion of herring gulls from North America to Europe..but by expansion of lesser black-backed gulls in the opposite direction.
extracted from ringn.1
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