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Nature 421, 225-226 (16 January 2003) | doi:10.1038/421225b
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Evolutionary biology: Splitting in space
Diethard Tautz
Abstract
Disjunct distributions of closely related species are not necessarily the outcome of passive fragmentation of populations. Instead, they can be the consequence of speciation within a population.
Until recently, the overriding credo for explaining how new species are formed has run as follows: first, a population of organisms splits into several subpopulations; once isolated from other members of their own kind, these subpopulations become adapted to local conditions; so, over millions of years, their descendants evolve into new species. This is 'allopatric speciation', a concept in which spatial separation comes first and genetic divergence follows, and which has dominated biological thinking for many decades.
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