Evolutionary Biology: Starting Species With Third Parties and Sex Wars

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Science  13 Sep 1996:
Vol. 273, Issue 5281, pp. 1499-1502
DOI: 10.1126/science.273.5281.1499


How does evolution make new species without a geographic barrier to isolate populations and prevent them from exchanging genes? It has a whole bag of tricks for doing so, as a recent conference showed. There researchers described how such factors as bacterial agents, mimicry, changes in a single pigment gene or in the song of a bird, or the rapid evolution of a sperm surface protein can all trigger cascades of events leading to a new species, without any geographic barrier.