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Science 14 January 2000:
Vol. 287. no. 5451, pp. 308 - 309
DOI: 10.1126/science.287.5451.308
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Reports

Rapid Evolution of a Geographic Cline in Size in an Introduced Fly

Raymond B. Huey, 1*dagger George W. Gilchrist, 1*ddagger Margen L. Carlson, 1 David Berrigan, 1 § Luís Serra 2

The introduction and rapid spread of Drosophila subobscura in the New World two decades ago provide an opportunity to determine the predictability and rate of evolution of a geographic cline. In ancestral Old World populations, wing length increases clinally with latitude. In North American populations, no wing length cline was detected one decade after the introduction. After two decades, however, a cline has evolved and largely converged on the ancestral cline. The rate of morphological evolution on a continental scale is very fast, relative even to rates measured within local populations. Nevertheless, different wing sections dominate the New versus Old World clines. Thus, the evolution of geographic variation in wing length has been predictable, but the means by which the cline is achieved is contingent.

1 Department of Zoology, University of Washington, Box 351800, Seattle, WA 98195-1800, USA.
2 Departament de Genètica, Universitat de Barcelona, 08071 Barcelona, Spain.
*   These authors contributed equally to this work.

dagger    To whom correspondence should be addressed. E-mail: hueyrb{at}u.washington.edu

ddagger    Present address: Department of Biology, Clarkson University, Box 5805, Potsdam, NY 13699-5805, USA.

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