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Science 11 December 1998:
Vol. 282. no. 5396, p. 1953
DOI: 10.1126/science.282.5396.1953m
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This Week in Science

J. A. Klinka and R. M. Zink (Reports, 12 Sept. 1997, p. 1666) found that "molecular data suggest a relatively protracted history of speciation events among North American songbirds over the past 5 million years," contrary to that suggested by the "Late Pleistocene Origins (LPO) model."

B. S. Arbogast and J. B. Slowinski comment that the report contains invalid assumptions about estimating "dates of divergence," no measures of error, and no test of whether "a molecular clock holds for their data"--which Arbogast and Slowinski find it does not.

In response, Klicka and Zink discuss the assumptions made in the report (finding that a molecular clock "is valid for this data set"), provide details of their analyses, and maintain that the LPO model of speciation has been falsified.The full text of these comments can be seen at www.sciencemag.org/cgi/content/full/282/5396/1955a




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Science. ISSN 0036-8075 (print), 1095-9203 (online)