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Science 26 January 2007:
Vol. 315. no. 5811, p. 461
DOI: 10.1126/science.1136073
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Technical Comments

Comment on "Evolutionary Paths Underlying Flower Color Variation in Antirrhinum"

Mark D. Rausher

Although Whibley et al. (Reports, 18 August 2006, p. 963) argue for the presence of high-fitness ridges in the Antirrhinum floral-color adaptive landscape, their data are equally compatible with adaptive landscapes having a single peak and no ridges. Their demonstration of divergent selection across a hybrid zone argues against the presence of adaptive ridges.

Department of Biology, Duke University, Box 90338, Durham, NC 27708, USA.

E-mail: mrausher{at}duke.edu

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