Climb Every Mountain?

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Science  19 Dec 2003:
Vol. 302, Issue 5653, pp. 2074-2075
DOI: 10.1126/science.1093165

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Evolutionary biologists have long argued that adaptation to a particular environmental niche should constrain a population's ability to survive in other niches. In their Perspective, Elena and Sanjuán discuss new evolution experiments with populations of the bacterium Pseudomonas fluorescens ( Buckling et al.). These experiments provide evidence that as a bacterial population becomes a niche specialist, it is less able to adapt to other niches.