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Rapid Spread of Invasive Genes into a Threatened Native Species

Benjamin M. Fitzpatrick, Jarrett R. Johnson, D. Kevin Kump, Jeramiah J. Smith, S. Randal Voss, H. Bradley Shaffer and Douglas Futuyma
Proceedings of the National Academy of Sciences of the United States of America
Vol. 107, No. 8 (Feb. 23, 2010), pp. 3606-3610
Stable URL: http://www.jstor.org/stable/40537333
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Rapid Spread of Invasive Genes into a Threatened Native Species
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Abstract

When introduced or cultivated plants or animals hybridize with their native relatives, the spread of invasive genes into native populations might have biological, aesthetic, and legal implications. Models suggest that the rate of displacement of native by invasive alleles can be rapid and inevitable if they are favored by natural selection. We document the spread of a few introduced genes 90 km into a threatened native species (the California Tiger Salamander) in 60 years. Meanwhile, a majority of genetic markers (65 of 68) show little evidence of spread beyond the region where introductions occurred. Using computer simulations, we found that such a pattern is unlikely to emerge by chance among selectively neutral markers. Therefore, our results imply that natural selection has favored both the movement and fixation of these exceptional invasive alleles. The legal status of introgressed populations (native populations that are slightly genetically modified) is unresolved by the US Endangered Species Act. Our results illustrate that genetic and ecological factors need to be carefully weighed when considering different criteria for protection, because different rules could result in dramatically different geographic areas and numbers of individuals being protected.

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