(NAS Colloquium) The Future of Evolution (2002) / Chapter Skim
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The Evolutionary Impact of Invasive Species
The Evolutionary Impact of Invasive Species
Pages 58-63
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From page 58... ...
. In addition to the greater number of species crossing borders there is also a buildup in the invasive potential of those nonnative species already established in a region, as immigration increases their population sizes.
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From page 59... ...
There are also examples of rapid evolution in native species in response to an introduced species. Carrot and Dingle (25)
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From page 60... ...
They specifically note that introductions may threaten rare species on islands and give a number of examples from around the world, including threats to the rare Arbutus canariensis and Senecio teneriffae on the Canary Islands, Gossypium tomentosum on the Hawaiian Islands, and Pinguicula vulgaris and Linaria vulgaris in the British Islands. They posit that the threat of extinction of rare species by hybridization is very high and that habitat disruption and invasive species are increasing this threat to the degree that conservation programs should strive to isolate rare species from cross-compatible congeners.
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From page 61... ...
Some invasive species completely eliminate native species through competitive exclusion. The invasive fire ant (Solenopsis invicta)
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From page 62... ...
Concluding Remarks In the course of this review we have discussed the mechanisms by which invasive species evolve in response to their new biotic and abiotic environments, and how invasive species have altered the evolutionary trajectory of native species with which they interact. While it is not surprising that an invasive species would evolve in their new habitat in response to a new set of selective pressures, it is surprising that there are a number of clear examples of evolutionary shifts in native species in response to the presence of invaders, given the small number of generations involved in interactions, and the short period for which such interactions have been studied by ecologists and evolutionary biologists.
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