Rapid spread of invasive genes into a threatened native species
- 23 February 2010
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 107 (8), 3606-3610
- https://doi.org/10.1073/pnas.0911802107
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.This publication has 52 references indexed in Scilit:
- Invasive hybrid tiger salamander genotypes impact native amphibiansProceedings of the National Academy of Sciences of the United States of America, 2009
- Rapid fixation of non-native alleles revealed by genome-wide SNP analysis of hybrid tiger salamandersBMC Evolutionary Biology, 2009
- Hybridization versus conservation: are domestic cats threatening the genetic integrity of wildcats (Felis silvestris silvestris) in Iberian Peninsula?Philosophical Transactions B, 2008
- A genome-wide signature of positive selection in ancient and recent invasive expansions of the honey bee Apis melliferaProceedings of the National Academy of Sciences of the United States of America, 2008
- Hybrid vigor between native and introduced salamanders raises new challenges for conservationProceedings of the National Academy of Sciences of the United States of America, 2007
- Eukaryotic genome size databasesNucleic Acids Research, 2006
- Letting the gene out of the bottle: the population genetics of genetically modified cropsNew Phytologist, 2006
- Native and Introduced Ecosystem Engineers Produce Contrasting Effects on Estuarine Infaunal CommunitiesBiological Invasions, 2006
- The problems with hybrids: setting conservation guidelinesTrends in Ecology & Evolution, 2001
- EXTINCTION BY HYBRIDIZATION AND INTROGRESSIONAnnual Review of Ecology and Systematics, 1996