Dispersal and selection mediate hybridization between a native and invasive species
Kovach R, Muhlfeld C, Boyer M, Lowe W, Allendorf F, Luikart G. 2015. Dispersal and selection mediate hybridization between a native and invasive species. Proceedings of the Royal Society B: Biological Sciences. 282(1799)
The spread of genetic introgression between a native (Oncorhynchus clarkii) and invasive (Oncorhynchus mykiss) trout is documented, and identified are the mechanisms influencing genetic admixture. In two populations inhabiting contrasting environments, non-native admixture increased rapidly from 1984 to 2007 and was driven by surprisingly consistent processes. Individual admixture was related to two phenotypic traits associated with fitness: size at spawning and age of juvenile emigration. Fish with higher non-native admixture were larger and tended to emigrate at a younger age—relationships that are expected to confer fitness advantages to hybrid individuals. Strong selection against non-native admixture was evident across streams and cohorts (mean selection coefficient against genotypes with non-native alleles (s). Hybridization was promoted in both streams by the continuous immigration of individuals with high levels of non-native admixture from other hybrid source populations. Thus, antagonistic relationships between dispersal and selection are mediating invasive hybrid-ization between these fish.
- Type
- Journal Article
- Authors
- Kovach, Ryan; Muhlfeld, Clint; Boyer, M; Lowe, W; Allendorf, F; Luikart, G
- Units
- CRCO , GLAC
- Keywords
- Aquatic Studies, Fisheries, Hybridization, introgression, Invasive Species, North Fork Flathead River, transboundary flathead
- Subjects
- Ecological Framework: Biological Integrity | Invasive Species | Invasive/Exotic animals , Ecological Framework: Biological Integrity | Focal Species or Communities | Fishes