Landscape influences on genetic differentiation among bull trout populations in a stream-lake network
Meeuwig MH, Guy CS, Kalinowski ST, Fredenberg WA. 2010. Landscape influences on genetic differentiation among bull trout populations in a stream-lake network. Molecular Ecology. 19:3620–3633
This study examined the influence of landscape heterogeneity on genetic differentiationbetween migratory bull trout (Salvelinus confluentus) populations in Glacier NationalPark, Montana. An information-theoretic approach was used to compare differentconceptual models of dispersal associated with barriers, different models of isolation bydistance, and the combined effects of barriers, waterway distance, patch size, and intraandinter-drainage distribution of populations on genetic differentiation between bulltrout populations. The effect of distance between populations on genetic differentiationwas best explained by partitioning the effects of mainstem and tributary stream sections.Models that categorized barriers as having a one-way effect (i.e. allowed downstreamdispersal) or a two-way effect were best supported. Additionally, patch size and thedistribution of populations among drainages influenced genetic differentiation. Geneticdifferentiation between bull trout populations in Glacier National Park is linked tolandscape features that restrict dispersal. However, this analysis illustrates thatmodelling variability within landscape features, such as dispersal corridors, will benefitlandscape genetic analyses. Additionally, the framework used for evaluating the effectsof barriers must consider not just barrier presence, but also potential asymmetries inbarrier effects with respect to the organism under investigation.
- Type
- Journal Article
- Authors
- Meeuwig, Michael; Guy, Christopher; Kalinowski, Steven; Fredenberg, Wade
- Units
- CRCO , GLAC
- Keywords
- aquatic investigations, Barriers, Bull Trout, Fisheries, isolation by distance, landscape genetics, Salvelinus confluentus