Contrasting patterns of genetic and phenotypic differentiation in two invasive salmonids in the southern hemisphere.

ABSTRACT: Invasion success may be expected to increase with residence time (i.e., time since first introduction) and secondary releases (i.e., those that follow the original introduction), but this has rarely been tested in natural fish populations. We compared genetic and phenotypic divergence in rainbow trout and brown trout in Chile and the Falkland Islands to test the prediction that adaptive divergence, measured as P ST/F ST, would increase with residence time and secondary releases. We also explored whether interspecific competition between invaders could drive phenotypic divergence. Residence time had no significant effect on genetic diversity, phenotypic divergence, effective population size, or signatures of expansion of invasive trout. In contrast, secondary releases had a major effect on

SUBMITTER: Monzon-Arguello C 

PROVIDER: S-EPMC4211722 | biostudies-literature | 2014 Sep

REPOSITORIES: biostudies-literature