Rapid trait evolution drives increased speed and variance in experimental range expansions.

ABSTRACT: Range expansions are central to two ecological issues reshaping patterns of global biodiversity: biological invasions and climate change. Traditional theory considers range expansion as the outcome of the demographic processes of birth, death and dispersal, while ignoring the evolutionary implications of such processes. Recent research suggests evolution could also play a critical role in determining expansion speed but controlled experiments are lacking. Here we use flour beetles (Tribolium castaneum) to show experimentally that mean expansion speed and stochastic variation in speed are both increased by rapid evolution of traits at the expansion edge. We find that higher dispersal ability and lower intrinsic growth rates evolve at the expansion edge compared with spatially nonevolving co

SUBMITTER: Weiss-Lehman C 

PROVIDER: S-EPMC5290145 | biostudies-literature | 2017 Jan

REPOSITORIES: biostudies-literature