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 controls. Furthermore, evolution of these traits is variable, leading to enhanced variance in speed among replicate population expansions. Our results demonstrate that evolutionary processes must be considered alongside demographic ones to better understand and predict range expansions.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Weiss-Lehman C,Hufbauer RA,Melbourne BAdoi
10.1038/ncomms14303subject
Has Abstractpub_date
2017-01-27 00:00:00pages
14303issn
2041-1723pii
ncomms14303journal_volume
8pub_type
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