The genetic backburn: using rapid evolution to halt invasions

Phillips, Ben L., Shine, Richard, and Tingley, Reid (2016) The genetic backburn: using rapid evolution to halt invasions. Proceedings of the Royal Society of London Series B, Biological Sciences, 283 (1825). 20153037. pp. 1-9.

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The impact of an invasive species depends upon the extent of area across which it ultimately spreads. A powerful strategy for limiting impact, then, is to limit spread, and this can most easily be achieved by managing or reinforcing natural barriers to spread. Using a simulation model, we show that rapid evolutionary increases in dispersal can render permeable an otherwise effective barrier. On the other hand, we also show that, once the barrier is reached, and if it holds, resultant evolutionary decreases in dispersal rapidly make the barrier more effective. Finally, we sketch a strategy the genetic backburn in which low-dispersal individuals from the range core are translocated to the nearside of the barrier ahead of the oncoming invasion. We find that the genetic backburn by preventing invasion front genotypes reaching the barrier, and hastening the evolutionary decrease in dispersal can make barriers substantially more effective. In our simulations, the genetic backburn never reduced barrier strength, however, the improvement to barrier strength was negligible when there was substantial long-distance dispersal, or when there was no genetic variation for dispersal distance. The improvement in barrier strength also depended on the trade-off between dispersal and competitive ability, with a stronger trade-off conferring greater power to the genetic backburn.

Item ID: 44202
Item Type: Article (Research - C1)
ISSN: 0962-8452
Keywords: barrier, contemporary evolution, invasive species, spatial sorting, targeted gene flow
Funders: Australian Research Council (ARC)
Projects and Grants: ARC DP1094646
Date Deposited: 18 May 2016 07:34
FoR Codes: 41 ENVIRONMENTAL SCIENCES > 4102 Ecological applications > 410202 Biosecurity science and invasive species ecology @ 40%
41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410404 Environmental management @ 60%
SEO Codes: 96 ENVIRONMENT > 9606 Environmental and Natural Resource Evaluation > 960604 Environmental Management Systems @ 100%
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