Model suggests genetic backburn may inhibit rapid spread of invasive species

February 24, 2016 by Bob Yirka report
Cane toad
Cane toad. Credit: Wikipedia.

(—A trio of Australian researchers is proposing in a paper they have had published in the journal Proceedings of the Royal Society B, that using a technique developed to prevent the spread of wildfires might also help slow the spread of an invasive species. They have created a computer model that shows that using backburning inhibits the spread of a virtual organism.

One of the techniques forest or bush firefighters use to halt the spread of a fire is backburning, where controlled fires are set ahead of the path of the encroaching blaze—once the original fire reaches the area of the controlled burn, it stops, because all of the fuel in the area has already been burned. In this new effort, the researchers wondered if a similar approach might not work to help slow the spread of an , such as , which were introduced into Australia back in 1935—since that time they have spread from areas in Queensland, where they were supposed to help battle beetles that were causing major problems in sugarcane fields. Unfortunately, the poisonous frogs proved to be heavily invasive, moving and taking over territory formerly inhabited by other species.

Previous research has shown that for most invasive species there are some individuals in a group that are more invasive than others—it is the individuals out front that are mostly responsible for the spread into new territory. But, what if those individuals that were strong and healthy, but who were not necessarily all that interested in moving to new territory, were artificially moved to areas ahead of where the invasive species was believed to be moving? If they multiplied in that area and were there when the rest of their group arrived later, they would outnumber the incoming crowd and overwhelm them, and in the process, cause a reduction in the degree of invasiveness of the group as a whole.

To find out if such an idea were even worthy of consideration, the team created a virtual world as part of a computer simulation, filled with virtual hermaphrodite creatures. Some were programmed to be eager invaders, while others were programmed to be homebodies—the eager creatures were placed at the outskirts of the two-dimensional world where they would naturally attempt to march into new territory. Once the virtual world was set in motion, the researchers than moved some of the homebody creatures to an area where the group was clearly set to invade, and then watched what happened.

The team reports that the invasion was clearly slowed by the technique and are now wondering if it might work in the real world. There is no word yet on whether authorities in Australia will allow such an experiment, but if they do, and the plan works, the technique will undoubtedly be tried in other areas as well.

Explore further: European fire ant impacts forest ecosystems by helping alien plants spread

More information: The genetic backburn: using rapid evolution to halt invasions, Published 24 February 2016.DOI: 10.1098/rspb.2015.3037 .

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.

Related Stories

Cane toads can be stopped

December 12, 2012

It may be possible to stop the spread of can toads into new areas of Australia according to new research published today in the Journal of Applied Ecology.

Recommended for you

New analysis of big data sheds light on cell functions

October 26, 2016

Researchers have developed a new way of obtaining useful information from big data in biology to better understand—and predict—what goes on inside a cell. Using genome-scale models, researchers were able to integrate ...

Researchers identify genes for 'Help me!' aromas from corn

October 25, 2016

When corn seedlings are nibbled by caterpillars, they defend themselves by releasing scent compounds that attract parasitic wasps whose larvae consume the caterpillar—but not all corn varieties are equally effective at ...

Structure of key DNA replication protein solved

October 25, 2016

A research team led by scientists at the Icahn School of Medicine at Mount Sinai (ISMMS) has solved the three-dimensional structure of a key protein that helps damaged cellular DNA repair itself. Investigators say that knowing ...

Genome editing: Efficient CRISPR experiments in mouse cells

October 25, 2016

In order to use the CRISPR-Cas9 system to cut genes, researchers must design an RNA sequence that matches the DNA of the target gene. Most genes have hundreds of such sequences, with varying activity and uniqueness in the ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.