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Evolution drives how fast plants could migrate with climate change: UBC study

Friday, July 29, 2016
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Vancouver: New research from the University of British Columbia suggests evolution is a driving mechanism behind plant migration, and that scientists may be underestimating how quickly species can move.


The study, published today in the journal Science, builds on previous research that has shown some plants and animals are moving farther north or to higher altitudes in an effort to escape rising global average temperatures due to climate change.

“We know from previous research that evolution might play a role in how fast a species can move across a region or continent,” said Jennifer Williams, the study’s lead author and an assistant professor in UBC’s department of geography. “But what our study suggests is that evolution is not only a factor in movement, but that it can, in fact, accelerate the spread, and can do so predictably.”

For the study, researchers used a small flowering plant (Arabidopsis thaliana), a common model organism in plant biology, to test the role of evolution in plant migration. Individual plants with different traits were cultivated together to create two sets of populations, one in which evolution was acting and another in which evolution was stopped.

They found that, after six generations, evolving plant populations dispersed seeds and migrated 11 per cent farther than non-evolving populations in landscapes with favourable conditions. Meanwhile, in landscapes where conditions were more challenging for the plants to disperse seeds, the evolving plant populations spread 200 per cent farther.

continous-landscape-770

Evolving plant populations dispersed seeds and migrated 11 per cent farther in landscapes with favourable conditions, as shown here. Credit: Jonathan Levine
The findings suggest that evolution accelerates the speed of migration, said Williams.

However, more research is needed to determine why the researchers saw a larger effect of evolution under the more challenging conditions, which in this case increased the speed of movement.

“We know, for example, that there are some species of butterflies and plants that are expanding their ranges with climate change and moving north or up in elevation,” she said. “What our results suggest is that, with evolution, the species can move faster and faster because the traits that make them better at moving are becoming more common at the front of the invasion. In the case of our plants, in the evolving populations, their seeds can disperse a bit further.”

Patchy-Landscape-770

Evolving plant populations spread 200 per cent farther in landscapes like this where conditions were more challenging for plants to disperse seeds. Credit: Jonathan Levine
Williams said the findings underscore the importance for scientists to account for evolutionary change when predicting how quickly native species will be able to move as the Earth’s climate continues to warm.

The study was co-authored by Bruce Kendall of the University of California, Santa Barbara, and Jonathan Levine of the ETH Zurich.
 
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