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Running off the road

[caption id="attachment_3639" align="alignright" width="400"] Mountain roads – and the cars and people on them – facilitate non-native species movement up to high elevations. Here: Davos, Switzerland It is a familiar pattern by now, confirmed over and over in virtually all mountain regions we study: roads are facilitating the introduction of non-native plant species into mountains. Humans introduce – on purpose or by accident – new species in the valleys, and from there they start spreading uphill. On their way towards high elevations, mountain roads serve as a great highway. But with increasing elevation, fewer and fewer non-natives will be found, as they progressively drop out the higher you get. The few that make it all the way to the top by road could possibly spread from there into the natural mountain vegetation, but even fewer species manage that. All of that we knew, indeed, but a crucial question remains: who wins this...
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