Road age effects
This study examined earthworm occurrence in relation to road age at 98 roads in northern Alberta. Earthworms were more likely to be found at older roads and to have spread farther from the road at those locations. This may be related to the fact that older roads are typically subject to higher cumulative levels of human disturbance than younger roads.
We used our results to create a model of earthworm spread in relation to road development. Our model indicated that approximately 9% of northeastern Alberta is likely currently invaded by earthworms. However, in the next 50 years, 49% of this region is predicted to be invaded as development intensifies.
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