Earthworms harm biodiversity! Most research points to distressed researchers in Minnesota, so the overview is from them:
The Earthworm is an *Invasive species*, or introduced non-native one. It's the same worms in northern boreal forests in Russia and in the Great lakes area. high risk of contamination.
Proulx, Nick. "Ecological Risk Assessment of Non-indigenous Earthworm Species."
http://www.nrri.umn.edu/worms/research/publications/Tiunov%20et%20al%202006.pdf
-- environmental, political, and economic considerations of earthworms on hardwood forests. (includes map!) they move about 10m per year on their own. again though, high risk of contamination.
Earthworms are harmful to biodiversity. Effects and analysis of specific forests, includes regression.
http://www.nrri.umn.edu/worms/research/publications/Holdsworth_etal_CB_2007.pdf
The Earthworm is an *Invasive species*, or introduced non-native one. It's the same worms in northern boreal forests in Russia and in the Great lakes area. high risk of contamination.
Proulx, Nick. "Ecological Risk Assessment of Non-indigenous Earthworm Species."
http://www.nrri.umn.edu/worms/research/publications/Tiunov%20et%20al%202006.pdf
-- environmental, political, and economic considerations of earthworms on hardwood forests. (includes map!) they move about 10m per year on their own. again though, high risk of contamination.
Earthworms are harmful to biodiversity. Effects and analysis of specific forests, includes regression.
http://www.nrri.umn.edu/worms/research/publications/Holdsworth_etal_CB_2007.pdf
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