In response to a question raised during my IPC talk on soil, Dan Halsey has confirmed that European earthworms are indeed invasive and damaging to forest eco-systems in North America. To those of us (Europeans) obsessed with worms as an indicator of good soil health, this comes as quite a shock. You can read Dan's enlightening paper on the subject here. Thanks for the submission Dan.

The Permaculture Research Digest provides summaries of newly published permaculture-related research. All items are
hyper-linked to the original publication.
If you have any items to feature in the digest please e-mail research@permaculture.org.uk
The 'January 2013' archive contains 60 items published in 2012.
Items marked with a # have restricted public access, although abstracts are freely available.
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