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BioRisk 4: 851-854
doi:
10.3897/biorisk.4.47
Published:
06 Jul 2010
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Author
Jürg Zettel
- Corresponding author
University of Bern, Institute of Ecology and Evolution, Bern, Switzerland
Conflict of interest
The author has declared that no competing interests exist.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.