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BioRisk 8: 89-110
doi: 10.3897/biorisk.8.4035
Approved: 19 Mar 2013 | Published: 08 Aug 2013
This article is part of:
BioRisk 8
Authors
Ulrich Sukopp - Corresponding author
Federal Agency for Nature Conservation, Bonn, Germany
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Ulf Schmitz
Universität Düsseldorf, Düsseldorf, Germany
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Conflict of interest
The authors have declared that no competing interests exist.
Supporting agencies
Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (BMU, Germany), Federal Agency for Nature Conservation (BfN, Germany)
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.
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