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. 2014 Feb 13;7:66. doi: 10.1186/1756-3305-7-66

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Copyright © 2014 Caron et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Location of the 25 pond clusters (abbreviations) spread over five biogeographic regions in Belgium/Luxembourg: 1) Polders (BKNO, BUIT, BKLE, BDAM, BLAP), 2) Sand region (CKRU, CSTE, CHOU, CBOO, CMEC), 3) Loam region (DHAS, DZOU, DALK, DRIK, DDIE), 4) Chalk region (ESOR, EPES, EBEA, EFOC, EHAI), 5) Gutland (ANOB, ASCH, ABER, ACAP, AUSE).