1. Institute of Environmental Sciences (CML) Leiden University Box 9518 2300 RA Leiden The Netherlands
2. Naturalis Biodiversity Center Darwinweg 2 2333 CR Leiden The Netherlands
3. BaseClear B.V Sylviusweg 74 2333 BE Leiden the Netherlands
4. Department of Biological Sciences University of Arkansas, 1 University of Arkansas Fayetteville Arkansas 72701 USA
5. Diatomella IJkelaarstraat 3 6611 KN Overasselt The Netherlands
6. Meise Botanic Garden Meise, Research Department Nieuwelaan 38 1860 Meise Belgium
7. University of Antwerp, Department of Biology – ECOBE Universiteitsplein 1 B‐2610 Wilrijk Belgium
8. IRTA‐Institute for Food and Agricultural Research and Technology, Marine and Continental Waters Programme Ctra de Poble Nou Km 5.5, E43540, La Ràpita Catalonia Spain
9. Royal Botanic Garden Edinburgh EdinburghEH3 5LR ScotlandUK
10. Bayer Crop Science Leeuwenhoekweg 52 2661 CZ Bergschenhoek The Netherlands
11. Radboud Institute for Biological and Environmental Sciences Heyendaalseweg 135 6500 GL Nijmegen The Netherlands