1. Evolutionary Ecology Group, University of Antwerp, 2020 Antwerp, Belgium.
2. Center for Environmental Sciences and Engineering and Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT 06269–4210, USA.
3. Faculty of Sciences, University of Kisangani, Kisangani, D.R. Congo.
4. Royal Museum for Central Africa, 3080 Tervuren, Belgium.
5. ISOFYS Isotope Bioscience Laboratory, Ghent University, 9000 Ghent, Belgium.
6. Botanic Garden Meise, 1860 Meise, Belgium.
7. Royal Belgian Institute of Natural Sciences, 1000 Brussels, Belgium.
8. CAVElab Computational and Applied Vegetation Ecology, Ghent University, 9000 Ghent, Belgium.
9. Centre de Surveillance de la Biodiversité, University of Kisangani, Kisangani, D.R. Congo.