bioRxiv preprint doi: https://doi.org/10.1101/2021.03.10.434823; this version posted March 10, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 Five years of citizen science and standardized field surveys reveal 2 a threatened urban Eden for wild bees in Brussels, Belgium 3 4 Nicolas J. Vereecken1*, Timothy Weekers1, Leon Marshall1, Jens D’Haeseleer2, Maarten 5 Cuypers2, Pieter Vanormelingen2, Alain Pauly3, Bernard Pasau4, Nicolas Leclercq1, Alain 6 Tshibungu1, Jean-Marc Molenberg1 & Stéphane De Greef1 7 8 1 Agroecology Lab, Université Libre de Bruxelles, Brussels, Belgium. 9 2 Natuurpunt Studie, Mechelen, Belgium. 10 3 Directorate Taxonomy & Phylogeny, Royal Belgian Institute of Natural Sciences, Brussels, 11 Belgium. 12 4 Natagora Bruxelles, Mundo-B, Bruxelles , Belgium. 13 14 15 * Correspondence to: N.J. Vereecken, Agroecology Lab, Université libre de Bruxelles 16 (ULB), Avenue F.D. Roosevelt 50, B-1050 Bruxelles, Belgium. E-mail: 17
[email protected] 18 19 Manuscript title: Five years of citizen science and standardized field surveys reveal a 20 threatened urban Eden for wild bees in Brussels, Belgium 21 Manuscript running title: Urban wasteland and wild bee diversity 22 23 Short communication 24 25 1 bioRxiv preprint doi: https://doi.org/10.1101/2021.03.10.434823; this version posted March 10, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 26 Abstract. 1. Urbanisation is often put forward as an important driver of biodiversity loss, 27 including for pollinators such as wild bees.