Symposium “Pollinator conservation in urban and agricultural environments: comparison of management practices” Talk 3. Arthur FAUVIAU, PhD student, Institut d’Ecologie et des Sciences de l’Environnement de Paris, Sorbonne-Université, Paris, France Email: arthur.fauviau@sorbonne-universite.fr Title: “How does urbanization impact on wild bees taxonomic and functional diversity? A large-scale study on three European countries” The expansion of urban habitats and associated land-use changes is one of the main drivers of the current decline of pollinating insects. However, effects of urbanization on pollinator communities are still unclear, as shown by contrasting reports on their species and functional diversities in urban habitats. Therefore, assessing how the management practices of these habitats impact on pollinating insect communities becomes increasingly important. Indeed, if recent studies emphasize on abundant and diverse pollinator communities in cities, they also point out the need to better manage urban areas to allow pollinators to persist. In the present study, we use a large dataset, encompassing pollinating insects surveys carried out in 20 cities of three West European countries (France, Belgium and Switzerland). Our objective is to link pollinator taxonomic and functional diversity to urban green spaces characteristics. To do so, we will analyze species richness in relation with the quantity of urban green spaces, their management practices and their connectivity in each city. We will also test if functional diversities of pollinator assemblages are related to these urban characteristics. As all cities do not equally affect pollinating insect communities, the results presented here will give important insights on the urban factors responsible for these differences.