10.1371/journal.pone.0104679.g003 Laura Fortel Laura Fortel Mickaël Henry Mickaël Henry Laurent Guilbaud Laurent Guilbaud Anne Laure Guirao Anne Laure Guirao Michael Kuhlmann Michael Kuhlmann Hugues Mouret Hugues Mouret Orianne Rollin Orianne Rollin Bernard E. Vaissière Bernard E. Vaissière Effect of impervious surface percentage within 500 m on the abundance and species richness of bees. Public Library of Science 2014 urbanization gradient proportion Wild Bee Community Species richness bee species Urbanization Gradient BackgroundWild bees bee community site surface 2014-08-13 03:21:11 Figure https://plos.figshare.com/articles/figure/_Effect_of_impervious_surface_percentage_within_500_m_on_the_abundance_and_species_richness_of_bees_/1137516 <p>A. Abundance of bees (filled circles = 2011, open circles = 2012); B. Species richness of bees (filled circles and full line = 2011, open circles and dashed line = 2012). Model for species richness  =  Impervious surface (Year) + Impervious surface<sup>2</sup> (Year).</p>