Figure
1 . (a) Distribution of studies included in the meta-analyses (N=133).
Circle sizes are proportional to the number of studies. (b) Green space
in cities, such as parks and road verges can support diverse
pollinators. (c) Photos of representative pollinator taxa included in
our database, left to right: mammals (e.g., nectar-feeding bat), Aves
(Calypte anna ), Lepidoptera (Chaospes hemixantha ),
Hymenoptera (Halictus varentzowi ), Diptera (Allobaccha
apicalis ), and Coleoptera (Brentidae sp.). The first two photos were
adapted from Flickr under Creative Commons license CC BY 2.0., taken by
Doug Greenberg and Becky Matsubara, respectively. The other four photos
were by Dr. Xiao-Fang Jin.