Global Drivers of Plant–Pollinator Interaction Specialization in Gardens

'). Our analysis of 40 plant-pollinator networks revealed that plant species richness was significantly influenced only by garden size and the degree of urbanization, with larger gardens supporting higher richness, and suburban gardens hosting more plant species than both rural and highly urbanized ones. Plant richness and precipitation positively influenced pollinator richness, but no association was found between specialization and environmental variables. Furthermore, the high species-specific variation in specialization with no phylogenetic signal implies that other plant traits than phylogeny could be driving plant-pollinator specialization in these systems. Our results suggest distinct factors drive species diversity and interaction specialization in urban gardens.