Local farm management and landscape effects on native bee pollinators in agroecosystems

We compiled studies on pollinator communities on multiple farm sites within an agricultural landscape that was characterized by a gradient in land use intensity and could be spatially characterized by a GIS land cover map. We identified 39 suitable studies on 23 crops in 14 countries on 6 continents based on knowledge of the authors and previous synthetic work. Twenty-six studies have been published in peer-reviewed journals, while 13 were unpublished datasets. Author(s) of each study provided 1) data on bee abundance or visitation, and bee richness for sampled farm sites, 2) spatial locations of sites, 3) GIS data on multi-class land cover surrounding each site, 4) estimates of floral resource quality and nesting quality for different bee guilds for land-cover classes depicted in GIS maps, and 5) local farm management practices (organic or conventional; high or low vegetative diversity). For each study, we applied a quantitative, mechanistic model to predict relative abundance of wild bees for each farm site based on foraging distances and landscape composition data that were coded to capture estimated differences in nesting and floral resources. We also calculated metrics of landscape configuration to characterize heterogeneity, aggregation, patch shape complexity, and inter-patch connectivity surrounding each farm site. We tested the relative importance of landscape composition, landscape configuration, and local farm management as predictors of observed wild bee abundance and richness. These datasets and analyses are used in: C.M. Kennedy, Eric Lonsdorf, Maile C. Neel, Neal M. Williams, Taylor H. Ricketts, Rachel Winfree, Riccardo Bommarco, Claire Brittain, Alana L. Burley, Daniel Cariveau, Luísa G. Carvalheiro, Natacha P. Chacoff, Saul A. Cunningham, Bryan N. Danforth, Jan-Hendrik Dudenhöffer, Elizabeth Elle, Hannah R. Gaines, Claudio Gratton, Sarah S. Greenleaf, Andrea Holzschuh, Rufus Isaacs, Steven K. Javorek, Shalene Jha, Alexandra M. Klein, Kristin Krewenka, Yael Mandelik, Margaret M. Mayfield, Lora Morandin, Lisa A. Neame, Mark Otieno, Mia Park, Simon G. Potts, Maj Rundlöf, Agustin Sáez, Ingolf Steffan-Dewenter, Hisatomo Taki, Julianna K. Tuell, Blandina Felipe Viana, Ruan Veldtman, Catrin Westphal, and Claire Kremen. A global quantitative synthesis of local and landscape effects on native bee pollinators in agroecosystems. In preparation, Ecology Letters.