RT Journal Article SR Electronic T1 Floral resource-landscapes and pollinator-mediated interactions in plant communities JF bioRxiv FD Cold Spring Harbor Laboratory SP 022533 DO 10.1101/022533 A1 Henning Nottebrock A1 Baptiste Schmid A1 Katharina Mayer A1 Céline Devaux A1 Karen J. Esler A1 Böhning-Gaese Katrin A1 Matthias Schleuning A1 Jörn Pagel A1 Frank M. Schurr YR 2015 UL http://biorxiv.org/content/early/2015/07/16/022533.abstract AB Plant communities provide floral resource-landscapes for pollinators. Yet, it is insufficiently understood how these landscapes shape pollinator-mediated interactions among multiple plant species. Here, we study how pollinators and the seed set of plants respond to the distribution of a floral resource (nectar sugar) in space and across plant species, inflorescences and flowering phenologies. In a global biodiversity hotspot, we quantified floral resource-landscapes on 27 sites of 4 ha comprising 127,993 shrubs of 19 species. Visitation rates of key bird pollinators strongly depended on the phenology of site-scale resource amounts. Seed set of focal plants increased with resources of conspecific neighbours and with site-scale resources, notably with heterospecific resources of lower quality (less sugar per inflorescence). Floral resources are thus a common currency determining how multiple plant species interact via pollinators. These interactions may alter conditions for species coexistence in plant communities and cause community-level Allee effects that promote extinction cascades.