Ayre, Bronwyn M.Roberts, David G.Phillips, RyanHopper, Stephen D.Krauss, Siegfried L2020-06-110305-7364http://hdl.handle.net/1885/204932Background and Aims: In plants, the spatial and genetic distance between mates can influence reproductive success and offspring fitness. Negative fitness consequences associated with the extremes of inbreeding and outbreeding suggest that there will be an intermediate optimal outcrossing distance (OOD), the scale and drivers of which remain poorly understood. In the bird-pollinated Anigozanthos manglesii (Haemodoraceae) we tested (1) for the presence of within-population OOD, (2) over what scale it occurs, and (3) for OOD under biologically realistic scenarios of multi-donor deposition associated with pollination by nectar-feeding birds.application/pdfen-AU© The Author(s) 2019. Published by Oxford University Press on behalf of the Annals of Botany Company.201910.1093/aob/mcz0912019-12-19