Data and analysis scripts for: Co-occurrence patterns at four spatial scales implicate reproductive processes in shaping community assembly in clovers

1. Competition, niche differences, and chance all contribute to community assembly, yet the role of reproductive interactions between species is often less appreciated. Closely related plant species that share floral form, phenology, and habitat often interact through pollination. They potentially facilitate pollinator attraction, compete for pollination services, and/or exchange pollen. If reproductive processes are important to co-occurrence, we predicted that fitness costs of heterospecific pollen transfer or pollen limitation should result in lower rates of co-occurrence among outcrossing congeners. In contrast, selfers, which may be less exposed to heterospecific pollen, and/or less negatively affected by it, should co-occur more frequently. 2. Flower size is an excellent proxy for mating system in clovers. Using herbarium records and three independent field datasets, we documented co-occurrence patterns of Trifolium at 1m2 - 1km2 scales in California. Using a randomization procedu...