Is heterospecific pollen receipt the missing link in understanding pollen limitation of plant reproduction?

How will anthropogenic changes (species invasions/extinctions, land-use conversion, and climate change) influence the pollination and reproductive success of the world's angiosperms, 85% of which require animal pollination (Ollerton et al., 2011)? Answering this question requires understanding the mechanisms that cause pollen limitation of seed production. Pollen limitation (PL) is widespread (Bennett et al., 2018) and occurs when pollinators...