ALT Co-occurring Burmeistera species experience limited reproductive interference despite high rates of pollen transfer between them mediated by their shared nectar bat pollinators.

ALT A calliphorid fly visits a Moraea lurida flower. As it squeezes past the anther, a thick layer of pollen is deposited on the head and thorax of the fly. The authors of this article demonstrate that pollen layers from sequentially visited flowers can build up like a “layer cake”, which may affect which pollen grains are most likely to get deposited on the stigmas of subsequently visited flowers. Furthermore, they demonstrate that pollen layers may preclude the deposition of new pollen grains so that the bodies of flies become arenas for male-male competition to take place.