EVIDENCE. “Direct evidence for the trade-off hypothesis is sparse, and observations consistent with it come from hermaphroditic great pond snails, which reallocate resources to female function when sperm production is experimentally abolished, and from strawberries, in which increased pollen production comes at the cost of reduced seed set.”
http://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.1001899