I once saw a Purple Gallinule working its way through a bed of spatterdock, going from flower to flower and shredding each one as it sought pollinating insects. There is also a beautiful mosaic darner dragonfly, the spatterdock darner, Rhionaeschna mutata, that frequents spatterdock stands.
American lotus populations have exploded in size along Lake Erie over the past 15-20 years. It may be that long dormant seeds were triggered to germinate by increasingly favorable water levels or other environmental factors. The lotus plants that we see growing in luxuriance today may be the spawn of seeds that were shed before you were born.