Upwelling
The major upwellings in the ocean are associated with the divergence of currents that bring deeper, colder, nutrient rich waters to the surface. There are at least five types of upwelling: coastal upwelling, large-scale wind-driven upwelling in the ocean interior, upwelling associated with eddies, topographically-associated upwelling, and broad-diffusive upwelling in the ocean interior.
Nymphoides peltata
"N. peltata" is a freshwater species and does not occur in waters with an average chlorinity exceeding about 300 mg/l. "N. peltata" is most commonly found in slow-moving rivers, lakes, ponds, and reservoirs, but it can also establish in swamps and wetlands. It is also known to occur in ditches, canals, break-through pools of dikes, and backwaters, especially those subject to winter flooding. The presence of N. peltata can signal an environment with water movement.