A food web in a pond

Imagine a pond, a hectic pond where various organisms from phytoplankton, small fishes, big fishes, waterfowl, to snake and owl doing their daily business. Beside that in an ecotone that mark the transition between aquatic ecosystem with terestrial ecosystem, some other organisms including various species of plants and animals are joining the business. You may have seen that sort of pond somewhere, share that with me please …