Depending upon your prevailing climate there are some plants that are known to go wild and clog waterways. Some of those plants are Water Hyacynth, Water Lettuce, Azola, Riccia, and Myriophyllum.
because land snails normally stay on land and pond snails stay in the water
you need to stay away from plants that causes bugs. Kevin K
The water tension keeps them from sinking
Plants have to have water so they can grow and stay hydrated.
Yes, several animals and plants can float on the surface of a pond. For example, many species of water lilies and duckweed are aquatic plants that thrive on the water's surface, while animals such as frogs and certain insects like water striders can also be found floating or resting on the water. These organisms have adaptations that allow them to stay buoyant, such as air-filled structures or lightweight bodies.
try to stay away from all moving water
They are either looking for warmth or oxygen. If there is not enough oxygen in the water they will stay on top and breathe air, you need some kind of aerification for them as well as the water to keep the pond healthy.
Protozoans meet its basic needs by having to stay in water, it can be in clear pond water or sea water with salt. That is why they are found in pond water which is what its states in my college textbook. Hopefully this helps you in what you need to do in either a project or homework. :)
Wilting occures when there is not enough water for the plant to stay alive. All plants will wilt if not givin enough water.
statues of birds will usually deter an egret. also, your pond should be deep enough for the koi to stay out of range, at least 36 inches deep. i have rock ledges in my pond for the fish to hide under. if your pond has a ledge, fill it with plants so there is nowhere for the bird to stand.
Water and nutrients
Some plants, like water hyacinth, float in water. They have special types of leaves that help them to stay afloat.