Denitrification proceeds in anaerobic areas but nitrification may be slowed due to light limitation caused by ice cover and short day length. The large quantities of organic material offer a buffering capacity from the carbonate-bicarbonate cycle. Virtually all are unique depending upon objectives. Enhancement wetlands are designed to not only reclaim wastewaters but also provide other values such as recreation, educational opportunities, and wildlife habitat. An abundance of oxygen is typically found in the deep water areas, especially near the surface.
Nitrification occurs here.
Particulate matter is quickly filtered out. Dissolved metals are removed as well. Permanent water bodies typically have very few mosquitoes. A hollow tree trunk that retains rainwater for a few days, a puddle, a discarded tire, an old paint can, a low spot in rain gutters are some of the most likely breeding grounds of mosquitoes. The air breathing larval form are large, easy to see and catch as they are such poor swimmers.