Standing bodes of water range from small ponds to large lakes.
Oligotrophic lakes are nutrient-poor and generally oxygen-rich.
Eutrophic lakes are nutrient rich and often depleted of oxygen.
Seasonal turnover in temperate regions allow mixing of oxygen and nutrients.
Rooted and floating aquatic plants live in the littoral zone, the shallow, well-lighted waters close to shore.
The limnetic zone is inhabited by phytoplankton and cyanobacteria.