Lowland rivers with slow continuous flows up to 10,000m³/s are common at low elevations throughout tropical and temperate parts of the world. These are productive ecosystems with major energy and fine sediment inputs from floodplains and upper catchments. Zooplankton can be abundant, along with aquatic plants and diverse communities of fish able to tolerate a range of temperatures and oxygen concentrations, as well as reptiles, birds, and mammals that depend wholly or partly on lowland lotic aquatic habitats.