Constant high temperature and high seasonal rainfall variability in tropical freshwater ecosystems support different forms of life. Fresh water flora and fauna in the equatorial belt conceals a rich history of its own origin. Some species of plants and animals developed from ancient marine ancestors, while others remained isolated on the mainland after the separation of the supercontinent Pangea. Seasonal rainfall causes massive flooding, which subsequently expands the whole habitat. The amount of rain depends on the shape of the continent, the presence of mountain ranges and wind patterns. These conditions facilitate the growth and development of various communities, with aquatic plants and various other food sources being available throughout the whole year.