The 6 terrestrial ecosystems are tundra, taiga, temperate deciduous forest, tropical rain forest, grassland, and desert, these are distinguished from aquatic ecosystem by the limited supply of water. The two types of aquatic ecosystems are marine and freshwater.
Terrestrial productivity is more effective in the wet tropical climates as the net primary productivity decreases between equatorial and polar regions due to less sunlight and therefore there is a temperature decrease. Global productivity is limited by factors of water and sun, as most ecosystems rely on photosynthesis and water. Marine productivity tends to be higher, as rivers and water carry more nutrients and deposit them in other ecosystems. The most productive regions are areas such as wetlands and estuaries.
