The applicability of the realms scheme above - based on Udvardy (1975)—to most freshwater taxa is unresolved. According to the WWF, the following are classified as freshwater biomes:   Biomes of the coastal and continental shelf areas (neritic zone):   Example:  Pruvot (1896) zones or "systems":  Longhurst (1998) biomes:  Other marine habitat types (not covered yet by the Global 200/WWF scheme):  Humans have altered global patterns of biodiversity and ecosystem processes. As a result, vegetation forms predicted by conventional biome systems can no longer be observed across much of Earth's land surface as they have been replaced by crop and rangelands or cities. Anthropogenic biomes provide an alternative view of the terrestrial biosphere based on global patterns of sustained direct human interaction with ecosystems, including agriculture, human settlements, urbanization, forestry and other uses of land. Anthropogenic biomes offer a new way forward in ecology and conservation by recognizing the irreversible coupling of human and ecological systems at global scales and moving us toward an understanding of how best to live in and manage our biosphere and the anthropogenic biomes we live in.  Major anthropogenic biomes:  The endolithic biome, consisting entirely of microscopic life in rock pores and cracks, kilometers beneath the surface, has only recently been discovered, and does not fit well into most classification schemes.