determined by marine biome envoPolar marine realm SPIRE:Marine This biome includes open-ocean and unprotected coastal ecosystems, characterized by exposure to wave action, tidal fluctuation, and ocean currents as well as systems that largely resemble these. Water in the marine biome is generally within the salinity range of seawater: 30 to 38 ppt. An aquatic biome which is determined by a marine water body. marine water body aquatic biome marine ecosystem