marine

• constant salinity: stenohaline (species that tolerate only a narrow range of salinity) thrive in these conditions
• constant oxygen concentration: species that require consistent oxygen levels live here
• low levels of sedimentation: there are low levels of mechanical disturbance in marine environments, especially in pelagic ecosystems. This provides a clear line of sight for organisms reliant on their eyesight
• consistent temperature: species that require a narrow range of temperatures to survive will do well in such environments.