This surface microlayer, is a favorable environment for photoautotrophs since it offers an unrestricted spectrum of solar flux for photosynthesis. A variety of specialized adaptations in the unique flora that inhabit the neuston have been observed. The surface film acts a a gathering site for denatured organics that are relatively hydrophobic and its high level of surface tension acts as a barrier for microorganisms to cross. These organics act as a food source for the aforementioned heterotrophs and a large population of grazers which feed off of them. See Figure 9.11 for a pictorial description of the neuston and a discussion of the life cycle of one of its characteristic inhabitants Chromophyton .
Wetlands are areas of high productivity and low degradation.
The macrophytic plants grow on the surface of these structures, but once they die, they decompose slowly and result in a characteristic organic formation known as peats. For example, sphagnum moss growth can be compared tosponge on a plate. Beneath a thin layer of degrading plant material which is aerobic the so-called grey layer we find a zone of stabilized organic material which is virtually sterile. The sphagnum moss growth is self-limited by this growth habitat. Lakes See Figure 9.12.