| Biotic Setting | Planktonic Biota |
| Biotic Class | Phytoplankton |
| Biotic Subclass | Cyanophyte Phytoplankton |
| Biotic Group | Cyanophyte Maximum Layer |
| Biotic Community | Trichodesmium Maximum layer |
| Definition | Relatively thin layer dominated by cyanophytes at depth in the water column. Cyanophytes can be found in a maximum layer where nutrients are sufficient (often at the base of the nutricline). They are often associated with an oxygen maximum layer due to their high rates of photosynthetic production. |