| Biotic Setting | Planktonic Biota |
| Biotic Class | Floating/Suspended Plants and Macroalgae |
| Biotic Subclass | Floating/Suspended Macroalgae |
| Biotic Group | Algal Rafts |
| Biotic Community | Gracilaria Rafts Kelp Rafts Rockweed Rafts Sargassum Rafts Ulva Rafts |
| Definition | Thick mats composed of macroalgae that either float on the surface or are submerged in the water column. Some species primarily float (e.g., Kelp Rafts, Rockweed Rafts, and Sargassum Rafts), while others may both float and sink (e.g., Gracilaria Rafts and Ulva Rafts). |