| In general, the euphotic zone can extend to depths of 80 to 100 metres and the disphotic zone to depths of 80 to 700 metres. |
| Indeed, the MLD maximum, usually reached in late winter determines the annual nutrient reloading of the euphotic zone. |
| Phytoplankton, which like all plants require light, are concentrated in the euphotic zone. |
| The euphotic zone is the layer closer to the surface that receives enough light for photosynthesis to occur. |
| The deeper waters are a reservoir of nutrients, and the primary supply pathway for the euphotic zone. |
| Therefore the physical nutrient supply in the euphotic zone is a measure of the impact of the physical mechanisms on the primary production. |
