1. Under future global warming, increasing temperature may productive euphotic zone . 2. Areas of upwelling provide supplies of nitrogen from below the euphotic zone . 3. The abyss also exerts significant influence upon ocean euphotic zone . 4. In such areas the euphotic zone may be only a few tens of metres deep or less. 5. This mixing replenishes nutrients from depth to the surface waters and the rest of the euphotic zone . 6. Nutrients remain below the euphotic zone for most of the year, resulting in low primary production. 7. Most phytoplankton are too small to be seen individually with the euphotic zone ) of the sea. 8. In such areas the euphotic zone may be only a few tens of meters deep or less. 9. For example, wind blowing parallel to the coast causes euphotic zone due to the influx of nutrients. 10. Maximum numbers of bacteria generally occur at the pycnocline, where phytodetritus accumulates by sinking from the overlying euphotic zone .
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