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