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Measuring abundance of phytoplankton with a Secchi Disc

The distribution, composition and abundance of phytoplankton is altering as oceans are affected by climate change. By lowering a Secchi Disk vertically into the sea from a stationary vessel, citizen scientists are able to record the ‘Secchi Depth’. This is the depth when the Secchi Disk disappears from sight. The Secchi Depth measures the clarity of seawater which, away from estuaries and coasts, indicates the amount of phytoplankton at the sea surface.

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