Notice how the upwelling area exhibits higher chlorophyll
levels. However, the phytoplankton bloom does not exactly correspond
to the upwelled water signal. This imperfect correlation occurs for
two reasons: 1) it takes time for the phytoplankton to respond to
the upwelled nutrients, so there is an offset in time between the
two features, and 2) phytoplankton may also obtain nutrients from
other sources, such as terrestrial runoff, for growth.
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![Phytoplankton Response to Upwelling](images/cuff2.gif) |