Profiles of salinity (A), temperature (B), irradiance and phytoplankton abundance (C) along the estuarine gradient.

<p>(Stations A→F). Black dots on the profile (<b>A</b>) represent sampling points collected for the global phytoplankton analysis by microscopy, and the blue dots indicate those analyzed by both microscopy and clone library approaches. A logarithmic scale was used for the representation of phytoplankton cell abundance on the profile of irradiance(<b>C</b>).</p>