In marine ecosystems, the size
structure of phytoplankton is one of the factors that determine the energy
transfer efficiency in the food web. Therefore, spatiotemporal monitoring of the
wide-range phytoplankton-size structure is important for evaluating changes in the
marine ecosystem. Based on previous studies, the light absorption spectrum is
known to differ depending on the size and group of phytoplankton. Therefore, we
designed a method to estimate the phytoplankton-size structure based on the light
absorption spectrum.
Figure. Distributions of (a) CSD slope, which is an indicator of phytoplankton-size structure,
and (b) chlorophyll a (Chl. a).
Black contour line shows Chl. a
= 0.10 mg m-3.