investigated the spatiotemporal variability of
the photosynthetic parameters of phytoplankton in the Sea of Okhotsk
during the late summer of 2006 and found that the photoacclimation
strategy of algal communities could be related to the
Amur River discharge. In the summer of 2006, Suzuki et al.
(2014) investigated the spatial variability of the Fe nutritional status
of microplankton-size diatoms by performing diatom-specific
immunochemical ferredoxin and flavodoxin assays and active
chlorophyll fluorescence measurements to determine the maximum
photochemical quantum efficiency. In addition, Yoshimura
et al. (2010) and Sugie et al. (2013) performed Fe-addition bioassay
incubation experiments in the summers of 2006 and 2007 and
identified a distinct gradient in the Fe nutritional status of diatoms
from near the Amur River mouth to open waters in the Sea of Okhotsk.
These results suggest that Fe discharged from the Amur River
is a key factor determining the photophysiology of the large diatoms
near Sakhalin Island in the Sea of Okhotsk, whereas in the
vicinity of the Kuril Islands, both Fe and light may limit microplankton-
sized diatoms. Jing et al. (2010) examined cyanobacterium
Synechococcus phylotypes in the Sea of Okhotsk, and found
their unique distributions in connection with the Amur River
discharge.