Studies show that there are large spatial and temporal variations of
size-fractioned Chl a in the YS, and picophytoplankton is consistently
of absolute dominance (N40%) in the central YS when the YSCWM prevails
(Fu et al., 2009; Zhang et al., 2009). On the other hand, this deep
cold watermass is a key player in the spatial variations of the dominant
zooplankter, Calanus sinicus (Wang et al., 2009).