東京湾奥域における主要植物プランクトンとDIN:DIP比等との相互関係 Relationships between the Dominant Phytoplankton and DIN:DIP Ratios in the Inner Part of Tokyo Bay
The relationships between the dominant phytoplankton and the water quality factors were examined at two stations in the inner part of Tokyo Bay.<br>Monthly changes of water quality factors in the inner part of Tokyo Bay showed that DIN (dissolved inorganic nitrogen): DIP (dissolved inorganic phosphorus) ratio was high in February and March and low in October and November, while TN (total nitrogen): DIN ratio was low in January and February and high in August and September.<br>The relationships between the dominant phytoplankton and the water quality factors were considerably variable and complex. <i>Skeletonema costatum, Heterocapsa triquetra, Eucampia zodiacus, Chaetoceros didymum</i>, and <i>Chaetoceros radicans</i> occurred in waters with comparatively high DIN:DIP ratio (>80), <i>Ceratium fusus, Ceratium lineatum, Rhizosolenia fragilissima</i>, and <i>Leptocylindrus danicus</i> did in waters with moderate DIN:DIP ratio, and <i>Heterosigma akashiwo, Prorocentrum minimum, Gonyaulax verior</i>, and <i>Chaetoceros debile</i> did in waters with comparatively low DIN:DIP ratio (<50). DIN:DIP ratio in waters where dominant phytoplankton occurred tended to decrease with increased TN×TP and WT.
日本水産学会誌 64(2), 259-263, 1998-03-15