Tada K, Morishita M, Hamada K, Montani S, Yamada M
Kagawa University, Kida-gun, Japan.
Mar Pollut Bull. 2001 Nov;42(11):1177-86. doi: 10.1016/s0025-326x(01)00136-9.
The seasonal variation of phytoplankton biomass and primary productivity in a heavily eutrophic embayment, Dokai Bay, Japan, was determined. Dokai Bay was characterized by high phytoplankton biomass and productivity during summer and low phytoplankton biomass and productivity during other seasons. The results suggested that phytoplankton growth was limited by only irradiance and water temperature under the high nutrient concentrations available for phytoplankton growth in the entire year. Moreover, in spite of sufficient nutrient for phytoplankton growth in the entire year, a red tide occurred only in the summer period in this bay. Our results suggested that a red tide occurred by the high phytoplankton growth rate in the summer season, but in other periods surface phytoplankton was flushed out of the bay before forming the red tide, because phytoplankton growth rate was low and could not form the red tide due to low irradiance and low water temperature.
对日本洞海湾这个富营养化严重的海湾中浮游植物生物量和初级生产力的季节变化进行了测定。洞海湾的特点是夏季浮游植物生物量和生产力较高，而其他季节浮游植物生物量和生产力较低。结果表明，在全年浮游植物生长可利用的高营养浓度条件下，浮游植物生长仅受光照和水温限制。此外，尽管全年有足够的浮游植物生长所需营养，但该海湾仅在夏季出现赤潮。我们的结果表明，赤潮是由夏季浮游植物的高生长率导致的，但在其他时期，表层浮游植物在形成赤潮之前就被冲出了海湾，因为浮游植物生长率低，且由于光照不足和水温低而无法形成赤潮。
