在赤道上升流区，浮游植物的生产力很少有季节性变化。
In the equatorial upwelling zone, there is very little seasonal change in phytoplankton productivity.
一旦条件成熟，浮游植物种群数量会呈爆炸性增长，这一现象被称为水华。
When conditions are right, phytoplankton populations can grow explosively, a phenomenon known as a bloom.
下一“章”：浮游植物的重要性。
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