Aggregates in the bottom layer were much smaller than those in the upper and middle layer because of the turbulence in the bottom of the water column.
底层颗粒物聚合体大小明显小于上、中层聚合体，可能与水体底部湍流有关。
Longer chains affect sinking rates and thus likely help the diatom remain suspended in the upper part of the water column where physical and chemical parameters are more favorable for growth.
长链似乎降低了细胞的下沉速率，有助于硅藻生活在理化条件都比较适合生长的水体上层。
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