(Considering that the cell cycle of Skeletonema costatum is
about five days [12], we pay our attentions to the data in
the first seven days). For different light intensities, the growth of Skeletonema costatum is significantly different,especially after two days. Based on the cell number,
we can calculate the growth rates under different light intensities
using Equation (1). As is shown in Figure 2(b),