Distance at which Calanus finmarchicus initiated an escape reaction from the siphon in the dark and light.

Data tested with a Mann-Whitney ranked sum test. U Statistic = 1230.5 (p = 0.019).本数据采用曼-惠特尼秩和检验（Mann-Whitney ranked sum test）进行检验，所得U统计量为1230.5，p值为0.019。