441095 small.jpg from discovery reports 1935 1936 discovery reports discoveryreports11inst 1935 1936 fig 180 fig 181 the phytoplankton concentration increases so that is caused to migrate during the day into layer it will now follow the path a3 a5 a6 to now let us suppose there is further increase in the phytoplankton making the organism migrate into the layer so that it now follows the path ag as a9 if now we consider the same set of con ditions but consider three organisms spaced out at and in fig 181 in three days time they will be at a3 bz and ca an t1jecp View Photo