According to the tide table the protozoan communities were collected with PFU method at two stations in Pearl River

Guangzhou City. The samples which were collected in different tide periods respectively were observed qualitatively and quantitavely. After the data analysis and statistical comparision we find that the clonization and the functional parameters of protozoan communities are not influenced by tides in Pearl River

so that PFU Method is also suitable to be used on the water body with tides.