INVESTIGATION OF PLANKTON AND BENTHOS IN SHENZHEN BAY

In this paper, the species, amounts and distribution situation of phytoplankton, zooplankton and zoobenthos in Shenzhen Bay are studied. The results showed that the freshwater species were predominant, and 45 species of algal (5 phylums, 32 genera), in which 18 species of Bacillariophyta belong to 12 genera, 15 species of Chlorophyta one genus, 10 species of Cyanophyta 7 genera, and one specie of Euglenphyta and Chrysophyta; 37 species of zooplankton, in which 9 species of Protozoa, 14 species of Rotifera, 2 species of Euglenophyta, 8 species of Copepoda, 4 species of zooplankton laevae et al; 20 species of zoobenthos in which 7 species of Ploychaeta in Annolida, 2 species of Oligochaeta, 8 species of Mollusca, 2 species of Crustacea and one specie of fish were found in the bay. The distribution and amount characteristic of plankton and benthos are: the number of algal cells ranged from 2.4 to 14×106 cell/L , average 6.43×106 cell/L; the number of zooplankton cells ranged from 514 to 8 049.2 ind/L, average 1 690.8 ind/L; the number of zoobenthos cells ranged from 180 to 8 860 ind/m2, average 2 364 ind/m2. The amount of these three kinds of organisms are closely related to the distance from the stream outlet of Shenzhen River. The diversity indices differed obviously between inside and outside of the bay, and are at low average level.