STUDY ON BACILLARIOPHYCEAE PHYLUM CHANGES IN SOUTHERN CASPIAN SEA

In this study for maturing of Bacillariophyceae species, choose 6 line Lisar, Anzaly, Sefidrood, Nooshahr, Babolsar and Amirabad that every line have 4 stations(A, B, C, D) and water for analysis have taken from different deeps (0,5,10,20,50,100) meter in southern of Caspian sea and then transferred to laboratory of Caspian sea ecological institute. Then the samples transferred to laboratory of Ecological Academy, kept in cool and darkness in properly capped glass bottles. The phytoplankton was analyzed on a “Nikon” light microscope at ×480 magnification. Algae abundance was determined using the Hydro bios counting chamber and sampled (volume 0.1 ml). In this study, during 1995-1996 the overall average cell abundance and biomass of Bacillariophyceae in different seasons were significant different. The dominant cell abundance was recorded in winter (79%). During 2006-2007, cell abundance of Bacillariophyceae increased but Pyrrophyta show decrease of cell abundance. Since major changes in an ecosystem can affect all the tropic levels in the food chain, any ecological and environmental alteration can have a significant impact on Bacillariophyceae species specially the large-sized Bacillariophyceae community in the Caspian Sea.