The Spatial And Temporal Distribution Of Picophytoplankton In Jiaozhou Bay

Picophytoplankton (varying from 0.22to0.3μm) including prokaryotes and picoeukaryotes are widely distributed in the oceans all over the world .They are important portions of plankton an play an crucial role in the maintaining of stablilty of ecosystem in the ocean and the carbon flow an energy flow.Studying of the abundance and diversity of picophytopla- nkton in different locations and environment will help in the understanding of the rules of the distribution and the ecological status of picophytoplankton.And the knowledge if abundance and diversity of picophytoplankton will help us to make a solid foundation tof marine environment and learn about the impact of human activities on biological diversity .Jiaozhou bay is a semi-enclosed sea in Qingdao city ,connected with the Yellow Sea, brought together a number of rivers here. Due to the special geographical environment ,it's a typical maritime space in chinese territorial waters . By using flow cytometry,we studied the abundance of picophytoplankton in this area. And it turns out, Synechococcus and Picoeukaryotes both had rich quantities,while Prochlorococcus was not detected . In the four seasons , the abundance of Synechococcus was about 1.317×103 particles mL^-1 5.326×104 particles mL^-1,the maximum value showed in summer and located in the far-shore waters of the Bay; the abundance of Synechococcus living on the surface was always higher than those in the bottom, and there was obvious difference in vertical distribution; The abundance of Synechococcus fluctuated in nycthemeron , in different layers they changes in the same frequency, two peaks showed in noon and night respectively.The quantity of Picoeukaryotes ranged from 1.028×103 particles mL^-1to 3.651×104 particles mL^-1, in spring the number jumped to its highest,and we also found the Picoeukaryotes were mainly active in the coastal waters; In four seasons there was no significant difference between the abundances of Picoeukaryotes living on surface and in bottom;The abundance of Picoeukaryotes over day and night also varied distinctly .The distribution of Picophytoplankton in Jizaozhou Bay we got from this experiment is all about the same with that of Picophytoplankton in Qingdao coastal waters, the North Yellow Sea and the ocean on the same latitude,while the population quantity of Picophytoplankton is larger.The main reason is about Jiaozhou Bay located in urban area ,that impact of the human activities change the hyraulic index of the waters.