Distributional characteristics of planktonic Amphipoda (Hyperiidea) in the South Huanghai Sea and East China Sea

In this paper the distributional characteristics of species composition, ecological nature and specific number of planktonic Amphipoda (Hyperiidea) in the South Huanghai Sea and East China See are analyzed and their relation with the environmental factors is also discussed.It is shown from the results that 71 species of planktonic Amphipoda (Hyperiidea) have been recorded, and the horizontal distribution of species number presents higher in the south and east, lower in the south and west but the highest is in the southeast part of the study area.The higher abundance zone occurred in the northern margin of the study area end in the southeastern waters off the Changjiang Estuary respectively with evident difference in the two zones in composition of species number and ecological nature.The uniyue species parathemisto gandichaudi or Hyppriades silnbaginis was the dominant species distributed in the north and in the south of the Changjieng Estuary respectively.The distribution of plenktonic Amphipoda was rnntrolled by the movement of many distinct water systems within the study area and their reciprocal displacement, The distribution of Amphipoda (Hyperiidee) of different ecological characters showed evidence of the dynamics of the various avatar systems.