Studies On The Character Of Community Structure And Temporal & Spatial Of Zooplankton In Xiangshan Bay

XiangShan Bay is one of the most important bays in Zhejiang Province. Nowadays, the rapid development of sea farming and the establishment of large power plants brings harmfulness to ecological environment and aquaculture. In order to verify the negative impacts caused by human activities on marine ecological system of XiangShan Bay, 13 monitoring stations were established in XiangShan Bay to monitor zooplankton. The thesis studied the character of zooplankton community structure and their spatio-temporal distribution in XiangShan Bay.According to 3 years of continuous monitor result which were carried out from July of 2006 to April of 2009, the XiangShan Bay has abundant zooplankton species and total 132 species of zooplankton (including 28 species of dinospores)were identified, All the species are respectively belong to 18 major classess. Copepods, dinosportes and jellyfish are the main classes in XiangShan Bay, while the other classes is only a small portion. The miniaturization trend of planktonic copepods is obvious, while the kind and density of large and middle size planktonic copepods are obviously lower than the historical data.The zooplankton species in the outside bay are larger than the central and inside.The density and biomass of zooplankton have the same planar distribution pattern, and is higher in the outside and inside bay and lower in the central bay. The oyster culture area in tiegang Bay is the low density area of zooplankton. The variable trend of total individual and biomass is consistent with the water temperature variable trend.The biadiversity index(H′=1.99) and evenness(J=0.54) of zooplankton are low in Xiangshan Bay. Paracalanus aculeatus and Centropages mcmurrichi occupy the dominant position in the community of zooplankton.