TEMPORAL AND SPATIAL CHANGES OF MACROBENTHOS IN MARINE PASTURE DEMONSTRATION AREA IN XIANGSHAN BAY
CHEN Chen;JIAO Hai-Feng;WANG Yi-Nong;LIU Dong;SUN Yuan;LIU Xun;WANG Li;CHEN Qi-Peng;School of Marine Science, Ningbo University;Ningbo Academy of Oceanology and Fisheries;
To evaluate the impacts of marine pasture construction in Xiangshan Bay(Zhejiang, East China) on temporal and spatial changes in macrobenthos, we conducted five bimonthly cruises before(2011), during(2012), and after the construction(2013) in 11 stations in a demonstration area. The temporal and spatial changes were compared in the demonstration area, the adjacent area, and the entire bay. Totally, 59 taxa were identified. The number and density of species were in the order of pre- during- post-construction with remarkable change of dominant species, while that of biomass was during- post- pre-construction. The Shannon-Wiener diversity index and Margalef richness index were in order of pre- post- during-construction, and Pielou evenness index showed an order of during- post- pre-construction. Results of ANOVE show that the density, number of species, and diversity index of macrobenthos were significantly different before and after the construction, so was the cluster, as confirmed also in n MDS(non-metric multidimensional scaling) and global validation by two-way crossed ANOSIM(Analysis of Similarity). The average similarity was ranked as pre- post- during-construction. In addition, the ABC(abundance-biomass comparison) method indicates that the macrobenthic communities presented some disturbance during the construction which could be resulted from human activities, such as artificial fish reef deployment, large seaweed transplanting, and fish fries release for proliferation. The disturbance has disappeared after the construction over a period, and a new artificial ecosystem around fish reef group has been established gradually.