Macrobenthic community composition and it's secondary productivity in the Haizhou Bay

YUAN Jian-mei;ZHANG Hu;BEN Cheng-kai;YU Wen-wen;GAO Ji-xian;LIU Pei-ting;HU Hai-sheng;YANG-Bo;XU Hai-hua;Jiangsu Marine Fisheries Research Institute;Nantong Marine Environmental Monitoring Center of the State Oceanic Administration;

Haizhou Bay;;macrobenthos;;community composition;;secondary productivity

The secondary productivity of macrobenthic is an important component of matter recycle and energy flow in marine ecosystem.There has been extensive studies,but the research in the Haizhou Bay is limited.In order to get a better understanding of the secondary productivity of macrobenthic in the Haizhou Bay,the seasonal data in 2015 were collected.According to macrobenthic biomass and abundance obtained in the Haizhou Bay and using Brey' s empirical formula,we calculated the secondary productivity and P/B ratio.The results showed that the mean secondary productivity of macrobenthos in studied area was 1.50 [g(AFDM)/(m~2·a)~(-1)] and P/B ratio was 0.63.Sampling stations with high macrobenthic biomass and secondary productivity were mainly located in areas where water depth was 18 to 30 meters,while those with water depth in 20 meters were lower.As for seasonal distribution,the highest secondary productivity was in autumn,2.04 [g(AFDM)/(m~2·a)~(-1)],while the lowest value was in summer,1.00 [g(AFDM)/(m~2·a)~(-1)].The highest P/B value 0.76 appeared in winter and the lowest value 0.57 appeared in spring.Compared with other areas,secondary productivity was similar to the offshore of Jiangsu and the radiative sand ridge filed of the South Yellow Sea.