Seasonal and regional diff erences in long-term changes in large mesozooplankton(>505μm)biomass and abundance in a semi-enclosed subtropical bay  

作　　者：Ping DU Zhibing JIANG Yuanli ZHU Yibo LIAO Quanzhen CHEN Jiangning ZENG Lu SHOU 

机构地区：[1]Key Laboratory of Marine Ecosystem Dynamics,Second Institute of Oceanography,Ministry of Natural Resources(MNR),Hangzhou 310012,China [2]Laboratory for Marine Fisheries Science and Food Production Processes,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China [3]Key Laboratory of Ocean Space Resource Management Technology,MNR,Hangzhou 310012,China

出　　处：《Journal of Oceanology and Limnology》2021年第6期2281-2294,共14页海洋湖沼学报（英文）

基　　金：Supported by the National Key Research and Development Program of China(Nos.2018YFD0900901,2018YFD0900905);the Long Term Observation and Research Plan in the Changjiang River estuary and the Adjacent East China Sea Project(LORCE)(No.14282);the National Natural Science Foundation of China(Nos.41806149,41806181,41706125);the NSFC-Zhejiang Joint Fund,China(No.U1709202)。

摘　　要：Obvious spatiotemporal heterogeneity is a distinct characteristic of ecosystems in subtropical bays.To aid targeted management and ecological restoration in long and narrow semi-enclosed subtropical bays,we analyzed seasonal and regional differences in long-term changes(1980-2019)in the biomass and abundance of large mesozooplankton(LMZ;>505μm)in Xiangshan Bay,Zhejiang,China.We found spatiotemporal heterogeneity in the historical changes of LMZ.Significant negative trends in LMZ biomass were found in the inner and middle bay during the warm season(summer and autumn),when the nutrient concentration(especially dissolved inorganic nitrogen)and temperature increased simultaneously.Nutrient changes in Xiangshan Bay began in the late 1980s or early 1990s,coinciding with large-scale fish cage development.A rapid decline in LMZ biomass occurred after 2005 when power plants commenced operation,accelerating the warming trend.Therefore,the joint stress of eutrophication and warming likely precipitated the decline in LMZ biomass.Conversely,a significant increase in LMZ biomass was found in the outer bay in spring.This trend was consistent with the trend of LMZ biomass near the Changjiang(Yangtze)River estuary,which indicates that the pelagic ecosystem in the outer bay was aff ected by water from the Changjiang River estuary during spring.Based on our results,ecosystem management and restoration in semi-enclosed subtropical bays should focus on internal waters,which have a poor capacity for water exchange.For Xiangshan Bay,the changes in the Changjiang River estuary ecosystem during the cold season(winter and spring)should also be considered.

关 键 词：large mesozooplankton long-term changes spatiotemporal heterogeneity Xiangshan Bay 

分 类 号：Q958.8[生物学—动物学]