Biocalcification crisis in the continental shelf under ocean acidification  

作　　者：Shuaishuai Dong Yanli Lei Tiegang Li Yifei Cao Kuidong Xu 

机构地区：[1]Laboratory of Marine Organism Taxonomy and Phylogeny,Qingdao Key Laboratory of Marine Biodiversity and Conservation,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China [2]Key Laboratory of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,MNR,Qingdao 266061,China [3]Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China [4]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Geoscience Frontiers》2023年第6期1-7,共7页地学前缘（英文版）

基　　金：supports from the following projects:the National Natural Science Foundation of China(Nos.41976058,U1906211);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB42000000);Natural Science Foundation of Shandong Province(Grant No.ZR2021QD004)。

摘　　要：Ocean acidification(OA)is a persistent challenge for humans and is predicted to have deleterious effects on marine organisms,especially marine calcifiers such as coral and foraminifera.Benthic foraminifera is an important component of sediment in the continental shelf,while little is known about the impact of ocean acidification on benthic foraminifera both at the community and individual level and associated calcium carbonate deposition.We conducted eight months continued culture experiment under the scenario of 400,800,1200 and 1600 ppm pCO_(2)gradients on living benthic foraminifera from four stations in the continental shelf of the West Pacific Ocean.Statistic results showed OA had a negative effect on the abundance of benthic foraminifera.In contrast,the diversity increased roughly under OA conditions implying OA might stimulate the emergence of rare species and promote community diversity to some extent.In addition,we confirmed that the offshore area wasn’t the refuge for benthic foraminifera while the nearshore one had more resistance to moderate acidification.Calcareous species Protelphidium tuberculatum was the dominant species occupying on average 75%in all treatments and its shell diameter,weight and thickness showed a decrease,indicating the decrease of calcification of benthic foraminifera.A relationship between the weight of P.tuberculatum and pCO_(2)(R^(2)=0.96)was established.Based on the present work,calcareous benthic foraminifera deposited 8.57104 t calcium carbonate per year and this might reduce by nearly half and 90%under 800 and 1200 ppm scenarios,which indicates a biocalcification crisis under ongoing OA.This work shows an analogy for palaeoceanic OA and also provides new insights into the sediment of calcium carbonate in the future.

关 键 词：Benthic foraminifera pCO_(2) Ocean acidification Continental shelf Calcium carbonate deposit Yellow Sea 

分 类 号：P542[天文地球—构造地质学]