气候变化领域集成服务门户(CCPortal): Changes in productivity associated with algal-microbial shifts during the Early Triassic recovery of marine ecosystems

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DOI	10.1130/B35510.1
	Changes in productivity associated with algal-microbial shifts during the Early Triassic recovery of marine ecosystems
	Du Y.; Song H.; Tong J.; Algeo T.J.; Li Z.; Song H.; Huang J.
发表日期	2020
ISSN	167606
起始页码	362
结束页码	378
卷号	133 期号:2021-01-02
英文摘要	The recovery of marine ecosystems in the aftermath of the Permian-Triassic mass extinction was accompanied by signifcant carbon-cycle perturbations, as refected in large-amplitude global excursions in Lower Triassic carbonate carbon isotope records. In the present study, we generated paired carbonate carbon (δ13Ccarb), organic carbon (δ13Corg), and nitrogen (δ15N) isotope records along with molar C/N ratios for a composite section in the Chaohu area of Anhui Province (northern Yangtze Platform, South China) that spans the entire Lower Triassic. These records document concurrent changes among multiple proxies related to marine plankton community composition, productivity rates, and nutricline structure, providing unparalleled insights into changes at the base of the marine trophic web during the Early Triassic recovery interval. Changes in carbonate-organic carbon iso-topic differences (Δ13Ccarb-org) and C/N ratios indicate a general shift from anoxygenic pho-toautotrophy to eukaryotic algal productivity during the Early Triassic. The prevalence of prokaryotic photoautotrophs in the Griesba-chian to Smithian was due to frequent environmental disturbance, whereas the reestablishment of eukaryotic algae as dominant primary producers in the Spathian refects a general amelioration of marine environments at that time. Positive δ13Ccarb excursions and brief spikes toward higher Δ13Ccarb-org and C/N ratios around the Induan-Olenekian boundary and Smithian-Spathian boundary record transient shifts toward improved conditions and temporary rebounds of algal productivity. A negative δ15N shift was associated with decreasing δ13Ccarb, indicating that marine productivity was closely linked to N-fxation intensity owing to a general nutrient-N defciency. Synchronous fuctua-tions of δ13Ccarb and δ13Corg through the Ole-nekian refect changes in the δ13C of oceanic dissolved inorganic carbon, but the more limited variation in δ13Corg may have been due to concurrent changes in algal-microbial assemblages and, thus, net photosynthetic fractionation of carbon isotopes. © 2020 Geological Society of America
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184832
作者单位	State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences,, Wuhan, 430074, China; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China; Department of Geology, University of Cincinnati, Ohio, Cincinnati, 452210013, United States; Anhui Geological Museum, Hefei, 230031, China
推荐引用方式 GB/T 7714	Du Y.,Song H.,Tong J.,et al. Changes in productivity associated with algal-microbial shifts during the Early Triassic recovery of marine ecosystems[J],2020,133(2021-01-02).
APA	Du Y..,Song H..,Tong J..,Algeo T.J..,Li Z..,...&Huang J..(2020).Changes in productivity associated with algal-microbial shifts during the Early Triassic recovery of marine ecosystems.Bulletin of the Geological Society of America,133(2021-01-02).
MLA	Du Y.,et al."Changes in productivity associated with algal-microbial shifts during the Early Triassic recovery of marine ecosystems".Bulletin of the Geological Society of America 133.2021-01-02(2020).