Evolution of primary producers and productivity across the EdiacaranCambrian transition | |
Lei Xiang (向雷)1,2,3; Shane D. Schoepfer4; Hua Zhang (张华)1,2,3; Chang-qun Cao (曹长群)1,2,3; Shu-zhong Shen (沈树忠)1,2,3 | |
刊名 | Precambrian Research |
2018-08 | |
卷号 | 313页码:68-77 |
关键词 | Kerogen Nitrogen Isotopes Nutrient Limitation Eukaryote Cambrian Explosion |
ISSN号 | 0301-9268 |
DOI | 10.1016/j.precamres.2018.05.023 |
英文摘要 | Nearly all extant animal phyla first appeared during the Ediacaran-Cambrian transition. A revolution in primary producer ecology and marine productivity has been proposed as a bottom-up ecological driver for this rapid diversification of metazoans. However, the control(s) driving the evolution of primary producers and primary productivity around the Ediacaran-Cambrian transition, and their potential relationship to the Cambrian Explosion, are not fully understood. In this study, we measured the nitrogen content and the nitrogen isotopic composition of kerogen in the Piyuancun and Hetang Formations, using samples collected from the Chunye-1 well, on the Lower Yangtze Block in western Zhejiang. Our isotope results suggest that nitrate was the dominant N source fueling primary productivity during deposition of the entire Piyuancun Formation and lower Hetang Formation, with only a minor contribution from N-2 fixation. Quantitative reconstructions of paleoproductivity based on organic carbon and pyrite content and sedimentation rate indicate that productivity either stayed the same or increased during the transition from the Piyuancun Formation to the overlying Hetang Formation. Thus, fixed N availability was not the ultimate factor limiting primary productivity during the Ediacaran-Cambrian transition. Combining our data with published nitrogen isotope records from the Early-Middle Ediacaran to Cambrian Stage 4 suggests that NO3- was the dominant N species fueling phytoplanktonic productivity during the broad Cambrian Explosion interval, from its earliest roots in the Ediacaran through the main episode in Cambrian Stage 3. Eukaryotes lack the ability to fix nitrogen, and preferentially assimilate nitrate. The NO3--dominated euphotic zone from the Early-Middle Ediacaran to Cambrian Stage 3 may have promoted the radiation of relatively large eukaryote phytoplankton, which may have been an important driver of early animal diversification. |
WOS研究方向 | Geology |
语种 | 英语 |
出版者 | ELSEVIER SCIENCE BV |
WOS记录号 | WOS:000436883700005 |
内容类型 | 期刊论文 |
源URL | [http://ir.nigpas.ac.cn/handle/332004/14003] |
专题 | 中国科学院南京地质古生物研究所 南京地质古生物研究所_其他 中国科学院南京地质古生物研究所 |
通讯作者 | Lei Xiang (向雷) |
作者单位 | 1.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Nanjing Inst Geol & Palaeontol, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China; 2.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China; 3.Nanjing Univ, Ctr Res & Educ Biol Evolut & Environm, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China; 4.Western Carolina Univ, Dept Geosci & Nat Resources, 1 Univ Way, Cullowhee, NC 28779 USA |
推荐引用方式 GB/T 7714 | Lei Xiang ,Shane D. Schoepfer,Hua Zhang ,et al. Evolution of primary producers and productivity across the EdiacaranCambrian transition[J]. Precambrian Research,2018,313:68-77. |
APA | Lei Xiang ,Shane D. Schoepfer,Hua Zhang ,Chang-qun Cao ,&Shu-zhong Shen .(2018).Evolution of primary producers and productivity across the EdiacaranCambrian transition.Precambrian Research,313,68-77. |
MLA | Lei Xiang ,et al."Evolution of primary producers and productivity across the EdiacaranCambrian transition".Precambrian Research 313(2018):68-77. |
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