气候变化领域集成服务门户(CCPortal): Neritic ecosystem response to Oceanic Anoxic Event 2 in the Cretaceous Western Interior Seaway; USA

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DOI	10.1016/j.palaeo.2020.109673
	Neritic ecosystem response to Oceanic Anoxic Event 2 in the Cretaceous Western Interior Seaway; USA
	Boudinot F.G.; Dildar N.; Leckie R.M.; Parker A.; Jones M.M.; Sageman B.B.; Bralower T.J.; Sepúlveda J.
发表日期	2020
ISSN	0031-0182
卷号	546
英文摘要	Cretaceous oceanic anoxic events (OAEs) were periods of geologically short (<1 million years) global change characterized by elevated temperatures, changes in ocean biogeochemistry, ecological turnover, and the global-scale deposition of black shales. After decades of OAE research, the intensity and spatiotemporal heterogeneity of ocean anoxia and its direct effects on marine ecology remain areas of active study. We present high-resolution organic geochemical and foraminiferal records from the western margin of the Western Interior Seaway (WIS) during the Cenomanian-Turonian Oceanic Anoxic Event 2 (OAE2, ~94 Ma) that indicate reorganization of a neritic ecosystem in response to sea-level rise, and dynamic changes in redox conditions that were likely driven by enhanced marine productivity. A significant transgression prior to OAE2 decreased terrestrial organic matter input and led to enhanced productivity, anoxic bottom waters and sediments, and episodic photic zone euxinia. During the middle of OAE2, further enhanced productivity led to the “Heterohelix shift” in planktic foraminifera, the “Gavelinella acme” in benthic foraminifera, and deoxygenation in sediments, bottom waters, and the upper water column. The combined use of high-temporal resolution algal, bacterial, and terrestrial biomarkers, in addition to foraminiferal records, demonstrates the sensitivity of marine autotrophic and heterotrophic communities to sea-level rise and variable water column oxygenation in marginal marine settings during hyperthermal events. Furthermore, our results reveal the temporal and spatial heterogeneity of anoxia during OAE2 in the WIS. This study highlights widespread shallow marine feedbacks during global change that may affect neritic ecosystems under future warming scenarios. © 2020
英文关键词	Foraminifera; Lipid biomarkers; Marine ecology; Smokey Hollow #1 core; Water column deoxygenation
语种	英语
scopus关键词	anoxic conditions; biomarker; Cretaceous; ecosystem response; foraminifera; global change; lipid; marine ecosystem; photic zone; redox conditions; transgression; water column; United States; Western Interior; algae; Bacteria (microorganisms); Foraminifera; Heterohelix
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150545
作者单位	Department of Geological Sciences, Institute of Arctic and Alpine Research (INSTAAR), University of Colorado Boulder, 450 UCB, Boulder, CO 80309, United States; Department of Geosciences, University of Massachusetts Amherst, 611 North Pleasant Street, Amherst, MA 01003, United States; Department of Earth and Planetary Sciences, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208, United States; Department of Geosciences, Pennsylvania State University, 502 Deike Building, University ParkPA 16802, United States
推荐引用方式 GB/T 7714	Boudinot F.G.,Dildar N.,Leckie R.M.,et al. Neritic ecosystem response to Oceanic Anoxic Event 2 in the Cretaceous Western Interior Seaway; USA[J],2020,546.
APA	Boudinot F.G..,Dildar N..,Leckie R.M..,Parker A..,Jones M.M..,...&Sepúlveda J..(2020).Neritic ecosystem response to Oceanic Anoxic Event 2 in the Cretaceous Western Interior Seaway; USA.Palaeogeography, Palaeoclimatology, Palaeoecology,546.
MLA	Boudinot F.G.,et al."Neritic ecosystem response to Oceanic Anoxic Event 2 in the Cretaceous Western Interior Seaway; USA".Palaeogeography, Palaeoclimatology, Palaeoecology 546(2020).