globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.05.045
Scopus记录号: 2-s2.0-85048289629
论文题名:
A 43 kyr record of protist communities and their response to oxygen minimum zone variability in the Northeastern Arabian Sea
作者: More K.D.; Orsi W.D.; Galy V.; Giosan L.; He L.; Grice K.; Coolen M.J.L.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 496
起始页码: 248
结束页码: 256
语种: 英语
英文关键词: glacial–interglacial cycle ; Northeast Arabian Sea ; oxygen minimum zone ; paleogenomics ; protist ecology ; sedimentary ancient DNA
Scopus关键词: Eutrophication ; Glacial geology ; Ocean habitats ; Oxygen ; River pollution ; Sedimentology ; Ancient dnas ; Arabian sea ; Interglacial cycles ; Oxygen minimum zone ; paleogenomics ; Climate change ; climate variation ; community response ; DNA ; food web ; fossil record ; genomics ; glacial-interglacial cycle ; oxygen minimum layer ; paleoclimate ; paleoecology ; protist ; taxonomy ; Arabian Sea ; Indian Ocean ; Apicomplexa ; Bacillariophyta ; Colpodea ; Dinophyceae ; Foraminifera ; Protista ; Radiolaria (protozoans)
英文摘要: An extensive oxygen minimum zone (OMZ) occurs in the northeastern (NE) Arabian Sea where sedimentary records show evidence of alternating strong and weak OMZs that correlate with North Atlantic climate variability during the last glacial–interglacial cycle. OMZs are expanding world-wide, but information on long-term OMZ-ecosystem interactions is mainly limited to fossilized species, notably foraminifera. Here, we provide a first comprehensive ancient sedimentary DNA record of both fossilizing and non-fossilizing protists and their response to OMZ variability in the NE Arabian Sea over the last 43 ka. Protist communities changed significantly during strong vs. weak OMZ conditions coincident with interstadials and stadials respectively. Dinoflagellates were identified as significant indicator taxa for strong OMZs during glacial as well as interglacial interstadials, whereas diatoms were significant indicators for strong OMZs only during glacial interstadials. The chlorophyte Chlorella was found to be the main phototrophic protist in nutrient-depleted surface waters during glacial stadials. Notably, strong OMZ conditions shaped past protist communities by creating isolated habitats for those capable of sustaining oxygen depletion either by adapting a parasitic life cycle (e.g. apicomplexans) or by establishing mutualistic connections with others (e.g. radiolarians and mixotrophic dinoflagellates) or by forming cysts (e.g. colpodeans). Notably, a long-term increase in eutrophication and a decrease in the diatom/dinoflagellate ratio was observed during the late Holocene favoring the pelagic component of the marine food web. A similar scenario could be expected in the context of predicted worldwide expansion of coastal OMZs associated with global climate change. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109809
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Department of Agriculture and Environment, School of Molecular and Life Sciences (MLS), Curtin University, Bentley, WA 6102, Australia; Western Australia Organic and Isotope Geochemistry Centre (WAOIGC), The Institute for Geoscience Research (TIGeR), School of Earth and Planetary Sciences (EPS), Curtin University, Bentley, WA 6102, Australia; Department of Earth and Environmental Sciences, Paleontology & Geobiology, Ludwig-Maximilians-Universität München, Munich, 80333, Germany; GeoBio-Center LMU, Ludwig-Maximilians-Universität München, Munich, 80333, Germany; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China

Recommended Citation:
More K.D.,Orsi W.D.,Galy V.,et al. A 43 kyr record of protist communities and their response to oxygen minimum zone variability in the Northeastern Arabian Sea[J]. Earth and Planetary Science Letters,2018-01-01,496
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