globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.14143
Scopus记录号: 2-s2.0-85045377508
论文题名:
Testate amoeba records indicate regional 20th-century lowering of water tables in ombrotrophic peatlands in central-northern Alberta, Canada
作者: van Bellen S.; Magnan G.; Davies L.; Froese D.; Mullan-Boudreau G.; Zaccone C.; Garneau M.; Shotyk W.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期:7
起始页码: 2758
结束页码: 2774
语种: 英语
英文关键词: functional trait ; Little Ice Age ; oil sands ; peat bog ; permafrost ; Sphagnum ; transfer function ; water table
Scopus关键词: Little Ice Age ; oil sand ; ombrotrophic environment ; peatland ; permafrost ; transfer function ; water table ; Alberta ; Canada ; Sphagnum ; White tip die-back phytoplasma
英文摘要: Testate amoebae are abundant in the surface layers of northern peatlands. Analysis of their fossilized shell (test) assemblages allows for reconstructions of local water-table depths (WTD). We have reconstructed WTD dynamics for five peat cores from peatlands ranging in distance from the Athabasca bituminous sands (ABS) region in western Canada. Amoeba assemblages were combined with plant macrofossil records, acid-insoluble ash (AIA) fluxes and instrumental climate data to identify drivers for environmental change. Two functional traits of testate amoebae, mixotrophy and the tendency to integrate xenogenic mineral matter in test construction, were quantified to infer possible effects of AIA flux on testate amoeba presence. Age–depth models showed the cores each covered at least the last ~315 years, with some spanning the last millennium. Testate amoeba assemblages were likely affected by permafrost development in two of the peatlands, yet the most important shift in assemblages was detected after 1960 CE. This shift represents a significant apparent lowering of water tables in four out of five cores, with a mean drop of ~15 cm. Over the last 50 years, assemblages shifted towards more xerophilous taxa, a trend which was best explained by increasing Sphagnum s. Acutifolia and, to a lesser extent, mean summer temperature. This trend was most evident in the two cores from the sites located farthest away from the ABS region. AIA flux variations did not show a clear effect on mineral-agglutinating taxa, nor on S. s. Acutifolia presence. We therefore suggest the drying trend was forced by the establishment of S. s. Acutifolia, driven by enhanced productivity following regional warming. Such recent apparent drying of peatlands, which may only be reconstructed by appropriate indicators combined with high chronological control, may affect vulnerability to future burning and promote emissions of CO2. © 2018 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110336
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 Renewable Resources, University of Alberta, Edmonton, Canada; Geotop-Université du Québec à Montréal, Montreal, Canada; Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Canada; Department of the Sciences of Agriculture, Food and Environment, University of Foggia, Foggia, Italy; Département de Géographie, Université du Québec à Montréal, Montreal, Canada

Recommended Citation:
van Bellen S.,Magnan G.,Davies L.,et al. Testate amoeba records indicate regional 20th-century lowering of water tables in ombrotrophic peatlands in central-northern Alberta, Canada[J]. Global Change Biology,2018-01-01,24(7)
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