气候变化领域集成服务门户(CCPortal): Last Glacial Maximum environmental conditions at Andøya; northern Norway; evidence for a northern ice-edge ecological “hotspot”

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DOI	10.1016/j.quascirev.2020.106364
	Last Glacial Maximum environmental conditions at Andøya; northern Norway; evidence for a northern ice-edge ecological “hotspot”
	Alsos I.G.; Sjögren P.; Brown A.G.; Gielly L.; Merkel M.K.F.; Paus A.; Lammers Y.; Edwards M.E.; Alm T.; Leng M.; Goslar T.; Langdon C.T.; Bakke J.; van der Bilt W.G.M.
发表日期	2020
ISSN	0277-3791
卷号	239
英文摘要	Andøya on the NW coast of Norway is a key site for understanding the Last Glacial Maximum (LGM) in northern Europe. Controversy has arisen concerning the local conditions, especially about the timing and extent of local glacial cover, maximum July temperatures and whether pine and/or spruce could have grown there. We reviewed all existing data and add newly analysed ancient sedimentary DNA (sedaDNA), pollen, macrofossils, geochemistry and stable isotopes from three lake sediment cores from Øvre Æråsvatnet. A total of 23 new dates and age-depth modelling suggests the lake has been ice-free since GI2 (<23.4 cal ka BP) and possibly GS3 (<26.7 cal ka BP). Pinus and Picea sedaDNA was found in all three cores but at such low frequencies that it could not be distinguished from background contamination. LGM samples have an exceptionally high organic matter content, with isotopic values indicating that carbon and nitrogen derive from a marine source. Along with finds of bones of the little auk (Alle alle), this indicates that the lake received guano from an adjacent bird colony. SedaDNA, pollen and macrofossil assemblages were dominated by Poaceae, Brassicaceae and Papaver, but scattered occurrence of species currently restricted to the Low Arctic Tundra Zone (July temperature of 8–9 °C) such as Apiaceae (sedaDNA, 8–9 °C), and Alchemilla alpina (macrofossil, 8–9 °C) were also recorded. The review of >14.7 cal ka BP data recorded 94 vascular plant taxa, of which 38% have a northern limit in Shrub Tundra or more southern vegetation zones. This unusual assemblage likely stems from a combination of proximity to ice-free water in summer, geographical isolation linked with stochastic long-distance dispersal events, and the presence of bird-fertilized habitats. The environmental reconstruction based on all records from the area does not preclude local growth of tree species, as the local climate combined with high nutrient input may have led to periodically suitable environmental ‘hotspot’ conditions. © 2020 Elsevier Ltd
英文关键词	Ancient DNA (aDNA); Andøya; Climate variability; Environmental conditions; Glacial survival; Last glacial maximum; Late Weichselian; Micro-refugia; MIS2; Sedimentary DNA (sedDNA)
语种	英语
scopus关键词	Birds; Glacial geology; Isotopes; Lakes; Plants (botany); Stochastic systems; Carbon and nitrogen; Environmental conditions; Environmental reconstruction; Lake sediment cores; Last Glacial Maximum; Local conditions; Long-distance dispersals; Stable isotopes; Ice; environmental conditions; geochemistry; glacier; lacustrine deposit; Last Glacial Maximum; paleoenvironment; sediment core; stable isotope; Andoya; Norway; Vesteralen; Alchemilla alpina; Alle alle; Apiaceae; Aves; Brassicaceae; Papaver; Picea; Poaceae; Tracheophyta
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151442
作者单位	UiT – The Arctic University of Norway, Tromsø Museum, Tromsø, N-9037, Norway; University of Southampton, Geography and Environmental Science, Southampton, SO17 1BJ, United Kingdom; Laboratoire d'Ecologie Alpine (LECA), Université Grenoble Alpes, Cedex 9, Grenoble, C2 40700 38058, France; University of Bergen, Department of Biological Science, Bergen, N-5020, Norway; The Bjerknes Centre for Climate Research, Bergen, Norway; British Geological Survey, Centre for Environmental Geochemistry, Nottingham, NG12 5GG, United Kingdom; Faculty of Physics, Adam Mickiewicz University, Poznan, Poland; University of Bergen, Department of Earth Science, Bergen, N-5020, Norway
推荐引用方式 GB/T 7714	Alsos I.G.,Sjögren P.,Brown A.G.,等. Last Glacial Maximum environmental conditions at Andøya; northern Norway; evidence for a northern ice-edge ecological “hotspot”[J],2020,239.
APA	Alsos I.G..,Sjögren P..,Brown A.G..,Gielly L..,Merkel M.K.F..,...&van der Bilt W.G.M..(2020).Last Glacial Maximum environmental conditions at Andøya; northern Norway; evidence for a northern ice-edge ecological “hotspot”.Quaternary Science Reviews,239.
MLA	Alsos I.G.,et al."Last Glacial Maximum environmental conditions at Andøya; northern Norway; evidence for a northern ice-edge ecological “hotspot”".Quaternary Science Reviews 239(2020).