当前位置: X-MOL 学术Quat. Sci. Rev. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Last Glacial Maximum environmental conditions at Andøya, northern Norway; evidence for a northern ice-edge ecological “hotspot”
Quaternary Science Reviews ( IF 4 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.quascirev.2020.106364
Inger G. Alsos , Per Sjögren , Antony G. Brown , Ludovic Gielly , Marie Kristine Føreid Merkel , Aage Paus , Youri Lammers , Mary E. Edwards , Torbjørn Alm , Melanie Leng , Tomasz Goslar , Catherine T. Langdon , Jostein Bakke , Willem G.M. van der Bilt

Abstract Andoya 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 Ovre AErasvatnet. A total of 23 new dates and age-depth modelling suggests the lake has been ice-free since GI2 ( 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.

中文翻译:

挪威北部 Andøya 的末次冰川盛期环境条件;北部冰缘生态“热点”的证据

摘要 挪威西北海岸的安多亚是了解北欧末次盛冰期 (LGM) 的关键地点。关于当地条件的争议已经出现,特别是关于当地冰川覆盖的时间和范围、7 月的最高气温以及松树和/或云杉是否可以在那里生长。我们审查了所有现有数据,并添加了来自 Ovre AErasvatnet 的三个湖泊沉积物核心的新分析的古代沉积 DNA (sedaDNA)、花粉、大型化石、地球化学和稳定同位素。共有 23 个新日期和年龄深度模型表明该湖自 GI2 以来一直没有冰(14.7 cal ka BP 数据记录了 94 种维管植物分类群,其中 38% 在灌木苔原或更南部的植被区具有北部界限。这种不寻常的组合可能源于夏季接近无冰水的组合,地理隔离与随机长距离传播事件以及鸟类受精栖息地的存在有关。根据该地区的所有记录进行的环境重建并不排除当地树种的生长,因为当地气候与高营养输入相结合可能会导致周期性合适的环境“热点”条件。
更新日期:2020-07-01
down
wechat
bug