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      Speleothem growth intervals reflect New Zealand montane vegetation response to temperature change over the last glacial cycle

      Hellstrom, John C.; Sniderman, Kale; Drysdale, Russell; Couchoud, Isabelle; Hartland, Adam; Pearson, Andrew; Bajo, Petra
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      31_Hellstrom_et_al_Sci_Rep_2020.pdf
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      DOI
       10.1038/s41598-020-58317-8
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      Hellstrom, J. C., Sniderman, K., Drysdale, R., Couchoud, I., Hartland, A., Pearson, A., & Bajo, P. (2020). Speleothem growth intervals reflect New Zealand montane vegetation response to temperature change over the last glacial cycle. Scientific Reports, 10(1). https://doi.org/10.1038/s41598-020-58317-8
      Permanent Research Commons link: https://hdl.handle.net/10289/13434
      Abstract
      Flowstone speleothem growth beneath Mount Arthur, New Zealand shows a clear relationship to vegetation density and soil development on the surface above. Flowstone does not currently form beneath sub-alpine Nothofagus forest above ca. 1000–1100 m altitude but U-Th dating shows it has formed there during past intervals of warmer-than-present conditions including an early–mid Holocene optimum and the last interglacial from ca. 131–119 ka. Some flowstones growing beneath ca. 600 m surface altitude, currently mantled with dense broadleaf-podocarp forest, grew during full glacial conditions, indicating that local tree line was never below this altitude. This implies that Last Glacial Maximum annual temperature was no more than ca. 4 °C cooler than today. Flowstone growth appears to be a robust indicator of dense surface vegetation and well-developed soil cover in this setting, and indicates that past interglacial climates of MIS 7e, 5e, the early–mid Holocene and possibly MIS 5a were more conducive to growth of trees than was the late Holocene, reflecting regional temperature changes similar in timing to Antarctic temperature changes. Here, flowstone speleothem growth is a sensitive indicator of vegetation density at high altitude, but may respond to other factors at lower altitudes.
      Date
      2020
      Type
      Journal Article
      Publisher
      Springer Science and Business Media LLC
      Rights
      This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Te images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

      © Te Author(s) 2020
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