Scholarlink

<p>Ancient DNA and branched glycerol dialkyl glycerol tetraethers are powerful tools to reconstruct past ecosystems and climate in high-latitude lakes, but often require contrasting redox conditions for reliable interpretations. Here, we present a new approach using adjacent oxic and seasonally suboxic lakes from Iceland to 1) better understand the impacts of redox potential on these molecular proxies, and 2) reconstruct Holocene climate, human settlement, and plant history. We observe that oxic lakes provide more reliable branched glycerol dialkyl glycerol tetraethers-based paleotemperature records, possibly due to the diminished presence of bacterial communities associated with reducing environments. On the other hand, oxic conditions in shallow lakes, which are often targeted for ancient DNA, can lead to poor preservation. By combining oxic and suboxic lake sediment records, we show that natural climate, and not humans, has controlled Holocene vegetation changes in northeast Iceland, and therefore provides ideal constraints for Earth system models.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Both redox potential and climate control molecular proxies in Icelandic Holocene lake sediments

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年9月24日

查看全文
  • David J. Harning,
  • Samuel Sacco,
  • Jonathan H. Raberg,
  • Nicolò Ardenghi,
  • Julio Sepúlveda,
  • Beth Shapiro,
  • Gifford H. Miller,
  • Áslaug Geirsdóttir

摘要

Ancient DNA and branched glycerol dialkyl glycerol tetraethers are powerful tools to reconstruct past ecosystems and climate in high-latitude lakes, but often require contrasting redox conditions for reliable interpretations. Here, we present a new approach using adjacent oxic and seasonally suboxic lakes from Iceland to 1) better understand the impacts of redox potential on these molecular proxies, and 2) reconstruct Holocene climate, human settlement, and plant history. We observe that oxic lakes provide more reliable branched glycerol dialkyl glycerol tetraethers-based paleotemperature records, possibly due to the diminished presence of bacterial communities associated with reducing environments. On the other hand, oxic conditions in shallow lakes, which are often targeted for ancient DNA, can lead to poor preservation. By combining oxic and suboxic lake sediment records, we show that natural climate, and not humans, has controlled Holocene vegetation changes in northeast Iceland, and therefore provides ideal constraints for Earth system models.