Sedimentary ancient DNA and HBI biomarkers as sea‐ice indicators: A complementary approach in Antarctic fjord environments

IF 5.1 2区地球科学 Q1 LIMNOLOGY Limnology and Oceanography Letters Pub Date : 2024-05-27 DOI:10.1002/lol2.10395

Anna J. Pieńkowski, Witold Szczuciński, Agnieszka Breszka, Maciej Chyleński, Anna Juras, Paulina Romel, Piotr Rozwalak, Artur Trzebny, Mirosława Dabert, Simon T. Belt, Robert Jagodziński, Lukas Smik, Wojciech Włodarski

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Abstract

Reliable high‐resolution, pre‐observational‐period sea‐ice datasets are rare but critical for contextualizing recent sea‐ice declines and future scenarios. We combine sedimentary ancient DNA of the sea‐ice dinoflagellate Polarella glacialis (Pgla‐sedaDNA) with selected highly branched isoprenoid (HBI) biomarkers alongside other indicators to reconstruct sub‐decadal sea‐ice changes in a marine archive from the Antarctic Peninsula that extends to ~ 1900 CE. Pre‐1940 CE, the continuously present sea‐ice biomarker IPSO25 yet absent Pgla‐sedaDNA, along with low open‐water biomarkers and total organic carbon (TOC), imply more prominent seasonal sea ice and lower productivity under cooler climate. Post‐1940 CE, rising Pgla‐sedaDNA and open‐water HBIs under climate warming reflect young ice with a retreating sea‐ice edge. Over the last two decades, lower Pgla‐sedaDNA, higher open‐water HBIs and TOC infer known warming, sea‐ice reduction, and increased productivity. Our multiproxy‐based palaeo‐histories agree well with observational data, highlighting the potential of this combination of proxies for nuanced and long‐term sea‐ice reconstructions.

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沉积古DNA和HBI生物标记作为海冰指标：南极峡湾环境中的互补方法

可靠的高分辨率、前观测期海冰数据集非常罕见，但对于了解近期海冰衰退的背景和未来情景至关重要。我们将海冰甲藻 Polarella glacialis（Pgla-selaDNA）的沉积古 DNA 与所选的高支链异戊烯类化合物（HBI）生物标志物以及其他指标结合起来，重建了南极半岛海洋档案中延续至公元约 1900 年的十年以下海冰变化。公元前1940年，海冰生物标志物IPSO25持续存在，但没有Pgla-sedaDNA，同时开阔水域生物标志物和总有机碳（TOC）含量较低，这意味着在较冷的气候条件下，季节性海冰更为突出，生产力较低。公元 1940 年后，气候变暖导致 Pgla-sedaDNA 和开放水域 HBI 上升，这反映了海冰边缘正在后退的年轻冰层。在过去 20 年中，Pgla-sedaDNA 值降低、开放水域 HBIs 值和总有机碳值升高，推断出已知的气候变暖、海冰减少和生产力提高。我们基于多重代用指标的古史与观测数据非常吻合，这凸显了这种代用指标组合在细微和长期海冰重建方面的潜力。

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来源期刊

Limnology and Oceanography Letters Multiple-

CiteScore

10.00

自引率

3.80%

发文量

审稿时长

25 weeks

期刊介绍： Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.