Diatom-based paleolimnology of Lake Pavin over the past 7000 years

IF 1.7 3区 地球科学 Q4 ENVIRONMENTAL SCIENCES Journal of Paleolimnology Pub Date : 2024-07-24 DOI:10.1007/s10933-024-00330-2
Karen K. Serieyssol, Aude Beauger, Yannick Miras, Léo Chassiot, Victor Arricau, Emmanuel Chapron
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Abstract

Lake Pavin, a maar lake was formed approximately 7000 years ago by a phreatomagmatic explosion, leaving a deep central crater with shallow steep side slopes. PAV12 core, collected from the center of the lake, displayed two diatomite layers, separated by a 4-m thick unit of reworked sediments. Diatom diversity and zonation analyses registered six zones documenting the lake evolution. Asterionella formosa, Pantocsekiella ocellata and Discostella pseudostelligera (including f. diminuta) along with fragilariod taxa composed the basal unit (L-1, ~ 6900 to 6570 cal a BP). With increased mineralization of the lake waters, Stephanodiscus taxa became the major species (L-2, 6190–3800 cal a BP). A transition zone was noted between Zone L-2 and L-3 (3950–3700 BP) and related to a major change in diatom composition. Asterionella formosa and Nitzschia paleacea dominated Zone L-3 (3760–1470 cal a BP) with a large decrease in Stephanodiscus taxa. This major change has been related to soil erosion and the possible development of meromixis. Stephanodiscus parvus and Asterionella formosa dominated the upper diatomite zone L-4 (640–400 cal a BP) while zone L-5 (290–160 cal a BP) is dominated by Aulacoseira subarctica (including f. recta) and may be caused by the Little Ice Age. Zone L-6 (subrecent) saw a return to similar conditions as in zone L-4. The gradual opening of the diversified forest and appearance of regional agriculture appears to be related to the development of meromixis. Changes in the upper diatomite zone are related to agricultural activity, changes in incomplete overturn and climate. This study examines relationships between diatom changes and pollen and geochemical changes observed within the lake.

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过去 7000 年帕文湖的硅藻古气候学
帕文湖(Lake Pavin)是一个玛珥湖,大约形成于 7000 年前的一次喷火岩浆爆炸,留下了一个中央深、两侧浅的陡峭火山口。从湖中心采集的 PAV12 岩芯显示了两个硅藻土层,中间被 4 米厚的再加工沉积物单元隔开。硅藻多样性和分区分析记录了湖泊演变的六个区域。Asterionella formosa、Pantocsekiella ocellata 和 Discostella pseudostelligera(包括 f. diminuta)以及脆性类群组成了基底单元(L-1,约公元前 6900 至公元前 6570 年)。随着湖水矿化度的提高,Stephanodiscus 类群成为主要物种(L-2,6190-3800 卡西一 BP)。在 L-2 区和 L-3 区(3950-3700 BP)之间出现了一个过渡区,与硅藻成分的重大变化有关。L-3 区(公元前 3760-1470 年)以 Asterionella formosa 和 Nitzschia paleacea 为主,Stephanodiscus 类群大量减少。这一重大变化与水土流失和可能出现的经混杂现象有关。L-4 区(公元前 640-400 年)的硅藻土上层主要是 Stephanodiscus parvus 和 Asterionella formosa,而 L-5 区(公元前 290-160 年)的硅藻土上层主要是 Aulacoseira subarctica(包括 f. recta),这可能是小冰河时期造成的。L-6 区(次新近)恢复到了与 L-4 区类似的条件。多样化森林的逐渐开放和区域农业的出现似乎与经混杂现象的发展有关。上硅藻土区的变化与农业活动、不完全翻转的变化和气候有关。本研究探讨了硅藻变化与湖内观察到的花粉和地球化学变化之间的关系。
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来源期刊
Journal of Paleolimnology
Journal of Paleolimnology 地学-地球科学综合
CiteScore
3.70
自引率
9.50%
发文量
44
审稿时长
3 months
期刊介绍: The realization that a historical perspective is often useful, if not essential, to the understanding of most limnological processes has resulted in the recent surge of interest in paleolimnology. The main aim of the Journal of Paleolimnology is the provision of a vehicle for the rapid dissemination of original scientific work dealing with the reconstruction of lake histories. Although the majority of papers deal with lakes, paleoenvironmental studies of river, wetland, peatland and estuary systems are also eligible for publication. The Journal of Paleolimnology, like the subject itself, is multidisciplinary in nature, and papers are published that are concerned with all aspects (e.g. biological, chemical, physical, geological, etc.) of the reconstruction and interpretation of lake histories. Both applied and more theoretical papers are equally encouraged. The Journal of Paleolimnology will continue to be a major repository for papers dealing with climatic change, as well as other pressing topics, such as global environmental change, lake acidification, eutrophication, long-term monitoring, and other aspects of lake ontogeny. Taxonomic and methodological papers are also acceptable provided they are of relatively broad interest. New equipment designs are frequently featured. In addition to original data and ideas, the Journal of Paleolimnology also publishes review articles, commentaries and program announcements. A relevant Book Review Section is also featured.
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