Holocene ecosystem and temperature development inferred from invertebrate remains in Zminje Jezero (Dinaric Alps, Montenegro)

IF 1.7 3区 地球科学 Q4 ENVIRONMENTAL SCIENCES
Noé R. M. M. Schmidhauser, Walter Finsinger, Eleonora Cagliero, Oliver Heiri
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引用次数: 0

Abstract

Lake Zminje Jezero (1535 m a.s.l.) in Montenegro was studied for chironomid and other aquatic invertebrate remains in a sediment sequence dating back to 12,000 calibrated 14C years before present (cal yr BP), providing, to our knowledge, the first lake-sediment record studied for chironomids and other associated chitinous aquatic invertebrate remains in the Dinaric Alps. Changes in chironomid and other invertebrate remains along the record make it possible to constrain changes of relevant environmental variables for aquatic invertebrates in the lake including temperature, oxygen availability, trophic status and water depth. The results suggest moderate changes in trophic conditions with chironomid assemblages indicating meso- to eutrophic conditions during the analysed interval. Invertebrate assemblages were typical for lakes with relatively high oxygen availability with a minor trend during the middle to late Holocene to conditions observed in lakes that are more hypoxic. A change in temperature is suggested in the earlier part of the record when the share of chironomid taxa adapted to warmer conditions increased, at the Younger Dryas to Holocene transition, whereas later no particularly pronounced shifts in temperature-sensitive taxa were observed. July air temperatures were estimated based on chironomid assemblages using a transfer function based on calibration data consisting of 117 lakes sampled in the Swiss Alps and northern Switzerland. The results suggest that temperatures rapidly increased by 5 °C at the onset of the Holocene (11,500 cal yr BP) leading to a relatively warm early to mid-Holocene and thereafter slightly decreased during the late Holocene. Reconstructed temperatures are discussed together with a previously published pollen record for our study site and are broadly consistent with other chironomid-based temperature reconstructions from Central, Eastern and Southern Europe. From ca. 3000 cal yr BP sedimentation rates increased and from ca. 500 cal yr BP onwards pollen data suggest that the vegetation and lake catchment were affected by human activities, possibly influencing chironomid and other invertebrate assemblages in the lake and thereby also reconstructed temperatures. Overall, our results show that combining analyses of chironomid and other invertebrate assemblages can provide valuable insights into long-term environmental changes and can provide temperature reconstructions for small mountain lakes in the Balkans, such as Zminje Jezero.

Abstract Image

从 Zminje Jezero(黑山迪纳拉阿尔卑斯山)的无脊椎动物遗骸推断全新世生态系统和气温的发展
研究人员对黑山 Zminje Jezero 湖(海拔 1535 米)沉积物序列中的摇蚊和其他水生无脊椎动物遗骸进行了研究,该沉积物序列的年代可追溯到距今 12,000 经校准的 14C 年前(卡年 BP),据我们所知,这是在第纳尔阿尔卑斯山地区首次对摇蚊和其他相关壳质水生无脊椎动物遗骸进行湖泊沉积物记录研究。通过记录沿线摇蚊和其他无脊椎动物遗骸的变化,可以确定湖泊中水生无脊椎动物的相关环境变量的变化,包括温度、氧气供应、营养状态和水深。结果表明,在所分析的时间段内,营养条件发生了适度变化,摇蚊群显示出中营养到富营养化的条件。无脊椎动物群是典型的含氧量相对较高的湖泊,在全新世中期至晚期有向缺氧程度较高的湖泊条件转变的轻微趋势。在记录的早期阶段,温度发生了变化,适应较暖条件的摇蚊类群的比例增加,即在小干冰期到全新世的过渡阶段,而在晚期则没有观察到对温度敏感的类群发生特别明显的变化。根据对瑞士阿尔卑斯山和瑞士北部 117 个湖泊取样的校准数据,利用传递函数对摇蚊群进行了七月气温的估算。结果表明,在全新世(公元前 11500 年)开始时,气温迅速上升了 5 °C,导致全新世早期至中期相对温暖,此后在全新世晚期气温略有下降。我们将重建的温度与之前发表的研究地点的花粉记录进行了讨论,重建的温度与中欧、东欧和南欧的其他基于摇蚊的温度重建结果基本一致。从约公元前 3000 年开始,沉积速率加快;从约公元前 500 年开始,花粉数据表明植被和湖泊集水区受到人类活动的影响,这可能会影响湖泊中摇蚊和其他无脊椎动物的组合,从而影响重建的温度。总之,我们的研究结果表明,将摇蚊和其他无脊椎动物的组合分析结合起来,可以为长期环境变化提供有价值的见解,并为巴尔干地区的小山湖泊(如 Zminje Jezero)提供温度重建数据。
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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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