Changes in temperature and water depth of a small mountain lake during the past 3000 years in Central Kamchatka reflected by a chironomid record
Changes in temperature and water depth of a small mountain lake during the past 3000 years in Central Kamchatka reflected by a chironomid record
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DOI：
10.1016/j.quaint.2016.10.008
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发表时间：
2017-08-15
影响因子：
2.2
通讯作者：
Diekmann, Bernhard
中科院分区：
文献类型：
--
作者：
Nazarova, Larisa;Bleibtreu, Annette;Diekmann, Bernhard
我们调查了摇蚊组合的一个很好的日期从一个小渗漏湖位于东部斜坡的中央堪察加山脉，远东俄罗斯的沉积物核心。调查Sigrid湖的摇蚊动物区系占主导地位的沿岸的类群是敏感的水位波动。在过去的2800年里，两组分类群交替占主导地位的记录响应湖泊环境的变化。第一组沿岸的嗜植类群包括Psectrocladius sordidellus型、Corynoneura arctica型和Dicrotendipes nervosus型。这一类群的丰度对PCA 1的变化影响最大，且这些类群大多对应于低水位、中等温度和轻度酸化的环境。第二组分类群包括Microtendipes pedellus型、Tanytarsus lugens型和Tanytarsus pallidicornistype。这些类群的丰度变化，特别是M. pedellus型，符合PCA 2，并对应于较高的水位在湖泊中，更贫营养和中性pH值的条件。使用来自东西伯利亚的现代基于摇蚊的温度和水深校准数据集（训练集）和推断模型（Nazarova等人，2011年）。使用基于远东现代校准数据集的基于摇蚊的温度推断模型来推断平均七月气温（TJuly）（Nazarova等人，2015年）。传递函数的应用导致重建T七月波动约3摄氏度在过去的2800年。低温（11.0-12.0摄氏度）被重建为约1700和1500 cal yr BP（对应于古坟冷期）之间的时期，约1200和150 cal yr BP（部分对应于小冰期[LIA]）。温暖的时期（现代T七月或更高）重建约2700和1800卡尔年BP，1500和1300卡尔年BP和150卡尔年BP后的时期。WD重建显示，湖泊水位低于其目前的水平在开始的记录之间约2600和2300卡尔年BP和约550卡尔年BP。在约2300和700 cal yr BP之间以及450和150 cal yr BP之间，湖泊水位高于今天，最可能反映了更潮湿的条件。(C)2016 Elsevier Ltd和INQUA。All rights reserved.
We investigated chironomid assemblages of a well-dated sediment core from a small seepage lake situated at the eastern slope of the Central Kamchatka Mountain Chain, Far East Russia. The chironomid fauna of the investigated Sigrid Lake is dominated by littoral taxa that are sensitive to fluctuations of the water level. Two groups of taxa interchangeably dominate the record responding to the changes in the lake environment during the past 2800 years. The first group of littoral phytophilic taxa includes Psectrocladius sordidellus-type, Corynoneura arctica-type and Dicrotendipes nervosus-type. The abundances of the taxa from this group have the strongest influence on the variations of PCA 1, and these taxa mostly correspond to low water levels, moderate temperatures and slightly acidified conditions. The second group of taxa includes Microtendipes pedellus-type, Tanytarsus lugens-type, and Tanytarsus pallidicornistype. The variations in the abundances of these taxa, and especially of M. pedellus-type, are in accordance with PCA 2 and correspond to the higher water level in the lake, more oligotrophic and neutral pH conditions. Water depths (WD) were reconstructed, using a modern chironomid-based temperature and water depth calibration data set (training set) and inference model from East Siberia (Nazarova et al., 2011). Mean July air temperatures (T July) were inferred using a chironomid-based temperature inference model based on a modern calibration data set for the Far East (Nazarova et al., 2015). The application of transfer functions resulted in reconstructed T July fluctuations of approximately 3 degrees C over the last 2800 years. Low temperatures (11.0-12.0 degrees C) were reconstructed for the periods between ca 1700 and 1500 cal yr BP (corresponding to the Kofun cold stage) and between ca 1200 and 150 cal yr BP (partly corresponding to the Little Ice Age [LIA]). Warm periods (modern T July or higher) were reconstructed for the periods between ca 2700 and 1800 cal yr BP, 1500 and 1300 cal yr BP and after 150 cal yr BP. WD reconstruction revealed that the lake level was lower than its present level at the beginning of the record between ca 2600 and 2300 cal yr BP and ca 550 cal yr BP. Between ca 2300 and 700 cal yr BP as well as between 450 and 150 cal yr BP, the lake level was higher than it is today, most probably reflecting more humid conditions. (C) 2016 Elsevier Ltd and INQUA. All rights reserved.