Subfossil Cladocera from surface sediment in thermokarst lakes in northeastern Siberia, Russia, in relation to limnological and climatic variables
Subfossil Cladocera from surface sediment in thermokarst lakes in northeastern Siberia, Russia, in relation to limnological and climatic variables
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DOI：
10.1007/s10933-014-9781-7
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发表时间：
2014-06
影响因子：
2.1
通讯作者：
L. Frolova;L. Nazarova;L. Pestryakova;U. Herzschuh
中科院分区：
文献类型：
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作者：
L. Frolova;L. Nazarova;L. Pestryakova;U. Herzschuh
从西伯利亚东北部雅库特西北部阿纳巴尔河流域35个热喀斯特湖泊沿林线温度梯度的表层沉积物中采集并检测了枝角亚化石。湖泊分布在典型冻土带、南部冻土带和森林冻土带三个环境带中。所有湖泊都位于连续的多年冻土带内。调查结果表明，阿纳巴尔地区湖泊中的枝角类群落多样性和丰富度较高，多样性指数和均匀度指数较高(H_1=0.89±0.51；I_i=10.8±0.18)。CONISS聚类分析表明，3个生态区(典型冻土带、南部冻土带和森林冻土带)的枝角类群落在分类组成和结构上存在差异。枝角类组合的差异与湖沼学特征和地理位置、植被类型、气候和水化学有关。约束冗余度分析表明，温度、水深、硫酸盐(SO42-−)和硅酸盐(Si4+)浓度对枝角类组合的差异有显著的解释作用(p≤)。亚化石枝角类分布的解释变异百分比最高(17.4%)。调查样带枝角类群落结构最显著的变化之一是纬度和植被梯度上密切相关物种的更替。结果表明，俄罗斯北极地区，特别是雅库特和雅库特地区，有可能建立一个基于枝角虫的区域温度模式。
Subfossil Cladocera were sampled and examined from the surface sediments of 35 thermokarst lakes along a temperature gradient crossing the tree line in the Anabar-river basin in northwestern Yakutia, northeastern Siberia. The lakes were distributed through three environmental zones: typical tundra, southern tundra and forest tundra. All lakes were situated within the continuous permafrost zone. Our investigation showed that the cladoceran communities in the lakes of the Anabar region are diverse and abundant, as reflected by taxonomic richness, and high diversity and evenness indices (H = 1.89 ± 0.51; I = 0.8 ± 0.18). CONISS cluster analysis indicated that the cladoceran communities in the three ecological zones (typical tundra, southern tundra and forest-tundra) differed in their taxonomic composition and structure. Differences in the cladoceran assemblages were related to limnological features and geographical position, vegetation type, climate and water chemistry. The constrained redundancy analysis indicated that TJuly, water depth and both sulphate (SO42−) and silica (Si4+) concentrations significantly (p≤ 0.05) explained variance in the cladoceran assemblage. TJulyfeatured the highest percentage (17.4 %) of explained variance in the distribution of subfossil Cladocera. One of the most significant changes in the structure of the cladoceran communities in the investigated transect was the replacement of closely related species along the latitudinal and vegetation gradient. The results demonstrate the potential for a regional cladoceran-based temperature model for the Arctic regions of Russia, and for and Yakutia in particular.