Some recent trends regarding Lake Baikal phytoplankton and zooplankton
Some recent trends regarding Lake Baikal phytoplankton and zooplankton
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贝加尔湖浮游植物和浮游动物的一些最新趋势
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
S. Shimaraeva
中科院分区：
文献类型：
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作者：
E. Silow;L. Krashchuk;Konstantin A. Onuchin;Helena V. Pislegina;O. Rusanovskaya;S. Shimaraeva
本研究使用了贝加尔湖1951-2010年的浮游生物采样数据。在南部盆地水深约为800米的一个近海采样点，至少每月收集一次数据，一般每隔7-10天收集一次从表层到250米的深度剖面。该湖最高50米的数据是温度和生物特征的平均，指出这是该湖中展示大部分光合作用生产的水层，也是包含最多浮游生物的水层。浮游动物样本是用一个封闭的浮游生物网收集的，并在物种一级进行计数，也按年龄段进行鉴定。冰下浮游植物显示了春季浮游植物的某些演替，包括特有藻类的比例下降。开放水域的藻类复合体表明，一些非特有物种呈现出积极的趋势。浮游动物分析表明，浮游动物总数有明显增加的趋势，浮游动物的主要成分是黄斑鱼，以及枝角类数量的增加。这些趋势可用下列假设解释：(I)全球气候变化(尽管贝加尔湖也显示出长期的温度振荡)；(Ii)区域变暖(由于1950-1970年代期间修建水库系统)；(Iii)由于湖泊流域和流域的工农业活动增加而造成的当地化学污染；和/或(Iv)湖泊浮游生物组成部分的自然振荡行为。
Plankton sampling data from the period of 1951–2010 for Lake Baikal were used in this study. Data have been collected at least monthly, generally every 7–10 days, in depth profiles from the surface to 250 m at a single offshore sampling site in the southern basin, where the water depth is approximately 800 m. Measurements of abiotic variables and phytoplankton sampling were made at discrete water depths. The data for the top 50 m of the lake were averaged for temperature and biological characteristics, noting this is the water layer in the lake exhibiting most of the lake's photosynthetic production, as well as containing the most plankton organisms. Zooplankton samples were collected with a closing plankton net and enumerated at the species level and also identified by age class. Under-ice phytoplankton demonstrated the presence of some succession in spring phytoplankton, including a decreased proportion of endemic algal species. The open-water complex of the alga species demonstrated that some non-endemic species exhibited positive trends. The zooplankton analyses demonstrated a noticeable increasing trend for total zooplankton, the main zooplankton components being Epischura baicalensis, as well as increased Cladoceran numbers. These trends can be hypothetically explained by the following: (i) global climate change (although Lake Baikal also exhibits long-term temperature oscillations); (ii) regional warming (due to construction of reservoir systems during the 1950s–1970s period); (iii) local chemical pollution attributable to increased industrial and agricultural activity in the lake's watershed and airshed basins; and/or (iv) the natural oscillating behaviour of the lake's plankton components.