Abstract

Results of a study of the water temperature and phytoplankton abundance in different regions of Lake Baikal according to 15 expeditions from 1994 to 2013 during late summer are present. The spatial distribution and interannual dynamics of phytoplankton are analyzed. The total abundance of phytoplankton in late summer is shown to be high. Its average long-term value for all of the open area of Lake Baikal is 532 ± 17 thousand cells/L. In Southern Baikal, the west coast is characterized by higher average phytoplankton abundance; in Middle and Northern Baikal, the east coast is rich. No significant differences were found between the hollows of the lake in terms of the development of late summer phytoplankton. The long-term average abundance of phytoplankton in the southern, middle, and northern hollows differs only by ≤1.2 times, but in the middle hollow it is significantly higher than in the northern. In the long-term dynamics, no significant increase in the abundance of late summer phytoplankton was recorded in any of the regions of the lake. The dependence of the total phytoplankton abundance on water temperature is weak; the correlation coefficients between the average annual values ​​of these indicators are ≤0.50.

中文翻译：

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夏末贝加尔湖浮游植物的时空变化：I.水温和浮游植物丰度

摘要

根据1994年至2013年夏季末的15次考察，得出了贝加尔湖不同地区水温和浮游植物丰度的研究结果。分析了浮游植物的空间分布和年际动态。夏末的浮游植物总丰度很高。贝加尔湖所有开放区域的平均长期价值为532±17,000细胞/ L。在贝加尔湖南部，西海岸的特征是浮游植物的平均平均丰度较高。在贝加尔湖中部和北部，东海岸十分丰富。就夏末浮游植物的发育而言，在湖泊的凹陷之间没有发现显着差异。南部，中部和北部凹陷的浮游植物的长期平均丰富度相差仅≤1.2倍，但在中空地带明显高于北部。在长期动态中，在该湖的任何区域中，未记录到夏末浮游植物的丰度显着增加。总浮游植物丰度对水温的依赖性较弱；这些指标的年平均值之间的相关系数≤0.50。