Abstract

Using stable isotope analysis of nitrogen, for the first time the hypothesis on different sources of inorganic nutrients for two groups of littoral algae in Lake Baikal was confirmed. Strongly attached filamentous algae of genus Ulothrix, which developed in the wave-braking zone at depth 0.5 m, and loosely attached filamentous algae of genus Spirogyra, which developed in deeper layers 3.0–5.0 m in a low-turbulence zone, get inorganic nutrients presumably from surface discharge and groundwater inputs, respectively. Besides, stoichiometric ratios C:N and N:P in biomass of the algae indicated that growth of Spirogyra in Lake Baikal was likely limited by nitrogen, while growth of Ulothrix was limited by phosphorus.

中文翻译：

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贝加尔湖的螺旋藻生物量中氮的同位素组成和元素的化学计量比。

摘要

使用氮的稳定同位素分析，首次证实了贝加尔湖两组沿海藻类的无机养分来源不同的假说。Ulothrix属的牢固附着的丝状藻类在波浪制动带中深达0.5 m处发育，而Spirogyra属的松弛附着的丝状藻类在低湍流区中较深的3.0-5.0 m层中发育，可以得到无机养分分别来自地表排放和地下水输入。此外，化学计量比C：N和N：P在藻类生物量表明的生长水绵在贝加尔湖可能是由氮的限制，而生长Ulothrix通过磷的限制。