Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, 142290, Russia.
Belarusian State University, 220030, Minsk, Belarus.
Sci Rep. 2022 Jul 13;12(1):11979. doi: 10.1038/s41598-022-16111-8.
The ecosystem of the Naroch Lakes (Belarus) includes three water bodies, Lake Batorino, Lake Myastro and Lake Naroch. These lakes have a common catchment area. At the end of the 80 s, the ecosystem of the Naroch Lakes underwent a transformation, during which the nutrient load on the catchment area decreased, and the concentration of phosphorus as a limiting factor in these water bodies decreased significantly. At the same time, the Naroch Lakes were exposed to zebra mussel (Dreissena polymorpha Pallas) invasion. In the mid-90 s, the biological and hydrochemical characteristics of the ecosystem of the Naroch Lakes stabilized. We show here that complex processes associated with the transformation of the lake ecosystem and affecting both trophic interactions in the Naroch Lakes and the influence of environmental factors on them can be represented using a single parameter, the phase-locking index, PLI. In this case, a statistically significant numerical value of PLI characterizes the phase synchronization of two processes, oscillations of the concentration of total phosphorus, TP, and oscillations of the concentration of chlorophyll, Chl. We show that the phase synchronization of these processes occurs only after the stabilization of the ecosystem of the Naroch Lakes. In the period preceding the transformation of the lake ecosystem, there was no synchronization. Numerical evaluation of PLI as a holistic parameter allows us to characterize the transformation of the lake ecosystem as a whole without resorting to study of complex interactions of various factors involved in this transformation.
纳罗奇湖（白俄罗斯）的生态系统包括三个水体：巴托里诺湖、迈斯特罗湖和纳罗奇湖。这些湖泊有一个共同的集水区。在 80 年代末，纳罗奇湖的生态系统发生了转变，在此期间，集水区的养分负荷减少，这些水体中磷的浓度作为限制因素显著下降。与此同时，纳罗奇湖受到斑马贻贝（Dreissena polymorpha Pallas）入侵的影响。90 年代中期，纳罗奇湖的生态系统的生物和水化学特征稳定下来。我们在这里表明，与湖泊生态系统转变相关的复杂过程，以及这些过程对纳罗奇湖的营养相互作用以及环境因素对它们的影响，可以用一个单一的参数，即锁相指数（PLI）来表示。在这种情况下，PLI 的统计数值可以表征两个过程的相位同步，即总磷（TP）浓度的波动和叶绿素（Chl）浓度的波动。我们表明，只有在纳罗奇湖生态系统稳定之后，这些过程才会发生相位同步。在湖泊生态系统转变之前的时期，没有同步发生。作为一个整体参数，对 PLI 的数值评估使我们能够整体上描述湖泊生态系统的转变，而无需研究涉及这一转变的各种因素之间的复杂相互作用。
