Dynamics of the biological system in turbellarians inhabiting the littoral water bodies of Lake Baikal (Phagocata sibirica) subjected to stress: Model of coupled bistable oscillators

An experimental investigation into the behavior of turbellarians inhabiting the water bodies of the basin of Lake Baikal (Phagocata sibirica (Zabussov, 1903)) under the influence of light, toxicants, and both these factors allows one to find biosystem features under effects other than homeostasis. It is revealed that, when the system is subjected to increasing light intensity, it demonstrates turbulent oscillation with the effects of synchronization and desynchronization. An analysis of the experimental results within the framework of the theory of nonlinear dynamical systems shows that the behavior of the turbellarian biosystem corresponds to the model of coupled bistable oscillators, the synchronization of which is induced by internal biosystem noise.