Cyclic Processes in Ground Beetle Populations of Calathus micropterus Duft. in the Northern Baikal Region

Analysis of long-term series of observations of biota representatives is one of the most important tasks of modern ecology. The subject of the study in this article is the identification of a cyclic component in long-term numerical series of ground beetles Calathus micropterus Duft. The aim of the study is a comparative analysis of the cyclicity of long-term series of population dynamics of a model species in mountainous conditions. The studies were conducted in characteristic biotopes of the high-altitude transect of the western macroslope of the Barguzinsky ridge. The results of one-dimensional Fourier spectral analysis of 14 numerical series of model type with a duration of 20 and 33 years are presented. Spectral analysis made it possible to detect hidden periods, calculate their power, and the moving average smoothing method eliminated random periodic components. It has been established that in the abundance spectra of C. micropterus the sections of the high-altitude transect contain a total of 7 cycles of varying strength, with 2-year cycles dominating in frequency. The periods in the 6- and 11-year frequency bands associated with the rhythm of climate change and solar activity are secondary. The shorter numerical series of the lake coast has 5 cycles, the main ones are 3- and 4-year cycles, which are synchronized with the cyclicity of weather parameters. The 8-year and 5-year cycles have considerable power. The studied species coordinates its population dynamics mainly with the cyclicity of meteorological parameters: air temperature and precipitation.