Home – Home – Jornals – Contemporary Problems of Ecology 2018 number 6

The work is directed on proceeding study of cyclicity of long-term (1980-2010) population dynamics in odonates in the lake Chany basin (the south of Western Siberia). Four sympatric species of the genus Sympetrum were investigated with using of spectral analysis method. The cycle spectra of population dynamics have been constructed for each species, and the basic parameters of these cycles (period, phase, power) are calculated. The special number cycles were found in each species. Interspecific distinctions amplified in the direction from high to low frequencies of the spectrum. In cases of similar cycles an interspecific distinction was shown in the ratio of cycle powers and/or phases: identical phases can indicate ability of species to increase their number synchronously with any of close species, different phases can indicate opportunity in small species to reach its number maximum against number minimum at numerous species. Comparison of sympatric species spectra of the genera Coenagrion and Sympetrum has led to the conclusion that the more similarity in environmental standards among species inside genus (as at Sympetrum ), the more specific the species frequency spectra. All species of the genus Sympetrum can synchronize their number fluctuations with 2-3 and 4-5-years’ fluctuations of the local climate. Also the specific synchronization with important nature-climatic rhythms was found at each species: at S. danаe - with 18-year rhythm of the lake Chany level and with 16-year of June temperatures; at S. flaveolum - with 24-year briknerovsky, with 8-year of rainfall and with 28-year of April and May temperatures; at S. vulgatum - with 40-42-year of the lake Chany level, with 12-year of rainfall and with 7-year of April and June temperatures; at S. sanguineum - with 7-year of April and June temperatures. Perhaps, in the long-term number fluctuations of species the adaptation mechanism of species to each other and to environment is concluded.