POPULATION FLUCTUATION OF ERMINE (MUSTELA ERMINEA L., 1758) IN TRANSBAIKAL REGION (RUSSIA)

Gennady Maksimovich Agafonov, Lev Nikolaevich Erdakov

Abstract


Summary: Population dynamics of ermine has been studied for a long time. Cyclicality of this dynamics with periods of 2-11 years in different parts of species range is registered. We analyzed data on acquisition of ermine furs in 14 districts of Transbaikal krai for the period of 19 years (1971-89). We assumed that this data generally reflects long-term abundance dynamics of ermine in hunting area. Analysis of population dynamic of ermine basing on the acquisitions of furs in different districts of Transbaikalia allowed us to identify the fact that complex curves of acquisition dynamics are superposition of different cycles, which are distinct in period and power. With the employment of time-series analysis, which is graphically depicted as chronograms of abundance dynamics in different districts, we constructed distinctive figures of rhythm spectra and conducted visual comparison of this figures for different districts. We divided all districts into three groups according to the form of spectrum of abundance cycles. The first group mainly includes low frequency rhythms (12-22 years), in the second group these rhythms are totally absent. The third group of spectra is intermediate; it includes rhythms in all frequency bands which are specific for this specie. High frequency rhythms are indicative for the majority of spectra, and about 4 years cycles are indicated in all spectra without any exclusion. For the first time description for low frequency cycles (16-26 years) were given. It seems that most probably the spectrum of 6-8 visible periodicities is specific for ermine, but only part of these periodicities appear in each region. Full spectrum of rhythms of ermine, probably, will be displayed using longer-term records.


Keywords


ermine, population fluctuation, rhythms, spectral analysis

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DOI: http://dx.doi.org/10.15679/bjwr.v2i1.21

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ISSN: 2335-0113

Publisher: Visio Mundi Academic Media Group

Creative Commons License
This journal is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.