MODELING OF THE RODENTS ABUNDANCE IN FOREST HABITATS OF THE WESTERN PODILLIA (MYODES GLAREOLUS)

I. M. Grod, I. V. Zagorodniuk, L. O. Shevchyk, N. Ya. Kravets

Abstract


Monitoring and predicting the dynamics of abundance of species living in natural habitats is an important component stability analysis of ecosystem as well as dynamics and direction of change of biotic communities under global climate change and pressure of the alien species. The aim of the work was to build a matrix model and study the state of stabilisation of the dynamics of the bank vole population within the Leslie model. The object of the study was the population dynamics of Myodes glareolus Schreber, 1780 = Clethrionomys glareolus auct. The study is based on materials obtained during 2017–2019. This period covered one phase of the long-term population dynamics of the bank vole, named “population growth”. The research was carried out according to generally accepted methods. A total of 6400 trap-days were processed, and 358 forest fistulas were collected and studied. The intensity of harmful activity of rodents is due to the variability of the number of animals in the population. The quantitative population changes are the result of three factors: births, deaths, and migrations. The main condition for the existence of the species is the stability of the population, which is determined by the action of thecompensatory mechanisms. The growth phase of the bank vole lasted all three years of the research, the quantitative indicators were respectively: 2017 – 1.8 individuals per 100 trap-days; 2018 – 2.0 individuals per 100 trap-days; 2019 – 2.7 individuals per 100 trap-days. Low levels of the abundance in the spring of each year of the study, namely at the beginning of the breeding season (3.7 – 2.6 – 8.9 individuals per 100 trap-days). Favourable for the abundance growth was the sex ratio of the population (approximately 1:1), with some rise in the share of females, which decreases on the period of spring 2018 to autumn 2019). Some decrease in the share of immature individuals (4.5 – 3.9 – 3.1 %) is an indirect confirmation of the stability of puberty of animals with subsequent replenishment of the "stock", which led to accelerated reproduction and, consequently, provided prerequisites for further population growth. The causal mechanisms of population control established by us, without a doubt, can serve as a basis for further prognosis, of the number of pests in natural habitats. To predict population changes, the Leslie model, which is widely used in mathematical analyses of the abundance of both plant and animal groups, was chosen. The algorithm for building a matrix model, detailed in the article, has five following steps. The exponential nature of the actual and projected growth of the bank vole population during the five-year cycle (2017–2019 with a prognosis until 2023) revealed in the analysis can be explained not so much by the power of the species' reproductive potential as by the lack of the significant changes in habitat, caused by constant weather conditions, low individual mortality from predators and non-communicable diseases or other accidents. The application of the matrix model allowed to confirm the key role of the main compensatory mechanisms of population dynamics, as they contribute to the stabilisation of the population and, as a consequence, are an important condition for the existence of the species.

Keywords


Myodes glareolus; population quantity; demographic structure; Leslie model; survival rate; fertility rate; exponential population curve

References


Balakireva A. G., Melashchenko O. P. O shirokom primenenii modeli Lesli k izucheniiu dinamicheskikh sistem. Visnyk Zaporiz'koho natsional'noho universytetu. Fizyko-matematychni nauky. 2013. 1. S. 4–9. [in Russian]

Delehan I. V., Delehan I. I., Delehan I. I. Biolohiia lisovykh ptakhiv i zviriv / za red. I. V. Delehana. Lviv : Polli, 2005. 600 s. [in Ukrainian]

Vplyv myshopodibnykh hryzuniv na intensyvnist rozkladannia pidstylky v osnovnykh lisovykh bioheotsenozakh Prysamaria / Pakhomov O. Ie., Dubyna A. O., Reva O. A., Shulman M. V. Pytannia stepovoho lisoznavstva ta lisovoi rekul'tyvatsii zemel'. 2017. 46. S. 102–105. [in Ukrainian]

Hemorahichna hariachka z nyrkovym syndromom v Ukraini / Nebohatkin I. V., Novokhatniy Yu. O., Demchyshyna I. V. ta in. Aktualna infektolohiia. 2020. 8 (3). S. 7–12. [in Ukrainian]

Єvstaf'ev I. Metodologiia sistemnogo analiza: teoriia i praktika ekologo-epizootologicheskogo prognoza.. Monitorynh teriofauny / za red. I. Zahorodniuka. Seriia: Pratsi Teriolohichnoi Shkoly. Luhans'k, 2010. 10. S. 6–12. [in Russian]

Ievstaf’iev I. L. Teriolohichni doslidzhennia: epizootolohichni aspekty (vstup do epizootolohii) Novitates Theriologicae. 2017. 10. 18–32. [in Ukrainian]

Zahorodniuk I. V., Iemelianov I. H. Taksonomiia i nomenklatura ssavtsiv Ukrainy. Visnyk Natsionalnoho naukovo-pryrodnychoho muzeiu. 2012, 10. S. 5–30. [in Ukrainian]

Zahorodniuk I. V. Norytsi (Rodentia: Arvicolidae) v baseyni Siverskoho Dintsia: biotopnyy rozpodil, zminy arealiv, vydova identyfikatsiia. Visnyk Kharkivskoho natsionalnoho universytetu imeni V.N. Karazina. Seriia : Biolohiia. 2008. 814. (7). S. 74–93. [in Ukrainian]

Kucheriavyі V. P. Zahalna ekolohiia : pidruch. dlia stud. vyshchykh navch. zakl. Lviv : Svit, 2016. 216 s. [in Ukrainian]

Mezhzherin V. A., Semeniuk S. K. Rol' prostranstvennoy struktury populiatsii ryzhey polevki Clethionomys glareolus (Rodentia, Arvecolidae) v protsesakh samoreguliatsii. Vesnik zoologi. Kiev, 2001. 35 (4): 93–96. [in Russian]

Stankevych S. V., Zabrodina I. V. Monitorynh shkidnykiv silskohospodarskykh kultur: navch. posibnyk. Kh.: FOP Brovin O. V., 2016. 216 s. [in Ukrainian]

Naglov V., Zagorodniuk I. Statisticheskiі analiz priurochennosti vidov i struktury soobshchestv. Teriofauna skhodu Ukrainy. Pam’iati Oleksandra Kondratenka / pid red. I. Zahorodniuka. Pratsi Teriolohichnoi Shkoly.2006.7. S. 291–300. [in Russian]

Naglov V. Znachenie vidov melkikh mlekopitaiushchikh v epizootiiakh tuliaremii na territorii Khar'kovskoy oblasti. Pratsi Teriolohichnoi Shkoly.2014. 12. S.47–55 [in Russian]

Rudyshyn M. P. Myshovydni hryzuny-shkidnyky ta zakhody borotby z nymy. Biuleten silskohospodarskoi informatsii. 1957. S. 51–53. [in Ukrainian]

Stetsula N. Dynamichna komponenta u skladi teriofauny Skolivskykh Beskyd (Ukrainski Karpaty). Theriologia Ukrainica. Kyiv. 2019. 17. 43–54. doi.org/10.15407/pts2019.17.043. [in Ukrainian]

Khrebetni tvaryny zakhidnykh oblastey Ukrainy : navch. posib / za red. Tsaryk Y. V. ta in. Lviv : Vydavn. tsentr LNU, 2003. 52 s. [in Ukrainian]




DOI: https://doi.org/10.25128/2078-2357.21.1-2.3

Refbacks

  • There are currently no refbacks.


Copyright (c) 2021 I. M. Grod, I. V. Zagorodniuk, L. O. Shevchyk, N. Ya. Kravets

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.