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A new geographical gradient in vole population dynamics.

E Tkadlec1, N C Stenseth

  • 1Department of Ecology, Palacky University, trida Svobody 26, 77146 Olomouc, Czech Republic. tkadlec@prfnw.upol.cz

Proceedings. Biological Sciences
|August 7, 2001
PubMed
Summary

Small rodent populations in Central Europe show a new geographical gradient. Common vole (Microtus arvalis) dynamics shift from stable in the north to cyclic in the south, influenced by seasonality.

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Area of Science:

  • Ecology
  • Zoology
  • Population Dynamics

Background:

  • Small rodent population dynamics are crucial for ecosystem health.
  • Previous studies identified gradients in rodent population cycles, such as the Fennoscandian gradient.
  • Understanding geographical variations in population dynamics is key to ecological research.

Purpose of the Study:

  • To investigate a novel geographical gradient in the population dynamics of the common vole (Microtus arvalis).
  • To analyze time-series data across Poland, the Czech Republic, and the Slovak Republic to identify patterns in vole population fluctuations.
  • To explore potential environmental factors driving observed population dynamics.

Main Methods:

  • Analysis of 29 time series of density indices for the common vole (Microtus arvalis).

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  • Statistical examination of variables including mean density, cycle amplitude, and density variability.
  • Application of a second-order autoregressive model to assess population dynamics.

    • Main Results:

    • A distinct geographical gradient in common vole population dynamics was identified across Central Europe.
    • Northerly populations in Poland exhibited greater stability, while southerly populations in the Slovak Republic showed increased variability and cyclicity.
    • Key population dynamic variables demonstrated consistent latitudinal variation, reversing the known Fennoscandian gradient.

    Conclusions:

    • The study reveals a new latitudinal gradient in common vole population dynamics, contrasting with previously described patterns.
    • Seasonality is proposed as a significant factor potentially explaining the observed gradient in population stability and cyclicity.
    • These findings contribute to understanding the complex factors influencing small rodent population regulation across geographical regions.