Mapping the Regional Transition to Cyclicity in Clethrionomys rufocanus: Spectral Densities and Functional Data Analysis

• BJØRNSTAD, Ottar N.

• STENSETH, Nils Chr.

• SAITOH, Takashi

• LINGJÆRDE, Ole Chr.

抄録

We study the regional transitions in dynamics of the gray-sided vole, Clethrionomys rufocanus, within Hokkaido, Japan. The data set consists of 225 time series of varying length (most from 23 to 31 years long) collected between 1962 and 1992 by the Forestry Agency of the Japanese Government. To see clearly how the periodic behavior changes geographically, we estimate the spectral density functions of the growth rates of all populations using a log-spline method. We subsequently apply functional data analysis to the estimated densities. The functional data analysis is, in this context, analogous to a principal component analysis applied to curves. We plot the results of the analysis on the map of Hokkaido, to reveal a clear transition from relatively stable populations in the southwest and west to populations undergoing 3-4 year cycles in the northeast and east. The degree of seasonality in the vegetation and the rodent demography appear to be strongest in the cyclic area. We briefly speculate that the destabilization of the rodent dynamics is linked to increased seasonal-forcing on the trophic interactions in which the gray-sided voles are involved.

収録刊行物

• Researches on population ecology

  Researches on population ecology 40 (1), 77-84, 1998

  Society of Population Ecology

キーワード

• biogeography
• microtine cycle
• population fluctuation
• scale of regulation
• seasonality

詳細情報

• CRID: 1050564288934834816
• NII論文ID: 10004818736
• NII書誌ID: AA00393554
• HANDLE: 2115/17000
• NDL書誌ID: 4655999
• ISSN: 00345466
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4655999
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • NDL
  • CiNii Articles