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Effects of acorn abundance on density dependence in a Japanese wood mouse (Apodemus speciosus) population

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Title: Effects of acorn abundance on density dependence in a Japanese wood mouse (Apodemus speciosus) population
Other Titles: Density dependence in wood mouse
Authors: Saitoh, Takashi Browse this author →KAKEN DB
Vik, Jon Olav Browse this author
Stenseth, Nils Chr. Browse this author
Takanishi, Toshikazu Browse this author
Hayakashi, Shintaro Browse this author
Ishida, Nobuo Browse this author
Ohmori, Masaaki Browse this author
Morita, Toshio Browse this author
Uemura, Shigeru Browse this author →KAKEN DB
Kadomatsu, Masahiko Browse this author
Osawa, Jun Browse this author
Maekawa, Koji Browse this author
Keywords: Dynamics
Intraspecific competition
Lateral perturbation effect
Nonlinear density dependence
Nonlinear perturbation effect
Issue Date: Apr-2008
Publisher: Springer Japan
Journal Title: Population Ecology
Volume: 50
Issue: 2
Start Page: 159
End Page: 167
Publisher DOI: 10.1007/s10144-008-0076-6
Abstract: We analysed the effects of Quercus crispula acorn abundance on the density dependence of the large Japanese wood mouse Apodemus speciosus using time series data (1992-2007). The data were obtained in a forest in northern Hokkaido, Japan, by live-trapping rodents and directly counting acorns on the ground. Acorn abundance in one year clearly influenced the abundance of wood mice in the following year in all models examined based on the Gompertz and Ricker model; in addition, the abundance of wood mice had effects on the population. Acorn abundance influenced the strength of density dependence (intraspecific competition) of the wood mouse population. When the abundance of acorns was high, density dependence was relaxed, and as a result the equilibrium density at which the population growth rate decreased to zero became higher. Those effects of acorn abundance were regarded as a nonlinear perturbation effect (sensu Royama 1992). The nonlinearity of density dependence was also detected; higher densities had stronger effects on population growth rates.
Rights: The original publication is available at
Type: article (author version)
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 齊藤 隆

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