Effects of acorn abundance on density dependence in a Japanese wood mouse (Apodemus speciosus) population
Effects of acorn abundance on density dependence in a Japanese wood mouse (Apodemus speciosus) population
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DOI：
10.1007/s10144-008-0076-6
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发表时间：
2008-02
影响因子：
1.7
通讯作者：
T. Saitoh;J. Vik;N. Stenseth;T. Takanishi;Shintaro Hayakashi;N. Ishida;Masaaki Ohmori;T. Morita;S. Uemura;M. Kadomatsu;J. Osawa;K. Maekawa
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文献类型：
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作者：
T. Saitoh;J. Vik;N. Stenseth;T. Takanishi;Shintaro Hayakashi;N. Ishida;Masaaki Ohmori;T. Morita;S. Uemura;M. Kadomatsu;J. Osawa;K. Maekawa
利用时间序列数据（1992-2007）分析了松果丰度对日本大型木鼠特种姬鼠密度依赖性的影响。这些数据是在日本北海道北部的一个森林里通过捕捉啮齿动物和直接计数地面上的橡子获得的。在基于Gompertz和Ricker模型的所有模型中，一年的橡实丰度明显影响次年的木鼠丰度；此外，木鼠的丰度对种群数量也有影响。橡实丰度影响木鼠种群的密度依赖（种内竞争）强度。当橡实丰度较高时，密度依赖性减弱，种群增长率下降至零时的平衡密度增大。橡子丰度的这些效应被认为是一种非线性扰动效应（sensu Royama 1992）。密度依赖性的非线性也被检测到；高密度对人口增长率的影响更大。
We analysed the effects ofQuercus crispulaacorn abundance on the density dependence of the large Japanese wood mouseApodemus speciosususing 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.