The population dynamics of the voleClethrionomys rufocanus in Hokkaido, Japan
The population dynamics of the voleClethrionomys rufocanus in Hokkaido, Japan
复制标题
日本北海道田鼠Clethrionomys rufocanus的种群动态
DOI：
10.1007/bf02765222
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
O. Bjørnstad
中科院分区：
文献类型：
--
作者：
T. Saitoh;N. Stenseth;O. Bjørnstad
根据225个时间序列（12 ~ 31年）描述了日本北海道灰侧田鼠的种群动态，其中194个时间序列的长度为23年或更长。根据地理位置和北海道的地形特征，将时间序列分为11组。种群间的平均丰度从1.07到21.07个个体/150个陷阱夜不等。群体波动的变异性指数（s指数）范围为0.204 - 0.629。群体变异性的另一个指数（log-10尺度上的振幅）范围为0.811至2.743。平均丰度和变异的人口较高的北方和东部地区的岛屿。除最南端的种群外，大多数种群在种群增长中表现出显著的直接密度依赖性。延迟密度依赖性的检出率在组间从0%至22.6%不等。直接和延迟的密度依赖性在更北方和东部的人群中往往更强。循环种群的比例在北方-东部地区高于西南部地区。从西南部的非同步种群到东北部的高度同步种群有明显的梯度。
Population dynamics of the gray sided‐vole,Clethrionomys rufocanus, in Hokkaido, Japan were described on the basis of 225 time series (being from 12 to 31 years long); 194 of the time series have a length of 23 years or longer. The time series were classified into 11 groups according to geographic proximity and topographic characteristics of the island of Hokkaido. Mean abundance varied among populations from 1.07 to 21.07 individuals per 150 trap‐nights. The index of variability for population fluctuation (s‐index) ranged from 0.204 to 0.629. Another index for population variability (amplitude on log‐10 scale) ranged from 0.811 to 2.743. Mean abundance and variability of populations were higher in the more northern and eastern regions of the island. Most populations, except for the southernmost populations, exhibited significant direct density‐dependence in population growth. Detection rate for delayed density‐dependence varied among groups from 0% to 22.6%. Both direct and delayed density‐dependence tended to be stronger in the more northern and eastern populations. The proportion of cyclic populations was higher in the northern‐eastern areas than that in the southern‐western areas. There was a clear gradient from the asynchronous populations in southwest, to the highly synchronized populations in the northeast.