Krohne D T, Burgin A B
Department of Biology, Wabash College, 47933, Crawfordsville, IN, USA.
Biology Department, Indiana University, 47405, Bloomington, IN, USA.
Oecologia. 1990 Jan;82(1):97-101. doi: 10.1007/BF00318539.
The patterns of spatial heterogeneity in density and demography were studied in a population of Peromyscus leucopus inhabiting a deciduous forest in west-central Indiana. A series of 9 live-trapping grids sampled densities from 3 spatial scales: 3 ha, 80 ha and 350 km. We found high levels of variation within all three spatial scales. There was as much variation within a single, large grid as within the entire Sugar Creek Valley (350 km). The patterns of density variation were not temporally stable and thus represent variation in demographic processes rather than simply differences in habitat quality. We suggest that the Sugar Creek Valley represents a metapopulation of Peromyscus leucopus composed of a number of temporally unstable subpopulations. This structure provides considerable demographic variation that dispersing animals can exploit.
在印第安纳州中西部一片落叶林中栖息的白足鼠种群中，研究了密度和种群统计学的空间异质性模式。一系列9个活体诱捕网格从3个空间尺度上对密度进行了采样：3公顷、80公顷和350平方千米。我们发现在所有这三个空间尺度内都存在高度的变异性。在单个大网格内的变异性与整个糖溪谷（350平方千米）内的变异性一样大。密度变化模式在时间上并不稳定，因此代表的是种群统计学过程中的变异，而不仅仅是栖息地质量的差异。我们认为糖溪谷代表了一个由许多时间上不稳定的亚种群组成的白足鼠集合种群。这种结构提供了相当大的种群统计学变异，可供扩散的动物利用。
