Kareiva P M
Division of Biology, Brown University, 02912, Providence, RI, USA.
Oecologia. 1983 Mar;57(3):322-327. doi: 10.1007/BF00377175.
A simple passive diffusion model is used to analyze the local within-habitat dispersal of twelve species of herbivorous insects. The data comprise field mark-recapture studies in relatively homogeneous habitats. For eight of the species, the cumulative frequency distributions of dispersal distances are consistent with a model of movement by passive diffusion. The observed departures from passive diffusion indicate the directions in which we need to modify our mathematical descriptions of movement if we are to develop realistic models of population dynamics and dispersal. The analyses also synthesize in a standard way the relative dispersal rates of several ecologically similar species. The variation both within and between species in diffusion coefficients is striking-certainly sufficient to generate significant consequences for population dynamics and interactions.
一个简单的被动扩散模型被用于分析12种植食性昆虫在栖息地内的局部扩散情况。数据包括在相对同质栖息地进行的野外标记重捕研究。对于其中8个物种，扩散距离的累积频率分布与被动扩散运动模型一致。观察到的与被动扩散的偏差表明，如果我们要建立现实的种群动态和扩散模型，就需要在哪些方向上修改我们对运动的数学描述。这些分析还以标准方式综合了几种生态相似物种的相对扩散率。扩散系数在物种内部和物种之间的变化都很显著——肯定足以对种群动态和相互作用产生重大影响。
