Underwood A J
School of Biological Sciences, University of Sydney, Zoology Building, 2006, Sydney, N.S.W., Australia.
Oecologia. 1978 Jan;36(3):317-326. doi: 10.1007/BF00348057.
A simple method for detecting non-random patterns of distribution of the boundaries of species is described. The method uses transects running across a community, where the number of upper and lower boundaries of species in each quadrat is recorded. The expected number of quadrats containing one or more boundaries can be calculated from the binomial distribution. The mean deviation of observed from expected number of such quadrats, for a set of transects, can be tested for departures from zero. Significant departures greater than zero indicate regular dispersion of boundaries. A mean deviation significantly less than zero indicates clustering of the boundaries. The method is unbiased and thus corrects previously published methods.
本文描述了一种检测物种边界非随机分布模式的简单方法。该方法使用横穿群落的样带，记录每个样方中物种上下边界的数量。包含一个或多个边界的样方的预期数量可根据二项分布计算得出。对于一组样带，此类样方的观测数量与预期数量的平均偏差可检验是否偏离零值。大于零的显著偏差表明边界呈规则分布。显著小于零的平均偏差表明边界呈聚集分布。该方法无偏差，因此纠正了此前发表的方法。
