Lang Horst H
Zoologisches Institut der Technischen Hochschule Darmstadt, Darmstadt, Deutschland.
Fachbereich Biologie der Universität Konstanz, Konstanz, Deutschland.
Oecologia. 1975 Dec;20(4):311-320. doi: 10.1007/BF00345521.
From photographic recordings the distribution of individuals of the back swimmer Notonecta glauca in natural and artificial populations of various densities and sex ratios were analysed. The distances between each animal and its nearest neighbour were measured and compared with calculated data from population models with known dispersion patterns. It was shown that each back swimmer population with a higher density than 6 animals per m follows a random distribution. Varying the ratio of males to females in the population has no influence on the type of dispersion nor has age from 3. instar to imago. In populations with smaller densities than 7 animals per m the difference in average interindividual distance between a random dispersion model and a uniform dispersion model is not significant for each density. Therefore it is impossible to decide whether Notonecta-populations with these low densities are randomly or uniformly distributed. The agreement of the dispersion pattern of the back swimmer populations with a random distribution indicates the absence of any behaviour affecting dispersion of this predatory water bug.
通过摄影记录，分析了不同密度和性别比的自然种群及人工种群中仰泳蝽（Notonecta glauca）个体的分布情况。测量了每只动物与其最近邻体之间的距离，并与具有已知分布模式的种群模型计算数据进行比较。结果表明，每立方米密度高于6只动物的仰泳蝽种群呈随机分布。改变种群中雄性与雌性的比例对分布类型没有影响，从三龄幼虫到成虫的年龄阶段也没有影响。在每立方米密度小于7只动物的种群中，对于每个密度而言，随机分布模型和均匀分布模型之间的平均个体间距离差异不显著。因此，无法确定这些低密度的仰泳蝽种群是随机分布还是均匀分布。仰泳蝽种群的分布模式与随机分布相符，这表明不存在任何影响这种捕食性水生蝽类分布的行为。
