Leung B
Department of Biology, Carleton University, Ottawa, Ontario, Canada.
Int J Parasitol. 1998 Nov;28(11):1709-12. doi: 10.1016/s0020-7519(98)00128-3.
Parasites are typically aggregated on their hosts in nature. The null hypothesis is that parasites should follow a Poisson distribution if environment, parasites and hosts are homogeneous. From this starting point, models have shown that factors such as heterogeneity in host susceptibility and spatial aggregations of parasites may cause parasite aggregations on hosts. I used computer simulations to show that parasites typically become aggregated on their hosts even in a homogeneous environment where parasites do not differentially prefer any host, and hosts do not differ in susceptibility, provided that hosts are randomly distributed and spatial distance between host and parasite influences the likelihood of colonisation.
在自然界中，寄生虫通常聚集在其宿主身上。零假设是，如果环境、寄生虫和宿主是均匀的，那么寄生虫应该遵循泊松分布。从这个出发点来看，模型表明，宿主易感性的异质性和寄生虫的空间聚集等因素可能导致寄生虫在宿主身上聚集。我通过计算机模拟表明，即使在寄生虫没有差异地偏好任何宿主且宿主易感性没有差异的均匀环境中，只要宿主是随机分布的，并且宿主与寄生虫之间的空间距离影响定殖的可能性，寄生虫通常也会在其宿主身上聚集。
