Breyev K A
Folia Parasitol (Praha). 1976;23(4):343-56.
The type and parameters of the distribution of the second and third instar larvae of Hypoderma bovis in cattle herds in Czechoslovakia (54 herds, 7233 head), Mongolia (20 herds, 1809 head) and the USSR (48 herds, 4978 head) were studied. A statistical analysis showed a) that in the majority of cases negative binomial distribution serves as a model of the distribution of larvae with sufficient reliability; b) that the regularity of dependence of the distribution exponent k of the negative binomial distribution on the incidence of infestation remains constant in different parts of the range of thes warble fly. The latter fact indicates that the regulatory systems limiting the population numbers of this warble fly are associated with host-parasite relationships and do not depend on a complex of conditions specific for various natural zones. In order to understand the regulatory processes in parasite populations it is necessary to study equally the regulatory mechanisms operating primarily on the level of specimens as well as the regulatory systems operating on the level of populations.
对捷克斯洛伐克（54个畜群，7233头牛）、蒙古（20个畜群，1809头牛）和苏联（48个畜群，4978头牛）牛群中牛皮蝇二龄和三龄幼虫的分布类型及参数进行了研究。统计分析表明：a）在大多数情况下，负二项分布可作为幼虫分布的模型，具有足够的可靠性；b）负二项分布的分布指数k对感染发生率的依赖规律在皮蝇分布范围的不同区域保持不变。后一事实表明，限制这种皮蝇种群数量的调节系统与宿主-寄生虫关系有关，并不依赖于不同自然区域特有的一系列条件。为了理解寄生虫种群中的调节过程，有必要同等地研究主要在个体水平上起作用的调节机制以及在种群水平上起作用的调节系统。
