The population biology of the free-living phase of Haemonchus contortus
The population biology of the free-living phase of Haemonchus contortus
复制标题
捻转血矛线虫自由生活阶段的种群生物学
作者：
G. Smith
本文描述了捻转血矛线虫自由生活阶段的一个确定性种群模型。该模型由三个部分组成：感染前阶段，包括鸡蛋和第一和第二阶段的幼虫相结合;第三阶段的幼虫在粪便中;和第三阶段的幼虫在牧场上。每个阶段的死亡率（μj）是温度（K，其中K =（摄氏度+30）/100）的函数，形式为μj = aj exp [xj K] + bj exp [- βj K]。第二次换羽的最短时间（γ）和此后的换羽率（σ）也是温度的函数（分别为In [1/γ] = c1 + c2[1/K]和σ = d1 exp [d2 K]）。将L3幼虫从粪便中移出的速率视为常数（0.165/幼虫/天）。
A deterministic model for the demography of the free-living stages of Haemonchus contortus is described. The model consists of three compartments: the pre-infective stages, comprising the eggs and first- and second-stage larvae combined; third-stage larvae in the faeces; and third-stage larvae on the pasture. The mortality (μj) of each of these stages was a function of temperature (K, where K = (degrees Celsius + 30)/100) of the form, μj = aj exp [xj K] + bj exp [– βj K]. The minimum time to second moult (γ) and the moulting rate thereafter (σ) were also functions of temperature (In [1/γ] = c1 + c2[1/K], and σ = d1 exp [d2 K] respectively). The rate at which L3 larvae migrated out of the faeces was treated as a constant (0.165/larva/day).