Randolph S E
Department of Zoology, University of Oxford, U.K.
Med Vet Entomol. 1994 Oct;8(4):351-68. doi: 10.1111/j.1365-2915.1994.tb00099.x.
Eight sets of previously published data on the seasonal abundance of the tick Rhipicephalus appendiculatus in Burundi, Uganda, Tanzania and Zimbabwe are analysed to yield seasonal mortality indices. Correlations between these indices and abiotic (climatic) and biotic (tick density) variables suggest that it is the stage from females to larvae that is most sensitive to adverse abiotic conditions, specifically low moisture availability. Mortality at the other stages of the tick's life cycle is strongly density-dependent. The precise nature of this density-dependence suggests that it may be caused by acquired resistance to ticks by cattle. Robust correlations between satellite-derived vegetation indices, climatic factors and mortality indices suggest that detailed climatic data, often unavailable, may be replaced by satellite data, now widely available, for use in modelling tick populations.
对布隆迪、乌干达、坦桑尼亚和津巴布韦已发表的八组有关微小扇头蜱季节性丰度的数据进行分析，以得出季节性死亡率指数。这些指数与非生物（气候）和生物（蜱密度）变量之间的相关性表明，从雌性到幼虫阶段对不利的非生物条件最为敏感，特别是水分供应不足。蜱虫生命周期其他阶段的死亡率强烈依赖于密度。这种密度依赖性的确切性质表明，它可能是由牛对蜱虫获得性抗性引起的。卫星衍生植被指数、气候因素和死亡率指数之间的稳健相关性表明，通常无法获取的详细气候数据可能会被如今广泛可用的卫星数据所取代，用于蜱虫种群建模。
