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Using a cellular-automata model to investigate the effects of grazing on plateau pika population dynamics. (English) Zbl 1251.92043
Summary: The plateau pika is a keystone species of the Qinghai-Tibet plateau, but its overabundance aggravates the degradation of alpine meadows. Grazing is the most convenient manner to utilize alpine meadows. Grazing would change vegetation conditions, that is, change the habitat of plateau pika and so leads to variation of plateau pika populations. Based on ecological characteristics of plateau pika and alpine meadows, a cellular-automata model is established to investigate the influence of grazing on the dynamics of plateau pika populations. Vegetation shortens with the increase of grazing intensity. When grazing intensity is light, the height of vegetation under summer grazing, continuous grazing, rotational grazing and winter grazing decreases in turn. The ACC (average carrying capacity of plateau pika) is higher on degraded meadows and is lower on undegraded meadows. On undegraded meadow grazing affects the value of ACC, whereas, on degraded meadows grazing has a slight effect on it. On undegraded meadows, plateau pika occupies all cells fastly, the amount of damaged cells and the average amount of live holes in occupied cells decreases or holds the line on a temporal dimension. On degraded meadows, the dispersal of plateau pika is restrained, the amount of damaged cells and the average amount of live holes in occupied cells increases by the temporal dimension.
MSC:
92D40Ecology
68Q80Cellular automata (theory of computing)
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