Effects of density dependence and climatic factors on population dynamics of Cricetulus barabensis: a 25-year field study

文献类型： 外文期刊

第一作者： Shuai, Ling-Ying

作者： Shuai, Ling-Ying;Wang, Li-Qing;Yang, Yu-Ping;Zhang, Fu-Shun

作者机构：

关键词： climate; density dependence; grassland; hamster; Inner Mongolia; population dynamics; rainfall; reproduction; rodent; temperature

期刊名称：JOURNAL OF MAMMALOGY （ 影响因子：2.416； 五年影响因子：2.901 ）

ISSN： 0022-2372

年卷期： 2020 年 101 卷 2 期

页码：

收录情况： SCI

摘要： Rodents often act as keystone species in communities and play important roles in shaping structures and functions of many ecosystems. Understanding the underlying mechanisms of population fluctuation in rodents is therefore of great interest. Using the data from a 25-year field survey carried out in Inner Mongolia, China, we explored the effects of density dependence, local climatic factors, and a large-scale climatic perturbation (El Nino-Southern Oscillation) on the population dynamics of the striped hamster (Cricetulus barabensis), a rodent widely distributed in northern China. We detected a strong negative density-dependent effect on the population dynamics of C. barabensis. Rainfall had a significant positive effect on population change with a 1-year lag. The pregnancy rate of C. barabensis was negatively affected by the annual mean temperature in the current year, but positively associated with the population density in the current year and the annual Southern Oscillation Index in the previous year. Moving-window analyses suggested that, with a window length of 12 years, there was a significant interaction between rainfall and density dependence, with increasing rainfall alleviating the negative effect of density dependence. As C. barabensis often causes agricultural damage and can transmit zoonotic diseases to human beings, our results also have implications for pest and disease control.

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