Agricultural irrigation mediates climatic effects and density dependence in population dynamics of Chinese striped hamster in North China Plain
Article first published online: 2 OCT 2012
© 2012 The Authors. Journal of Animal Ecology © 2012 British Ecological Society
Journal of Animal Ecology
Volume 82, Issue 2, pages 334–344, March 2013
How to Cite
Yan, C., Xu, L., Xu, T., Cao, X., Wang, F., Wang, S., Hao, S., Yang, H., Zhang, Z. (2013), Agricultural irrigation mediates climatic effects and density dependence in population dynamics of Chinese striped hamster in North China Plain. Journal of Animal Ecology, 82: 334–344. doi: 10.1111/j.1365-2656.2012.02037.x
- Issue published online: 18 FEB 2013
- Article first published online: 2 OCT 2012
- Manuscript Accepted: 14 AUG 2012
- Manuscript Received: 1 APR 2012
- agricultural activity;
- global warming;
- human disturbance;
- small mammal
- Several studies show that climatic (extrinsic) factors can interact with density-dependent (intrinsic) factors to alter long-term population dynamics, yet there is a surprising lack of investigations of how anthropogenic disturbance modifies such dynamics. Such interactions could be especially important in agricultural systems subject to climate change.
- We investigated the effects of density dependence, climate, recurrent disturbance from flood irrigation and their interactions on the population dynamics of an important rodent pest, the Chinese striped hamster (Cricetulus barabensis), over 27 years in the croplands of the North China Plain.
- Strong density-dependent feedbacks occurred at both annual and seasonal scales. While warmer weather increased population sizes in nonbreeding seasons, this effect was counteracted by the negative effect of flood irrigation in breeding seasons. Precipitation showed significant positive effects in nonbreeding seasons, but negative effects in breeding seasons.
- There were important interactions between intrinsic dynamics, extrinsic dynamics and disturbance. Low temperature significantly increased the strength of density dependence in nonbreeding seasons, whereas intensification of flood irrigation area significantly increased the strength of density dependence but reduced the effect of summer precipitation in breeding seasons.
- Overall climate change is expected to increase population levels, but anthropogenic disturbance from flood irrigation will help prevent long-term population increases. The interactions between anthropogenic disturbance and both intrinsic and extrinsic (weather-driven) population dynamics caution that we need to consider anthropogenic disturbance as an integral component of population responses to climate change.