Funding for this research was provided by:
National Natural Science Foundation of China (31472012 to Y-HS, Nos. 31772453, 31970427 to WL)
Received: 12 April 2020
Accepted: 23 August 2020
First Online: 2 September 2020
Ethics approval and consent to participate
: The experiments reported here comply with the current laws of China. Fieldwork was carried out under the permission from Lianhuashan National Nature Reserve, Gansu, China. Experimental procedures were in agreement with the Animal Research Ethics Committee of Hainan Provincial Education Centre for Ecology and Environment, Hainan Normal University (permit no. HNECEE-2014-005).
: Not applicable.
: The authors declare that they have no competing interests. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.