Funding for this research was provided by:
National Natural Science Foundation of China (31702014)
Text and Data Mining valid from 2018-12-07
Received: 18 July 2018
Accepted: 3 December 2018
First Online: 7 December 2018
Compliance with ethical standards
: The authors declare there are no competing interests.
: The sampling location was not privately-owned or protected, and field sampling did not involve protected species.