Funding for this research was provided by:
Norges miljo- og biovitenskapelige universitet Fakultet for miljovitenskap og naturforvaltning (1750030012)
Text and Data Mining valid from 2018-11-16
Received: 17 July 2018
Accepted: 7 November 2018
First Online: 16 November 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.