Funding for this research was provided by:
Svenska Forskningsrådet Formas (2011-1640)
Text and Data Mining valid from 2020-01-06
Received: 8 February 2019
Revised: 19 June 2019
Accepted: 19 December 2019
First Online: 6 January 2020
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. Ethical permission was granted from The Swedish Board of Agriculture (number: 131-2014).
: Permits for sampling and observational field studies are not applicable.
: The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
: TABS, PH, NS, SAW and MG conceived and designed research. TABS, PH, NS and FVDM conducted field work. TABS, PH and MG analyzed data. All authors contributed to writing the manuscript. All authors read and approved the manuscript.