Funding for this research was provided by:
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (31003A_182265, 31003A_159579)
Bundesamt für Umwelt (none)
Text and Data Mining valid from 2019-07-15
Received: 24 January 2019
Accepted: 3 July 2019
First Online: 15 July 2019
: All methods were carried out in accordance with the relevant guidelines and regulations. The project was approved by the fishery inspectorate of the Bern canton and by the veterinary authority of the canton Vaud, Switzerland (approval number VD2956).
: All authors have read and approved the manuscript.
: The authors declare that they have no competing interests.