Acknowledgements:
I am grateful to Peter Eklöv, who supported all steps of this project. I
further thank Leonie Haferkemper and Holger Villwock who have been an
amazing help in the field and lab. Kasparas Bublys conducted the gut
content analyses and Jenny Schulz created the map. Richard Svanbäck
helped with discussions on individual specialization and Asbjørn
Vøllestad gave insights to minnow population structure. Financial
support came from the Knut and Alice Wallenberg foundation (grant KAW
2013.0091) and the Olsson Borghs stiftelse.