A1 Journal article (refereed)
Trophic ecology of piscivorous Arctic charr (Salvelinus alpinus (L.)) in subarctic lakes with contrasting food-web structures (2019)

Kahilainen, K.K., Hayden, B., & Eloranta, A. P. (2019). Trophic ecology of piscivorous Arctic charr (Salvelinus alpinus (L.)) in subarctic lakes with contrasting food-web structures. Hydrobiologia, 840(1), 227-243. https://doi.org/10.1007/s10750-018-3845-z

JYU authors or editors

Publication details

All authors or editorsKahilainen, K. K., Thomas, S. M., Harrod, C.; Hayden, B.; Eloranta, A. P.

Journal or seriesHydrobiologia



Publication year2019


Issue number1

Pages range227-243


Publication countrySwitzerland

Publication languageEnglish


Publication open accessNot open

Publication channel open access

Publication is parallel published (JYX)https://jyx.jyu.fi/handle/123456789/66491


The trophic ecology of piscivorous Arctic charr (Salvelinus alpinus (L.); charr) in the food webs of large subarctic lakes is not well understood. We assessed charr diets, parasites, growth, maturity, and stable isotope ratios in Fennoscandian subarctic lakes dominated by monomorphic or polymorphic whitefish (Coregonus lavaretus (L.)) populations. Charr density was low in all lakes, except in profundal habitats. Charr shifted to piscivory at small size (16–25 cm total length) and consumed a range of prey-fish sizes (2–25 cm). Cannibalism was observed in a few individuals from one monomorphic whitefish lake. Charr matured at 37–51 cm (5–8 years old), grew to 52–74 cm maximum observed length and 47–83 cm asymptotic length. Charr increased total area of convex hull and core stable isotopic diversity area of the fish community by 51–98% and 44–51% in monomorphic whitefish lakes, but only 8–11% and 7–10% in polymorphic whitefish lakes. The difference was due to increasing food-chain length in monomorphic whitefish lakes, whereas reliance on littoral carbon did not change. Charr were the top piscivores in monomorphic whitefish lakes, but played a less important role in polymorphic whitefish lakes, which contained a more diverse predator fauna.

Keywordsfood chainsfood webspredationarctic charCoregonus lavaretus

Free keywordsdiet; food-chain length; polymorphism; predation; stable isotopes, whitefish morphs

Contributing organizations

Ministry reportingYes

Reporting Year2019

JUFO rating1

Last updated on 2024-08-01 at 19:20