A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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-tekijät tai -toimittajat


Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: Kahilainen, K. K., Thomas, S. M., Harrod, C.; Hayden, B.; Eloranta, A. P.

Lehti tai sarja: Hydrobiologia

ISSN: 0018-8158

eISSN: 1573-5117

Julkaisuvuosi: 2019

Volyymi: 840

Lehden numero: 1

Artikkelin sivunumerot: 227-243

Kustantaja: Springer

Julkaisumaa: Sveitsi

Julkaisun kieli: englanti

DOI: https://doi.org/10.1007/s10750-018-3845-z

Julkaisun avoin saatavuus: Ei avoin

Julkaisukanavan avoin saatavuus:

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/66491


Tiivistelmä

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.


YSO-asiasanat: ravintoketjut; ravintoverkot; saalistus; nieriä; siika

Vapaat asiasanat: diet; food-chain length; polymorphism; predation; stable isotopes, whitefish morphs


Liittyvät organisaatiot


OKM-raportointi: Kyllä

Raportointivuosi: 2019

JUFO-taso: 1


Viimeisin päivitys 2021-10-11 klo 16:13