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

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Kahilainen , K K , Thomas , S M , Harrod , C , Hayden , B & Eloranta , A P 2019 , ' Trophic ecology of piscivorous Arctic charr (Salvelinus alpinus (L.)) in subarctic lakes with contrasting food-web structures ' , Hydrobiologia , vol. 840 , no. 1 , pp. 227-243 . https://doi.org/10.1007/s10750-018-3845-z

Title: Trophic ecology of piscivorous Arctic charr (Salvelinus alpinus (L.)) in subarctic lakes with contrasting food-web structures
Author: Kahilainen, K. K.; Thomas, S. M.; Harrod, C.; Hayden, B.; Eloranta, A. P.
Contributor: University of Helsinki, Kilpisjärvi Biological Station
Date: 2019-09
Language: eng
Number of pages: 17
Belongs to series: Hydrobiologia
ISSN: 0018-8158
URI: http://hdl.handle.net/10138/309195
Abstract: 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.
Subject: Diet
Food-chain length
Polymorphism
Predation
Stable isotopes
Whitefish morphs
TROUT SALMO-TRUTTA
WHITEFISH COREGONUS-LAVARETUS
DIEL VERTICAL MIGRATIONS
STABLE-ISOTOPE RATIOS
CLIMATE-CHANGE
COMMUNITY
FISH
PREDATORS
GROWTH
ZOOPLANKTON
1172 Environmental sciences
1181 Ecology, evolutionary biology
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