Trophic ecology of piscivorous Arctic charr (Salvelinus alpinus (L.)) in subarctic lakes with contrasting food-web structures
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...
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ftninstnf:oai:brage.nina.no:11250/2580685 2023-05-15T14:30:06+02:00 Trophic ecology of piscivorous Arctic charr (Salvelinus alpinus (L.)) in subarctic lakes with contrasting food-web structures Kahilainen, Kimmo Kalevi Thomas, Stephen Harrod, Chris Hayden, Brian Eloranta, Antti 2018 application/octet-stream http://hdl.handle.net/11250/2580685 https://doi.org/10.1007/s10750-018-3845-z eng eng urn:issn:0018-8158 http://hdl.handle.net/11250/2580685 https://doi.org/10.1007/s10750-018-3845-z cristin:1638761 © Springer Nature Switzerland AG 2018 Hydrobiologia Diet Food-chain length Polymorphism Predation Stable isotopes VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 Journal article Peer reviewed 2018 ftninstnf https://doi.org/10.1007/s10750-018-3845-z 2021-12-23T07:17:16Z 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. acceptedVersion Article in Journal/Newspaper Arctic charr Arctic Fennoscandian Salvelinus alpinus Subarctic Norwegian Institute for Nature Research: Brage NINA Arctic Hydrobiologia 840 1 227 243 |
institution |
Open Polar |
collection |
Norwegian Institute for Nature Research: Brage NINA |
op_collection_id |
ftninstnf |
language |
English |
topic |
Diet Food-chain length Polymorphism Predation Stable isotopes VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 |
spellingShingle |
Diet Food-chain length Polymorphism Predation Stable isotopes VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 Kahilainen, Kimmo Kalevi Thomas, Stephen Harrod, Chris Hayden, Brian Eloranta, Antti Trophic ecology of piscivorous Arctic charr (Salvelinus alpinus (L.)) in subarctic lakes with contrasting food-web structures |
topic_facet |
Diet Food-chain length Polymorphism Predation Stable isotopes VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 |
description |
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. acceptedVersion |
format |
Article in Journal/Newspaper |
author |
Kahilainen, Kimmo Kalevi Thomas, Stephen Harrod, Chris Hayden, Brian Eloranta, Antti |
author_facet |
Kahilainen, Kimmo Kalevi Thomas, Stephen Harrod, Chris Hayden, Brian Eloranta, Antti |
author_sort |
Kahilainen, Kimmo Kalevi |
title |
Trophic ecology of piscivorous Arctic charr (Salvelinus alpinus (L.)) in subarctic lakes with contrasting food-web structures |
title_short |
Trophic ecology of piscivorous Arctic charr (Salvelinus alpinus (L.)) in subarctic lakes with contrasting food-web structures |
title_full |
Trophic ecology of piscivorous Arctic charr (Salvelinus alpinus (L.)) in subarctic lakes with contrasting food-web structures |
title_fullStr |
Trophic ecology of piscivorous Arctic charr (Salvelinus alpinus (L.)) in subarctic lakes with contrasting food-web structures |
title_full_unstemmed |
Trophic ecology of piscivorous Arctic charr (Salvelinus alpinus (L.)) in subarctic lakes with contrasting food-web structures |
title_sort |
trophic ecology of piscivorous arctic charr (salvelinus alpinus (l.)) in subarctic lakes with contrasting food-web structures |
publishDate |
2018 |
url |
http://hdl.handle.net/11250/2580685 https://doi.org/10.1007/s10750-018-3845-z |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic charr Arctic Fennoscandian Salvelinus alpinus Subarctic |
genre_facet |
Arctic charr Arctic Fennoscandian Salvelinus alpinus Subarctic |
op_source |
Hydrobiologia |
op_relation |
urn:issn:0018-8158 http://hdl.handle.net/11250/2580685 https://doi.org/10.1007/s10750-018-3845-z cristin:1638761 |
op_rights |
© Springer Nature Switzerland AG 2018 |
op_doi |
https://doi.org/10.1007/s10750-018-3845-z |
container_title |
Hydrobiologia |
container_volume |
840 |
container_issue |
1 |
container_start_page |
227 |
op_container_end_page |
243 |
_version_ |
1766304017144610816 |