State‐dependent feed acquisition among two strains of hatchery‐reared Arctic charr
The effects of genetic and environmental factors on aggression and feeding hierarchies were studied using X‐radiography to measure food intake by hatchery‐reared individuals of two strains (Hammerfest and Svalbard) of Arctic charr Salvelinus alpinus . A reduction in food rations and/or water current...
Published in: | Journal of Fish Biology |
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Language: | English |
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Online Access: | http://dx.doi.org/10.1111/j.1095-8649.1997.tb01978.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1997.tb01978.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1997.tb01978.x |
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crwiley:10.1111/j.1095-8649.1997.tb01978.x 2024-06-02T08:00:04+00:00 State‐dependent feed acquisition among two strains of hatchery‐reared Arctic charr Damsgård, B. Arnesen, A. M. Baardvik, B. M. Jobling, M. 1997 http://dx.doi.org/10.1111/j.1095-8649.1997.tb01978.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1997.tb01978.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1997.tb01978.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 50, issue 4, page 859-869 ISSN 0022-1112 1095-8649 journal-article 1997 crwiley https://doi.org/10.1111/j.1095-8649.1997.tb01978.x 2024-05-03T11:31:50Z The effects of genetic and environmental factors on aggression and feeding hierarchies were studied using X‐radiography to measure food intake by hatchery‐reared individuals of two strains (Hammerfest and Svalbard) of Arctic charr Salvelinus alpinus . A reduction in food rations and/or water current speed increased intraspecific aggression, and both factors led to increased interindividual variability in food intake, increasing the coefficient of variation (CV). Following a return to pre‐manipulation conditions, CVs decreased to their original level. In control groups, CVs and share of group meals were stable throughout the experiment. The increase in CVs following manipulation was the result of a small number of dominant individuals obtaining a high share of the meal. Restriction in food ration affected share of meals, specific growth rates and the frequencies of non‐feeding fish, while reductions in water current speed affected only share of meals. Feeding hierarchies were size‐dependent in the control groups. In contrast, no relationships between body weight and feeding rank were evident in groups in which food ration or water current speed were reduced. A small, but consistent, difference was revealed in feeding hierarchy responses between the two strains. Article in Journal/Newspaper Arctic charr Arctic Hammerfest Salvelinus alpinus Svalbard Wiley Online Library Arctic Svalbard Journal of Fish Biology 50 4 859 869 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
The effects of genetic and environmental factors on aggression and feeding hierarchies were studied using X‐radiography to measure food intake by hatchery‐reared individuals of two strains (Hammerfest and Svalbard) of Arctic charr Salvelinus alpinus . A reduction in food rations and/or water current speed increased intraspecific aggression, and both factors led to increased interindividual variability in food intake, increasing the coefficient of variation (CV). Following a return to pre‐manipulation conditions, CVs decreased to their original level. In control groups, CVs and share of group meals were stable throughout the experiment. The increase in CVs following manipulation was the result of a small number of dominant individuals obtaining a high share of the meal. Restriction in food ration affected share of meals, specific growth rates and the frequencies of non‐feeding fish, while reductions in water current speed affected only share of meals. Feeding hierarchies were size‐dependent in the control groups. In contrast, no relationships between body weight and feeding rank were evident in groups in which food ration or water current speed were reduced. A small, but consistent, difference was revealed in feeding hierarchy responses between the two strains. |
format |
Article in Journal/Newspaper |
author |
Damsgård, B. Arnesen, A. M. Baardvik, B. M. Jobling, M. |
spellingShingle |
Damsgård, B. Arnesen, A. M. Baardvik, B. M. Jobling, M. State‐dependent feed acquisition among two strains of hatchery‐reared Arctic charr |
author_facet |
Damsgård, B. Arnesen, A. M. Baardvik, B. M. Jobling, M. |
author_sort |
Damsgård, B. |
title |
State‐dependent feed acquisition among two strains of hatchery‐reared Arctic charr |
title_short |
State‐dependent feed acquisition among two strains of hatchery‐reared Arctic charr |
title_full |
State‐dependent feed acquisition among two strains of hatchery‐reared Arctic charr |
title_fullStr |
State‐dependent feed acquisition among two strains of hatchery‐reared Arctic charr |
title_full_unstemmed |
State‐dependent feed acquisition among two strains of hatchery‐reared Arctic charr |
title_sort |
state‐dependent feed acquisition among two strains of hatchery‐reared arctic charr |
publisher |
Wiley |
publishDate |
1997 |
url |
http://dx.doi.org/10.1111/j.1095-8649.1997.tb01978.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1997.tb01978.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1997.tb01978.x |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic charr Arctic Hammerfest Salvelinus alpinus Svalbard |
genre_facet |
Arctic charr Arctic Hammerfest Salvelinus alpinus Svalbard |
op_source |
Journal of Fish Biology volume 50, issue 4, page 859-869 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.1997.tb01978.x |
container_title |
Journal of Fish Biology |
container_volume |
50 |
container_issue |
4 |
container_start_page |
859 |
op_container_end_page |
869 |
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1800744092925165568 |