Habitat and Food Segregation of Dwarf and Normal Arctic Charr ( Salvelinus alpinus ) from Vangsvatnet Lake, Western Norway
The aim of the present study was to test possible habitat and food segregation between two charr morphs in Vangsvatnet Lake. The charr population of Vangsvatnet consists of one pale phenotype with parr marks along the flanks and poorly developed spawning coloration (dwarf charr), and another phenoty...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
1982
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Online Access: | http://dx.doi.org/10.1139/f82-138 http://www.nrcresearchpress.com/doi/pdf/10.1139/f82-138 |
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crcansciencepubl:10.1139/f82-138 2023-12-17T10:23:46+01:00 Habitat and Food Segregation of Dwarf and Normal Arctic Charr ( Salvelinus alpinus ) from Vangsvatnet Lake, Western Norway Hindar, Kjetil Jonsson, Bror 1982 http://dx.doi.org/10.1139/f82-138 http://www.nrcresearchpress.com/doi/pdf/10.1139/f82-138 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 39, issue 7, page 1030-1045 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1982 crcansciencepubl https://doi.org/10.1139/f82-138 2023-11-19T13:39:10Z The aim of the present study was to test possible habitat and food segregation between two charr morphs in Vangsvatnet Lake. The charr population of Vangsvatnet consists of one pale phenotype with parr marks along the flanks and poorly developed spawning coloration (dwarf charr), and another phenotype with silvery flanks in nonbreeding condition and bright red spawning colors (normal charr). The habitus of the two morphs indicated that they were adapted to different niches during the growth season. The analyses of distribution and food showed that there was marked habitat and food segregation between the two morphs during summer, when dwarf charr dwelled deep-benthic and normal charr roamed in the limnetic zone. The segregation broke down in periods of food abundance, indicating that the habitat segregation was due to intraspecific competition for food. A comparison of charr morphs of Vangsvatnet with the nearby Lønavatnet Lake suggested that the number of charr morphs is adapted to local environmental conditions, among which lake morphology, food availability, and other fish species are important. We hypothesize that the number of charr morphs within a locality depends on the number of available niches during the growth season.Key words: polymorphism, camouflage, distribution, ontogeny, intra- and inter-specific competition Article in Journal/Newspaper Arctic charr Arctic Salvelinus alpinus Canadian Science Publishing (via Crossref) Arctic Norway Canadian Journal of Fisheries and Aquatic Sciences 39 7 1030 1045 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Hindar, Kjetil Jonsson, Bror Habitat and Food Segregation of Dwarf and Normal Arctic Charr ( Salvelinus alpinus ) from Vangsvatnet Lake, Western Norway |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
The aim of the present study was to test possible habitat and food segregation between two charr morphs in Vangsvatnet Lake. The charr population of Vangsvatnet consists of one pale phenotype with parr marks along the flanks and poorly developed spawning coloration (dwarf charr), and another phenotype with silvery flanks in nonbreeding condition and bright red spawning colors (normal charr). The habitus of the two morphs indicated that they were adapted to different niches during the growth season. The analyses of distribution and food showed that there was marked habitat and food segregation between the two morphs during summer, when dwarf charr dwelled deep-benthic and normal charr roamed in the limnetic zone. The segregation broke down in periods of food abundance, indicating that the habitat segregation was due to intraspecific competition for food. A comparison of charr morphs of Vangsvatnet with the nearby Lønavatnet Lake suggested that the number of charr morphs is adapted to local environmental conditions, among which lake morphology, food availability, and other fish species are important. We hypothesize that the number of charr morphs within a locality depends on the number of available niches during the growth season.Key words: polymorphism, camouflage, distribution, ontogeny, intra- and inter-specific competition |
format |
Article in Journal/Newspaper |
author |
Hindar, Kjetil Jonsson, Bror |
author_facet |
Hindar, Kjetil Jonsson, Bror |
author_sort |
Hindar, Kjetil |
title |
Habitat and Food Segregation of Dwarf and Normal Arctic Charr ( Salvelinus alpinus ) from Vangsvatnet Lake, Western Norway |
title_short |
Habitat and Food Segregation of Dwarf and Normal Arctic Charr ( Salvelinus alpinus ) from Vangsvatnet Lake, Western Norway |
title_full |
Habitat and Food Segregation of Dwarf and Normal Arctic Charr ( Salvelinus alpinus ) from Vangsvatnet Lake, Western Norway |
title_fullStr |
Habitat and Food Segregation of Dwarf and Normal Arctic Charr ( Salvelinus alpinus ) from Vangsvatnet Lake, Western Norway |
title_full_unstemmed |
Habitat and Food Segregation of Dwarf and Normal Arctic Charr ( Salvelinus alpinus ) from Vangsvatnet Lake, Western Norway |
title_sort |
habitat and food segregation of dwarf and normal arctic charr ( salvelinus alpinus ) from vangsvatnet lake, western norway |
publisher |
Canadian Science Publishing |
publishDate |
1982 |
url |
http://dx.doi.org/10.1139/f82-138 http://www.nrcresearchpress.com/doi/pdf/10.1139/f82-138 |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Arctic charr Arctic Salvelinus alpinus |
genre_facet |
Arctic charr Arctic Salvelinus alpinus |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 39, issue 7, page 1030-1045 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f82-138 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
39 |
container_issue |
7 |
container_start_page |
1030 |
op_container_end_page |
1045 |
_version_ |
1785560155931279360 |