Solution to the "Char Problem" based on Arctic Char ( Salvelinus alpinus) in Norway
Rearing and transplantation experiments demonstrate that three coexisting forms of Arctic char Salvelinus alpinus (anadromous, small and large freshwater residents) belong to the same gene pool. The parr of each form segregate into all three forms. Single individuals may manifest all three forms dur...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Canadian Science Publishing
1983
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Online Access: | http://dx.doi.org/10.1139/f83-159 http://www.nrcresearchpress.com/doi/pdf/10.1139/f83-159 |
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crcansciencepubl:10.1139/f83-159 2024-09-15T18:33:06+00:00 Solution to the "Char Problem" based on Arctic Char ( Salvelinus alpinus) in Norway Nordeng, Hans 1983 http://dx.doi.org/10.1139/f83-159 http://www.nrcresearchpress.com/doi/pdf/10.1139/f83-159 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 40, issue 9, page 1372-1387 ISSN 0706-652X 1205-7533 journal-article 1983 crcansciencepubl https://doi.org/10.1139/f83-159 2024-08-15T04:09:30Z Rearing and transplantation experiments demonstrate that three coexisting forms of Arctic char Salvelinus alpinus (anadromous, small and large freshwater residents) belong to the same gene pool. The parr of each form segregate into all three forms. Single individuals may manifest all three forms during their lifetime, successively attaining the appearance and spawning color of each form. Males mature at a younger age and smaller size than females. Hence, in char populations featuring two or more forms, males dominate in the early maturing form and females in the late maturing form. Char populations that feature only one form (sex ratio 1:1) seem to be established through natural selection for age at sexual maturity. Segregation during the young stage depends upon their genetic constitution and access to food. Offspring of the small resident parents produced more resident individuals and fewer smolts than did offspring of anadromous parents. An increased amount of food increases the resident fraction and reduces the fraction of anadromous char. It is demonstrated that the potential for anadromy exists in populations of char in the southern nonanadromous area, and that one reason for resident behavior in the smolt may be infection of the ureter fluke Phyllodistomum conostomum Olsson. Article in Journal/Newspaper Salvelinus alpinus Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 40 9 1372 1387 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
description |
Rearing and transplantation experiments demonstrate that three coexisting forms of Arctic char Salvelinus alpinus (anadromous, small and large freshwater residents) belong to the same gene pool. The parr of each form segregate into all three forms. Single individuals may manifest all three forms during their lifetime, successively attaining the appearance and spawning color of each form. Males mature at a younger age and smaller size than females. Hence, in char populations featuring two or more forms, males dominate in the early maturing form and females in the late maturing form. Char populations that feature only one form (sex ratio 1:1) seem to be established through natural selection for age at sexual maturity. Segregation during the young stage depends upon their genetic constitution and access to food. Offspring of the small resident parents produced more resident individuals and fewer smolts than did offspring of anadromous parents. An increased amount of food increases the resident fraction and reduces the fraction of anadromous char. It is demonstrated that the potential for anadromy exists in populations of char in the southern nonanadromous area, and that one reason for resident behavior in the smolt may be infection of the ureter fluke Phyllodistomum conostomum Olsson. |
format |
Article in Journal/Newspaper |
author |
Nordeng, Hans |
spellingShingle |
Nordeng, Hans Solution to the "Char Problem" based on Arctic Char ( Salvelinus alpinus) in Norway |
author_facet |
Nordeng, Hans |
author_sort |
Nordeng, Hans |
title |
Solution to the "Char Problem" based on Arctic Char ( Salvelinus alpinus) in Norway |
title_short |
Solution to the "Char Problem" based on Arctic Char ( Salvelinus alpinus) in Norway |
title_full |
Solution to the "Char Problem" based on Arctic Char ( Salvelinus alpinus) in Norway |
title_fullStr |
Solution to the "Char Problem" based on Arctic Char ( Salvelinus alpinus) in Norway |
title_full_unstemmed |
Solution to the "Char Problem" based on Arctic Char ( Salvelinus alpinus) in Norway |
title_sort |
solution to the "char problem" based on arctic char ( salvelinus alpinus) in norway |
publisher |
Canadian Science Publishing |
publishDate |
1983 |
url |
http://dx.doi.org/10.1139/f83-159 http://www.nrcresearchpress.com/doi/pdf/10.1139/f83-159 |
genre |
Salvelinus alpinus |
genre_facet |
Salvelinus alpinus |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 40, issue 9, page 1372-1387 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f83-159 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
40 |
container_issue |
9 |
container_start_page |
1372 |
op_container_end_page |
1387 |
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1810474841581551616 |