Evidence for reduced genetic variation in severely deformed juvenile salmonids
Inbreeding is one of the factors that can result in high infant mortality. In many species, however, mortality at early life stages is very difficult to observe in the wild and estimates from later life stages may therefore underestimate the effects of reduced genetic variability on fitness. Using m...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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crcansciencepubl:10.1139/f06-154 2024-05-19T07:37:47+00:00 Evidence for reduced genetic variation in severely deformed juvenile salmonids Tiira, Katriina Piironen, Jorma Primmer, Craig R 2006 http://dx.doi.org/10.1139/f06-154 http://www.nrcresearchpress.com/doi/pdf/10.1139/f06-154 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 63, issue 12, page 2700-2707 ISSN 0706-652X 1205-7533 journal-article 2006 crcansciencepubl https://doi.org/10.1139/f06-154 2024-05-02T06:51:27Z Inbreeding is one of the factors that can result in high infant mortality. In many species, however, mortality at early life stages is very difficult to observe in the wild and estimates from later life stages may therefore underestimate the effects of reduced genetic variability on fitness. Using microsatellites, we compared the amount of genetic variation in severely deformed fry of Lake Saimaa salmon (Atlantic salmon, Salmo salar) and brown trout (Salmo trutta) hatchery brood stocks with normal fry from the same brood stocks. We observed significantly lower standardized heterozygosity and higher internal relatedness values for deformed fry of both species compared with normal fry. Our results suggest that (i) inbreeding can be an important factor causing severe deformities in juvenile salmonids and (ii) high mortality of severely deformed low heterozygosity individuals in early life stages may partly explain why some studies exploring heterozygosity–fitness correlations fail to find any association. An important direction for future research on this topic will be to compare the results of experiments conducted in captivity with those of similar experiments conducted in wild or semi-wild conditions, as such studies would help to better understand the direct relevance of research conducted in captivity with respect to the conservation of wild populations. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 63 12 2700 2707 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
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Inbreeding is one of the factors that can result in high infant mortality. In many species, however, mortality at early life stages is very difficult to observe in the wild and estimates from later life stages may therefore underestimate the effects of reduced genetic variability on fitness. Using microsatellites, we compared the amount of genetic variation in severely deformed fry of Lake Saimaa salmon (Atlantic salmon, Salmo salar) and brown trout (Salmo trutta) hatchery brood stocks with normal fry from the same brood stocks. We observed significantly lower standardized heterozygosity and higher internal relatedness values for deformed fry of both species compared with normal fry. Our results suggest that (i) inbreeding can be an important factor causing severe deformities in juvenile salmonids and (ii) high mortality of severely deformed low heterozygosity individuals in early life stages may partly explain why some studies exploring heterozygosity–fitness correlations fail to find any association. An important direction for future research on this topic will be to compare the results of experiments conducted in captivity with those of similar experiments conducted in wild or semi-wild conditions, as such studies would help to better understand the direct relevance of research conducted in captivity with respect to the conservation of wild populations. |
format |
Article in Journal/Newspaper |
author |
Tiira, Katriina Piironen, Jorma Primmer, Craig R |
spellingShingle |
Tiira, Katriina Piironen, Jorma Primmer, Craig R Evidence for reduced genetic variation in severely deformed juvenile salmonids |
author_facet |
Tiira, Katriina Piironen, Jorma Primmer, Craig R |
author_sort |
Tiira, Katriina |
title |
Evidence for reduced genetic variation in severely deformed juvenile salmonids |
title_short |
Evidence for reduced genetic variation in severely deformed juvenile salmonids |
title_full |
Evidence for reduced genetic variation in severely deformed juvenile salmonids |
title_fullStr |
Evidence for reduced genetic variation in severely deformed juvenile salmonids |
title_full_unstemmed |
Evidence for reduced genetic variation in severely deformed juvenile salmonids |
title_sort |
evidence for reduced genetic variation in severely deformed juvenile salmonids |
publisher |
Canadian Science Publishing |
publishDate |
2006 |
url |
http://dx.doi.org/10.1139/f06-154 http://www.nrcresearchpress.com/doi/pdf/10.1139/f06-154 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 63, issue 12, page 2700-2707 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f06-154 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
63 |
container_issue |
12 |
container_start_page |
2700 |
op_container_end_page |
2707 |
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1799477161491431424 |