Rapid evolution of muscle fibre number in post-glacial populations of Arctic charr Salvelinus alpinus
Thingvallavatn, the largest and one of the oldest lakes in Iceland, contains four morphs of Arctic charr Salvelinus alpinus. Dwarf benthic (DB), large benthic (LB), planktivorous (PL) and piscivorous (PI) morphs can be distinguished and differ markedly in head morphology, colouration and maximum for...
Published in: | Journal of Experimental Biology |
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2004
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/rapid-evolution-of-muscle-fibre-number-in-postglacial-populations-of-arctic-charr-salvelinus-alpinus(8cf054e0-5fdf-459d-88b9-c602517954da).html https://doi.org/10.1242/jeb.01292 http://www.scopus.com/inward/record.url?scp=11444265309&partnerID=8YFLogxK http://www.st-andrews.ac.uk/~fmrg/documents/254.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/8cf054e0-5fdf-459d-88b9-c602517954da 2024-06-23T07:48:24+00:00 Rapid evolution of muscle fibre number in post-glacial populations of Arctic charr Salvelinus alpinus Johnston, Ian Alistair Abercromby, M Vieira, VLA Sigursteindóttir, RJ Kristjánsson, BK Sibthorpe, D Skúlason, S 2004-12 https://research-portal.st-andrews.ac.uk/en/researchoutput/rapid-evolution-of-muscle-fibre-number-in-postglacial-populations-of-arctic-charr-salvelinus-alpinus(8cf054e0-5fdf-459d-88b9-c602517954da).html https://doi.org/10.1242/jeb.01292 http://www.scopus.com/inward/record.url?scp=11444265309&partnerID=8YFLogxK http://www.st-andrews.ac.uk/~fmrg/documents/254.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/rapid-evolution-of-muscle-fibre-number-in-postglacial-populations-of-arctic-charr-salvelinus-alpinus(8cf054e0-5fdf-459d-88b9-c602517954da).html info:eu-repo/semantics/restrictedAccess Johnston , I A , Abercromby , M , Vieira , VLA , Sigursteindóttir , RJ , Kristjánsson , BK , Sibthorpe , D & Skúlason , S 2004 , ' Rapid evolution of muscle fibre number in post-glacial populations of Arctic charr Salvelinus alpinus ' , Journal of Experimental Biology , vol. 207 , no. 25 , pp. 4343-4360 . https://doi.org/10.1242/jeb.01292 muscle fibres myogenesis growth myogenic progenitor cell resource polymorphism developmental plasticity fish Arctic charr myogenic regulatory factor paired box protein 7 forkhead box protein K1-alpha MYOGENIC SATELLITE CELLS TROUT SALMO-GAIRDNERI ATLANTIC-SALMON SKELETAL-MUSCLE RAINBOW-TROUT SYMPATRIC MORPHS WHITE MUSCLE STEM-CELLS CYPRINUS-CARPIO SEAWATER STAGES article 2004 ftunstandrewcris https://doi.org/10.1242/jeb.01292 2024-06-13T00:14:39Z Thingvallavatn, the largest and one of the oldest lakes in Iceland, contains four morphs of Arctic charr Salvelinus alpinus. Dwarf benthic (DB), large benthic (LB), planktivorous (PL) and piscivorous (PI) morphs can be distinguished and differ markedly in head morphology, colouration and maximum fork length (FLmax,), reflecting their different resource specialisations within the lake. The four morphs in Thingvallavatn are thought to have been isolated for approximately 10 000 years, since shortly after the end of the last Ice Age. We tested the null hypothesis that the pattern of muscle fibre recruitment was the same in all morphs, reflecting their recent diversification. The cross-sectional areas of fast and slow muscle fibres were measured at 0.7 FL in 46 DB morphs, 23 LB morphs, 24 PL morphs and 22 PI morphs, and the ages of the charr were estimated using sacculus otoliths. In fish larger than 10 g, the maximum fibre diameter scaled with body mass (M-b)(0.18) for both fibre types in all morphs. The number of myonuclei per cm fibre length increased with fibre diameter, but was similar between morphs. On average, at 60 pm diameter, there were 2264 nuclei cm(-1) in slow fibres and 1126 nuclei cm(-1) in fast fibres. The absence of fibres of diameter 4-10 mum was used to determine the FL at which muscle fibre recruitment stopped. Slow fibre number increased with body length in all morphs, scaling with b. In contrast, the recruitment of fast muscle fibres continued until a clearly identifiable FL, corresponding to 18-19 cm in the dwarf morph, 24-26 cm in the pelagic morph, 32-33 cm in the large benthic morph and 34-35 cm in the piscivorous morph. The maximum fast fibre number (FNmax) in the dwarf morph (6.97X 10(4)) was 56.5 % of-that found in the LB and PI morphs combined (1.23X10(5)) (P<0.001). Muscle fibre recruitment continued until a threshold body size and occurred at a range of ages, starting at 4+ years in the DB morph and 7+ years in the LB and PI morphs. Our null hypothesis was therefore rejected for ... Article in Journal/Newspaper Arctic Arctic charr Arctic Atlantic salmon Iceland Salvelinus alpinus University of St Andrews: Research Portal Arctic Journal of Experimental Biology 207 25 4343 4360 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
muscle fibres myogenesis growth myogenic progenitor cell resource polymorphism developmental plasticity fish Arctic charr myogenic regulatory factor paired box protein 7 forkhead box protein K1-alpha MYOGENIC SATELLITE CELLS TROUT SALMO-GAIRDNERI ATLANTIC-SALMON SKELETAL-MUSCLE RAINBOW-TROUT SYMPATRIC MORPHS WHITE MUSCLE STEM-CELLS CYPRINUS-CARPIO SEAWATER STAGES |
spellingShingle |
muscle fibres myogenesis growth myogenic progenitor cell resource polymorphism developmental plasticity fish Arctic charr myogenic regulatory factor paired box protein 7 forkhead box protein K1-alpha MYOGENIC SATELLITE CELLS TROUT SALMO-GAIRDNERI ATLANTIC-SALMON SKELETAL-MUSCLE RAINBOW-TROUT SYMPATRIC MORPHS WHITE MUSCLE STEM-CELLS CYPRINUS-CARPIO SEAWATER STAGES Johnston, Ian Alistair Abercromby, M Vieira, VLA Sigursteindóttir, RJ Kristjánsson, BK Sibthorpe, D Skúlason, S Rapid evolution of muscle fibre number in post-glacial populations of Arctic charr Salvelinus alpinus |
topic_facet |
muscle fibres myogenesis growth myogenic progenitor cell resource polymorphism developmental plasticity fish Arctic charr myogenic regulatory factor paired box protein 7 forkhead box protein K1-alpha MYOGENIC SATELLITE CELLS TROUT SALMO-GAIRDNERI ATLANTIC-SALMON SKELETAL-MUSCLE RAINBOW-TROUT SYMPATRIC MORPHS WHITE MUSCLE STEM-CELLS CYPRINUS-CARPIO SEAWATER STAGES |
description |
Thingvallavatn, the largest and one of the oldest lakes in Iceland, contains four morphs of Arctic charr Salvelinus alpinus. Dwarf benthic (DB), large benthic (LB), planktivorous (PL) and piscivorous (PI) morphs can be distinguished and differ markedly in head morphology, colouration and maximum fork length (FLmax,), reflecting their different resource specialisations within the lake. The four morphs in Thingvallavatn are thought to have been isolated for approximately 10 000 years, since shortly after the end of the last Ice Age. We tested the null hypothesis that the pattern of muscle fibre recruitment was the same in all morphs, reflecting their recent diversification. The cross-sectional areas of fast and slow muscle fibres were measured at 0.7 FL in 46 DB morphs, 23 LB morphs, 24 PL morphs and 22 PI morphs, and the ages of the charr were estimated using sacculus otoliths. In fish larger than 10 g, the maximum fibre diameter scaled with body mass (M-b)(0.18) for both fibre types in all morphs. The number of myonuclei per cm fibre length increased with fibre diameter, but was similar between morphs. On average, at 60 pm diameter, there were 2264 nuclei cm(-1) in slow fibres and 1126 nuclei cm(-1) in fast fibres. The absence of fibres of diameter 4-10 mum was used to determine the FL at which muscle fibre recruitment stopped. Slow fibre number increased with body length in all morphs, scaling with b. In contrast, the recruitment of fast muscle fibres continued until a clearly identifiable FL, corresponding to 18-19 cm in the dwarf morph, 24-26 cm in the pelagic morph, 32-33 cm in the large benthic morph and 34-35 cm in the piscivorous morph. The maximum fast fibre number (FNmax) in the dwarf morph (6.97X 10(4)) was 56.5 % of-that found in the LB and PI morphs combined (1.23X10(5)) (P<0.001). Muscle fibre recruitment continued until a threshold body size and occurred at a range of ages, starting at 4+ years in the DB morph and 7+ years in the LB and PI morphs. Our null hypothesis was therefore rejected for ... |
format |
Article in Journal/Newspaper |
author |
Johnston, Ian Alistair Abercromby, M Vieira, VLA Sigursteindóttir, RJ Kristjánsson, BK Sibthorpe, D Skúlason, S |
author_facet |
Johnston, Ian Alistair Abercromby, M Vieira, VLA Sigursteindóttir, RJ Kristjánsson, BK Sibthorpe, D Skúlason, S |
author_sort |
Johnston, Ian Alistair |
title |
Rapid evolution of muscle fibre number in post-glacial populations of Arctic charr Salvelinus alpinus |
title_short |
Rapid evolution of muscle fibre number in post-glacial populations of Arctic charr Salvelinus alpinus |
title_full |
Rapid evolution of muscle fibre number in post-glacial populations of Arctic charr Salvelinus alpinus |
title_fullStr |
Rapid evolution of muscle fibre number in post-glacial populations of Arctic charr Salvelinus alpinus |
title_full_unstemmed |
Rapid evolution of muscle fibre number in post-glacial populations of Arctic charr Salvelinus alpinus |
title_sort |
rapid evolution of muscle fibre number in post-glacial populations of arctic charr salvelinus alpinus |
publishDate |
2004 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/rapid-evolution-of-muscle-fibre-number-in-postglacial-populations-of-arctic-charr-salvelinus-alpinus(8cf054e0-5fdf-459d-88b9-c602517954da).html https://doi.org/10.1242/jeb.01292 http://www.scopus.com/inward/record.url?scp=11444265309&partnerID=8YFLogxK http://www.st-andrews.ac.uk/~fmrg/documents/254.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic charr Arctic Atlantic salmon Iceland Salvelinus alpinus |
genre_facet |
Arctic Arctic charr Arctic Atlantic salmon Iceland Salvelinus alpinus |
op_source |
Johnston , I A , Abercromby , M , Vieira , VLA , Sigursteindóttir , RJ , Kristjánsson , BK , Sibthorpe , D & Skúlason , S 2004 , ' Rapid evolution of muscle fibre number in post-glacial populations of Arctic charr Salvelinus alpinus ' , Journal of Experimental Biology , vol. 207 , no. 25 , pp. 4343-4360 . https://doi.org/10.1242/jeb.01292 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/rapid-evolution-of-muscle-fibre-number-in-postglacial-populations-of-arctic-charr-salvelinus-alpinus(8cf054e0-5fdf-459d-88b9-c602517954da).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1242/jeb.01292 |
container_title |
Journal of Experimental Biology |
container_volume |
207 |
container_issue |
25 |
container_start_page |
4343 |
op_container_end_page |
4360 |
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1802638810613284864 |