Extreme male-skewed sex ratios on spaning grounds for Atlantic cod Gadus morhua with typical coastal cod signatures of the Pan I (pantophysin) locus
Published version. Source at http://doi.org/10.3354/sedao00013 . Large offshore and small inshore populations of Atlantic cod Gadus morhua L. display differences in migratory patterns and settling regimes, but little is known about possible differences in spawning behaviour. Cod presumably of the No...
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2015
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Online Access: | https://hdl.handle.net/10037/8749 https://doi.org/10.3354/sedao00013 |
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ftunivtroemsoe:oai:munin.uit.no:10037/8749 2023-05-15T14:30:32+02:00 Extreme male-skewed sex ratios on spaning grounds for Atlantic cod Gadus morhua with typical coastal cod signatures of the Pan I (pantophysin) locus Fevolden, Svein-Erik Westgaard, Jon-Ivar Pedersen, Torstein 2015 https://hdl.handle.net/10037/8749 https://doi.org/10.3354/sedao00013 eng eng Inter-Research Sexuality and Early Development in Aquatic Organisms 2015(1):133-142 FRIDAID 1262027 doi:10.3354/sedao00013 2195-2744 https://hdl.handle.net/10037/8749 URN:NBN:no-uit_munin_8319 openAccess Atlantic cod Norwegian coastal cod Spawning behavior Sex ratio Pantophysin Pan I locus VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 Journal article Tidsskriftartikkel Peer reviewed 2015 ftunivtroemsoe https://doi.org/10.3354/sedao00013 2021-06-25T17:54:35Z Published version. Source at http://doi.org/10.3354/sedao00013 . Large offshore and small inshore populations of Atlantic cod Gadus morhua L. display differences in migratory patterns and settling regimes, but little is known about possible differences in spawning behaviour. Cod presumably of the Norwegian coastal cod type were therefore sampled during 7 spawning seasons (2002-2013) in Malangen, northern Norway. A spawning site in neighbouring Balsfjord was sampled during 5 consecutive spawning seasons (2002-2006). Length, weight, sex and maturity stage were recorded for each individual fish (n = 995). To verify their population assignment, frequencies of the 2 different Pan I (pantophysin) alleles were measured in 6 sampling years in Malangen and 3 in Balsfjord (n = 728). During all survey years there was an extreme skewed sex ratio at the spawning sites. In 6 of 7 seasons in Malangen, 8–9 of 10 fish were males, and in Balsfjord 9 of 10 fish were males on average, indicating some form of lekking behaviour among the spawning fish. Average size of the fish varied among years and also between sexes in individual years, although not consistently. The smallest proportion of mature fish was seen in Malangen in the year with the earliest sampling date (23 February). This was also the sample with the least skewed sex ratio (6.5 of 10 fish were males). The frequency of the Pan IA allele of the Malangen cod was highly stable among years at close to 90%, showing that this spawning ground is exclusively used by coastal cod. In Balsfjord, frequencies of the Pan IA allele were lower (67-78%). This fjord is suggested to be more penetrable for the migratory NE Arctic cod with their high frequencies of the Pan IB allele, making it a less exclusively coastal cod residence. In both fjords, length of mature males but not females varied among the Pan I genotypes. Article in Journal/Newspaper Arctic cod Arctic atlantic cod Balsfjord Gadus morhua Malangen Northern Norway University of Tromsø: Munin Open Research Archive Arctic Norway Balsfjord ENVELOPE(19.227,19.227,69.240,69.240) Malangen ENVELOPE(18.598,18.598,69.400,69.400) Sexuality and Early Development in Aquatic Organisms 1 2 133 142 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
Atlantic cod Norwegian coastal cod Spawning behavior Sex ratio Pantophysin Pan I locus VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 |
spellingShingle |
Atlantic cod Norwegian coastal cod Spawning behavior Sex ratio Pantophysin Pan I locus VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 Fevolden, Svein-Erik Westgaard, Jon-Ivar Pedersen, Torstein Extreme male-skewed sex ratios on spaning grounds for Atlantic cod Gadus morhua with typical coastal cod signatures of the Pan I (pantophysin) locus |
topic_facet |
Atlantic cod Norwegian coastal cod Spawning behavior Sex ratio Pantophysin Pan I locus VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 |
description |
Published version. Source at http://doi.org/10.3354/sedao00013 . Large offshore and small inshore populations of Atlantic cod Gadus morhua L. display differences in migratory patterns and settling regimes, but little is known about possible differences in spawning behaviour. Cod presumably of the Norwegian coastal cod type were therefore sampled during 7 spawning seasons (2002-2013) in Malangen, northern Norway. A spawning site in neighbouring Balsfjord was sampled during 5 consecutive spawning seasons (2002-2006). Length, weight, sex and maturity stage were recorded for each individual fish (n = 995). To verify their population assignment, frequencies of the 2 different Pan I (pantophysin) alleles were measured in 6 sampling years in Malangen and 3 in Balsfjord (n = 728). During all survey years there was an extreme skewed sex ratio at the spawning sites. In 6 of 7 seasons in Malangen, 8–9 of 10 fish were males, and in Balsfjord 9 of 10 fish were males on average, indicating some form of lekking behaviour among the spawning fish. Average size of the fish varied among years and also between sexes in individual years, although not consistently. The smallest proportion of mature fish was seen in Malangen in the year with the earliest sampling date (23 February). This was also the sample with the least skewed sex ratio (6.5 of 10 fish were males). The frequency of the Pan IA allele of the Malangen cod was highly stable among years at close to 90%, showing that this spawning ground is exclusively used by coastal cod. In Balsfjord, frequencies of the Pan IA allele were lower (67-78%). This fjord is suggested to be more penetrable for the migratory NE Arctic cod with their high frequencies of the Pan IB allele, making it a less exclusively coastal cod residence. In both fjords, length of mature males but not females varied among the Pan I genotypes. |
format |
Article in Journal/Newspaper |
author |
Fevolden, Svein-Erik Westgaard, Jon-Ivar Pedersen, Torstein |
author_facet |
Fevolden, Svein-Erik Westgaard, Jon-Ivar Pedersen, Torstein |
author_sort |
Fevolden, Svein-Erik |
title |
Extreme male-skewed sex ratios on spaning grounds for Atlantic cod Gadus morhua with typical coastal cod signatures of the Pan I (pantophysin) locus |
title_short |
Extreme male-skewed sex ratios on spaning grounds for Atlantic cod Gadus morhua with typical coastal cod signatures of the Pan I (pantophysin) locus |
title_full |
Extreme male-skewed sex ratios on spaning grounds for Atlantic cod Gadus morhua with typical coastal cod signatures of the Pan I (pantophysin) locus |
title_fullStr |
Extreme male-skewed sex ratios on spaning grounds for Atlantic cod Gadus morhua with typical coastal cod signatures of the Pan I (pantophysin) locus |
title_full_unstemmed |
Extreme male-skewed sex ratios on spaning grounds for Atlantic cod Gadus morhua with typical coastal cod signatures of the Pan I (pantophysin) locus |
title_sort |
extreme male-skewed sex ratios on spaning grounds for atlantic cod gadus morhua with typical coastal cod signatures of the pan i (pantophysin) locus |
publisher |
Inter-Research |
publishDate |
2015 |
url |
https://hdl.handle.net/10037/8749 https://doi.org/10.3354/sedao00013 |
long_lat |
ENVELOPE(19.227,19.227,69.240,69.240) ENVELOPE(18.598,18.598,69.400,69.400) |
geographic |
Arctic Norway Balsfjord Malangen |
geographic_facet |
Arctic Norway Balsfjord Malangen |
genre |
Arctic cod Arctic atlantic cod Balsfjord Gadus morhua Malangen Northern Norway |
genre_facet |
Arctic cod Arctic atlantic cod Balsfjord Gadus morhua Malangen Northern Norway |
op_relation |
Sexuality and Early Development in Aquatic Organisms 2015(1):133-142 FRIDAID 1262027 doi:10.3354/sedao00013 2195-2744 https://hdl.handle.net/10037/8749 URN:NBN:no-uit_munin_8319 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.3354/sedao00013 |
container_title |
Sexuality and Early Development in Aquatic Organisms |
container_volume |
1 |
container_issue |
2 |
container_start_page |
133 |
op_container_end_page |
142 |
_version_ |
1766304367994994688 |