Genetic heterogeneity of Atlantic bluefin tuna caught in the eastern North Atlantic Ocean south of Iceland
Abstract Atlantic bluefin tuna (Thunnus thynnus) are currently managed by the member nations of the International Commission for the Conservation of Atlantic Tunas (ICCAT) as distinct western and eastern stocks, separated by the 45°W meridian. Previous studies of Atlantic bluefin tuna caught in the...
Published in: | ICES Journal of Marine Science |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Oxford University Press (OUP)
2006
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1016/j.icesjms.2006.04.009 http://academic.oup.com/icesjms/article-pdf/63/6/1111/29126340/63-6-1111.pdf |
id |
croxfordunivpr:10.1016/j.icesjms.2006.04.009 |
---|---|
record_format |
openpolar |
spelling |
croxfordunivpr:10.1016/j.icesjms.2006.04.009 2023-11-12T04:19:08+01:00 Genetic heterogeneity of Atlantic bluefin tuna caught in the eastern North Atlantic Ocean south of Iceland Carlsson, Jens McDowell, Jan R. Carlsson, Jeanette E.L. Ólafsdóttir, Droplaug Graves, John E. 2006 http://dx.doi.org/10.1016/j.icesjms.2006.04.009 http://academic.oup.com/icesjms/article-pdf/63/6/1111/29126340/63-6-1111.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 63, issue 6, page 1111-1117 ISSN 1095-9289 1054-3139 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2006 croxfordunivpr https://doi.org/10.1016/j.icesjms.2006.04.009 2023-10-13T10:49:23Z Abstract Atlantic bluefin tuna (Thunnus thynnus) are currently managed by the member nations of the International Commission for the Conservation of Atlantic Tunas (ICCAT) as distinct western and eastern stocks, separated by the 45°W meridian. Previous studies of Atlantic bluefin tuna caught in the northeast Atlantic south of Norway suggested mixing of putative stocks in the region, based on abrupt shifts in the size and condition of fish during the fishing season. By contrast, more recent studies south of Iceland reported only small differences in size of tuna caught at different times of the season in that area. To better understand the stock structure and composition of Atlantic bluefin tuna in the region, we surveyed genetic variation at eight microsatellite loci for 800 Atlantic bluefin tuna collected in experimental commercial fishing operations south of Iceland during 1999 and 2002. We tested for heterogeneity between years, between seasons within a year, between two fishing areas within the region, and between sexes. Analysis of molecular variation demonstrated slight, but significant, genetic divergence between collections of fish caught early and late in the season over the two years. These results are consistent with prior observations of Atlantic bluefin tuna of different conditions entering the fishery through the season, and suggest that the northeast Atlantic fishery represents a mixed-stock fishery including animals migrating from different areas and recruited from different spawning grounds. Article in Journal/Newspaper Iceland North Atlantic Northeast Atlantic Oxford University Press (via Crossref) Norway ICES Journal of Marine Science 63 6 1111 1117 |
institution |
Open Polar |
collection |
Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography Carlsson, Jens McDowell, Jan R. Carlsson, Jeanette E.L. Ólafsdóttir, Droplaug Graves, John E. Genetic heterogeneity of Atlantic bluefin tuna caught in the eastern North Atlantic Ocean south of Iceland |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Atlantic bluefin tuna (Thunnus thynnus) are currently managed by the member nations of the International Commission for the Conservation of Atlantic Tunas (ICCAT) as distinct western and eastern stocks, separated by the 45°W meridian. Previous studies of Atlantic bluefin tuna caught in the northeast Atlantic south of Norway suggested mixing of putative stocks in the region, based on abrupt shifts in the size and condition of fish during the fishing season. By contrast, more recent studies south of Iceland reported only small differences in size of tuna caught at different times of the season in that area. To better understand the stock structure and composition of Atlantic bluefin tuna in the region, we surveyed genetic variation at eight microsatellite loci for 800 Atlantic bluefin tuna collected in experimental commercial fishing operations south of Iceland during 1999 and 2002. We tested for heterogeneity between years, between seasons within a year, between two fishing areas within the region, and between sexes. Analysis of molecular variation demonstrated slight, but significant, genetic divergence between collections of fish caught early and late in the season over the two years. These results are consistent with prior observations of Atlantic bluefin tuna of different conditions entering the fishery through the season, and suggest that the northeast Atlantic fishery represents a mixed-stock fishery including animals migrating from different areas and recruited from different spawning grounds. |
format |
Article in Journal/Newspaper |
author |
Carlsson, Jens McDowell, Jan R. Carlsson, Jeanette E.L. Ólafsdóttir, Droplaug Graves, John E. |
author_facet |
Carlsson, Jens McDowell, Jan R. Carlsson, Jeanette E.L. Ólafsdóttir, Droplaug Graves, John E. |
author_sort |
Carlsson, Jens |
title |
Genetic heterogeneity of Atlantic bluefin tuna caught in the eastern North Atlantic Ocean south of Iceland |
title_short |
Genetic heterogeneity of Atlantic bluefin tuna caught in the eastern North Atlantic Ocean south of Iceland |
title_full |
Genetic heterogeneity of Atlantic bluefin tuna caught in the eastern North Atlantic Ocean south of Iceland |
title_fullStr |
Genetic heterogeneity of Atlantic bluefin tuna caught in the eastern North Atlantic Ocean south of Iceland |
title_full_unstemmed |
Genetic heterogeneity of Atlantic bluefin tuna caught in the eastern North Atlantic Ocean south of Iceland |
title_sort |
genetic heterogeneity of atlantic bluefin tuna caught in the eastern north atlantic ocean south of iceland |
publisher |
Oxford University Press (OUP) |
publishDate |
2006 |
url |
http://dx.doi.org/10.1016/j.icesjms.2006.04.009 http://academic.oup.com/icesjms/article-pdf/63/6/1111/29126340/63-6-1111.pdf |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Iceland North Atlantic Northeast Atlantic |
genre_facet |
Iceland North Atlantic Northeast Atlantic |
op_source |
ICES Journal of Marine Science volume 63, issue 6, page 1111-1117 ISSN 1095-9289 1054-3139 |
op_doi |
https://doi.org/10.1016/j.icesjms.2006.04.009 |
container_title |
ICES Journal of Marine Science |
container_volume |
63 |
container_issue |
6 |
container_start_page |
1111 |
op_container_end_page |
1117 |
_version_ |
1782335635896401920 |