Investigation of the Stock Structure of Atlantic Walrus (Odobenus rosmarus rosmarus) in Canada and Greenland Using Dental Pb Isotopes Derived from Local Geochemical Environments
The chemical composition of animal tissues such as teeth appears to reflect an individual's exposure to its geochemical environment. In this study, the lead (Pb) isotope composition of dental cementum was used to investigate the stock structure of Atlantic walrus (Odobenus rosmarus rosmarus) in...
Published in: | ARCTIC |
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Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
The Arctic Institute of North America
2003
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Subjects: | |
Online Access: | https://journalhosting.ucalgary.ca/index.php/arctic/article/view/63664 |
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University of Calgary Journal Hosting |
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English |
topic |
walrus Odobenus rosmarus rosmarus teeth lead isotopes stock discrimination morse dents isotopes du plomb discrimination des stocks |
spellingShingle |
walrus Odobenus rosmarus rosmarus teeth lead isotopes stock discrimination morse dents isotopes du plomb discrimination des stocks Outridge, P.M. Davis, W.J. Stewart, R.E.A. Born, E.W. Investigation of the Stock Structure of Atlantic Walrus (Odobenus rosmarus rosmarus) in Canada and Greenland Using Dental Pb Isotopes Derived from Local Geochemical Environments |
topic_facet |
walrus Odobenus rosmarus rosmarus teeth lead isotopes stock discrimination morse dents isotopes du plomb discrimination des stocks |
description |
The chemical composition of animal tissues such as teeth appears to reflect an individual's exposure to its geochemical environment. In this study, the lead (Pb) isotope composition of dental cementum was used to investigate the stock structure of Atlantic walrus (Odobenus rosmarus rosmarus) in the Canadian Arctic and Greenland. The 12 communities providing walrus samples for this study represent most of the Canadian and Greenlandic villages where walrus still form an important part of the traditional Inuit diet. Significant differences between locations in mean Pb isotope ratios and the limited overlap of the ranges of values indicate that each village harvested walrus herds that exploited substantially different geological/geographical habitats. This geographic segregation based on isotopic signatures suggests that most walrus stocks (i.e., the groups of walrus that interact with hunters at each community) are more localized in their range than previously thought. 208Pb/207Pb and 208Pb/204Pb were the most important stock discriminators, reflecting the influence of local geological Th/U composition (i.e., 208Pb) on Pb isotope composition in walrus teeth. 204Pb-based isotope ratios in walrus were consistently higher (more radiogenic) and more homogeneous than those in regional terrestrial bedrock, a difference probably due to selective leaching of radiogenic Pb from mineral phases into seawater and mixing during weathering and transport. Dental Pb isotope signatures may have widespread application to stock discrimination of other coastal marine mammal species. La composition chimique de tissus animaux tels que les dents semble refléter l'exposition d'un individu à son milieu géochimique. Pour la présente étude, on a utilisé la composition isotopique du plomb (Pb) contenu dans le cément pour examiner la structure du stock du morse de l'Atlantique (Odobenus rosmarus rosmarus) dans l'Arctique canadien et le Groenland. Les 12 communautés qui ont fourni les échantillons de morse pour ce projet représentent la majorité des villages canadiens et groenlandais où le morse constitue toujours une grande partie du régime alimentaire traditionnel des Inuits. Des différences marquées entre les sites dans la moyenne des rapports isotopiques du Pb et le faible recoupement des gammes de valeurs révèlent que chaque village prélevait des morses au sein de troupeaux qui exploitaient des habitats géologiques/géographiques bien distincts. Cette ségrégation géographique fondée sur des signatures isotopiques suggère que la plupart des stocks de morses (c.-à-d. le groupe de morses qui interagit avec les chasseurs dans chaque communauté) sont plus localisés dans leur territoire qu'on ne le pensait auparavant. 208Pb/207Pb et 208Pb/204Pb étaient les grands caractères discriminants des stocks, reflétant l'influence de la composition géologique locale Th/U (c-à-d. 208Pb) sur la composition isotopique du Pb dans les dents du morse. Les rapports isotopiques fondés sur 204Pb étaient constamment plus élevés (plus radiogéniques) et plus homogènes que ceux du substratum terrestre, la différence étant probablement due à la lixiviation sélective du Pb radiogénique passant des phases minérales dans l'eau de mer et à son mélange durant la météorisation et le transport. Les signatures isotopiques du plomb dentaire peuvent avoir de vastes applications dans la discrimination des stocks d'autres espèces de mammifères marins côtiers. |
format |
Article in Journal/Newspaper |
author |
Outridge, P.M. Davis, W.J. Stewart, R.E.A. Born, E.W. |
author_facet |
Outridge, P.M. Davis, W.J. Stewart, R.E.A. Born, E.W. |
author_sort |
Outridge, P.M. |
title |
Investigation of the Stock Structure of Atlantic Walrus (Odobenus rosmarus rosmarus) in Canada and Greenland Using Dental Pb Isotopes Derived from Local Geochemical Environments |
title_short |
Investigation of the Stock Structure of Atlantic Walrus (Odobenus rosmarus rosmarus) in Canada and Greenland Using Dental Pb Isotopes Derived from Local Geochemical Environments |
title_full |
Investigation of the Stock Structure of Atlantic Walrus (Odobenus rosmarus rosmarus) in Canada and Greenland Using Dental Pb Isotopes Derived from Local Geochemical Environments |
title_fullStr |
Investigation of the Stock Structure of Atlantic Walrus (Odobenus rosmarus rosmarus) in Canada and Greenland Using Dental Pb Isotopes Derived from Local Geochemical Environments |
title_full_unstemmed |
Investigation of the Stock Structure of Atlantic Walrus (Odobenus rosmarus rosmarus) in Canada and Greenland Using Dental Pb Isotopes Derived from Local Geochemical Environments |
title_sort |
investigation of the stock structure of atlantic walrus (odobenus rosmarus rosmarus) in canada and greenland using dental pb isotopes derived from local geochemical environments |
publisher |
The Arctic Institute of North America |
publishDate |
2003 |
url |
https://journalhosting.ucalgary.ca/index.php/arctic/article/view/63664 |
long_lat |
ENVELOPE(-70.967,-70.967,-68.950,-68.950) ENVELOPE(130.167,130.167,-66.250,-66.250) |
geographic |
Arctic Canada Greenland Les Dents Morse |
geographic_facet |
Arctic Canada Greenland Les Dents Morse |
genre |
Arctic Arctic Greenland greenlandic Groenland groenlandais inuit inuits Odobenus rosmarus morse walrus* |
genre_facet |
Arctic Arctic Greenland greenlandic Groenland groenlandais inuit inuits Odobenus rosmarus morse walrus* |
op_source |
ARCTIC; Vol. 56 No. 1 (2003): March: 1–109; 82-90 1923-1245 0004-0843 |
op_relation |
https://journalhosting.ucalgary.ca/index.php/arctic/article/view/63664/47600 https://journalhosting.ucalgary.ca/index.php/arctic/article/view/63664 |
container_title |
ARCTIC |
container_volume |
56 |
container_issue |
1 |
_version_ |
1766290667219189760 |
spelling |
ftunivcalgaryojs:oai:journalhosting.ucalgary.ca:article/63664 2023-05-15T14:19:06+02:00 Investigation of the Stock Structure of Atlantic Walrus (Odobenus rosmarus rosmarus) in Canada and Greenland Using Dental Pb Isotopes Derived from Local Geochemical Environments Outridge, P.M. Davis, W.J. Stewart, R.E.A. Born, E.W. 2003-01-01 application/pdf https://journalhosting.ucalgary.ca/index.php/arctic/article/view/63664 eng eng The Arctic Institute of North America https://journalhosting.ucalgary.ca/index.php/arctic/article/view/63664/47600 https://journalhosting.ucalgary.ca/index.php/arctic/article/view/63664 ARCTIC; Vol. 56 No. 1 (2003): March: 1–109; 82-90 1923-1245 0004-0843 walrus Odobenus rosmarus rosmarus teeth lead isotopes stock discrimination morse dents isotopes du plomb discrimination des stocks info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion research-article 2003 ftunivcalgaryojs 2022-03-22T21:20:58Z The chemical composition of animal tissues such as teeth appears to reflect an individual's exposure to its geochemical environment. In this study, the lead (Pb) isotope composition of dental cementum was used to investigate the stock structure of Atlantic walrus (Odobenus rosmarus rosmarus) in the Canadian Arctic and Greenland. The 12 communities providing walrus samples for this study represent most of the Canadian and Greenlandic villages where walrus still form an important part of the traditional Inuit diet. Significant differences between locations in mean Pb isotope ratios and the limited overlap of the ranges of values indicate that each village harvested walrus herds that exploited substantially different geological/geographical habitats. This geographic segregation based on isotopic signatures suggests that most walrus stocks (i.e., the groups of walrus that interact with hunters at each community) are more localized in their range than previously thought. 208Pb/207Pb and 208Pb/204Pb were the most important stock discriminators, reflecting the influence of local geological Th/U composition (i.e., 208Pb) on Pb isotope composition in walrus teeth. 204Pb-based isotope ratios in walrus were consistently higher (more radiogenic) and more homogeneous than those in regional terrestrial bedrock, a difference probably due to selective leaching of radiogenic Pb from mineral phases into seawater and mixing during weathering and transport. Dental Pb isotope signatures may have widespread application to stock discrimination of other coastal marine mammal species. La composition chimique de tissus animaux tels que les dents semble refléter l'exposition d'un individu à son milieu géochimique. Pour la présente étude, on a utilisé la composition isotopique du plomb (Pb) contenu dans le cément pour examiner la structure du stock du morse de l'Atlantique (Odobenus rosmarus rosmarus) dans l'Arctique canadien et le Groenland. Les 12 communautés qui ont fourni les échantillons de morse pour ce projet représentent la majorité des villages canadiens et groenlandais où le morse constitue toujours une grande partie du régime alimentaire traditionnel des Inuits. Des différences marquées entre les sites dans la moyenne des rapports isotopiques du Pb et le faible recoupement des gammes de valeurs révèlent que chaque village prélevait des morses au sein de troupeaux qui exploitaient des habitats géologiques/géographiques bien distincts. Cette ségrégation géographique fondée sur des signatures isotopiques suggère que la plupart des stocks de morses (c.-à-d. le groupe de morses qui interagit avec les chasseurs dans chaque communauté) sont plus localisés dans leur territoire qu'on ne le pensait auparavant. 208Pb/207Pb et 208Pb/204Pb étaient les grands caractères discriminants des stocks, reflétant l'influence de la composition géologique locale Th/U (c-à-d. 208Pb) sur la composition isotopique du Pb dans les dents du morse. Les rapports isotopiques fondés sur 204Pb étaient constamment plus élevés (plus radiogéniques) et plus homogènes que ceux du substratum terrestre, la différence étant probablement due à la lixiviation sélective du Pb radiogénique passant des phases minérales dans l'eau de mer et à son mélange durant la météorisation et le transport. Les signatures isotopiques du plomb dentaire peuvent avoir de vastes applications dans la discrimination des stocks d'autres espèces de mammifères marins côtiers. Article in Journal/Newspaper Arctic Arctic Greenland greenlandic Groenland groenlandais inuit inuits Odobenus rosmarus morse walrus* University of Calgary Journal Hosting Arctic Canada Greenland Les Dents ENVELOPE(-70.967,-70.967,-68.950,-68.950) Morse ENVELOPE(130.167,130.167,-66.250,-66.250) ARCTIC 56 1 |