The Laptev Sea walrus Odobenus rosmarus laptevi: an enigma revisited
The walrus (Odobenus rosmarus) is in some current systematic schemes divided into three subspecies: O. r. rosmarus in the North Atlantic, O. r. divergens in the North Pacific and O. r. laptevi in the Laptev Sea. These three subspecies have been described as differing in body size, but the taxonomic...
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Wiley-Blackwell
2009
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ftulundlup:oai:lup.lub.lu.se:a7dc3d49-557c-4db0-b3dc-e8e67f86c0a6 2023-05-15T17:07:11+02:00 The Laptev Sea walrus Odobenus rosmarus laptevi: an enigma revisited Lindqvist, Charlotte Bachmann, Lutz Andersen, Liselotte W. Born, Erik W. Arnason, Ulfur Kovacs, Kit M. Lydersen, Christian Abramov, Alexei V. Wiig, Oystein 2009 https://lup.lub.lu.se/record/1372021 https://doi.org/10.1111/j.1463-6409.2008.00364.x eng eng Wiley-Blackwell https://lup.lub.lu.se/record/1372021 http://dx.doi.org/10.1111/j.1463-6409.2008.00364.x wos:000263522800001 scopus:61349159188 Zoologica Scripta; 38(2), pp 113-127 (2009) ISSN: 0300-3256 Biological Sciences contributiontojournal/article info:eu-repo/semantics/article text 2009 ftulundlup https://doi.org/10.1111/j.1463-6409.2008.00364.x 2023-02-01T23:35:29Z The walrus (Odobenus rosmarus) is in some current systematic schemes divided into three subspecies: O. r. rosmarus in the North Atlantic, O. r. divergens in the North Pacific and O. r. laptevi in the Laptev Sea. These three subspecies have been described as differing in body size, but the taxonomic status of O. r. laptevi is disputed. The current study applies molecular and morphometric methods to assess the taxonomic status of O. r. laptevi and to analyse the systematic and phylogeographic relationships between the three purported walrus subspecies. Tusk length and tusk circumference were measured from the few skulls available of O. r. laptevi, and the obtained values were within the ranges reported for Pacific walruses. Thus, morphologically, subspecies status for O. r. laptevi is not supported according to the Amadon Mayr '75% rule'. Phylogenetic analyses and haplotype networks based on mitochondrial nucleotide sequence data of NADH dehydrogenase 1, 16S rRNA, cytochrome oxidase I and the D-loop of the control region of the historic O. r. laptevi bone material and contemporary O. r. rosmarus and O. r. divergens showed that the Laptev Sea walrus groups with individuals from the North Pacific. Thus, the mitochondrial sequence data do not support the recognition of three walrus subspecies as reciprocally monophyletic evolutionary units with independent evolutionary histories. Only O. r. rosmarus and O. r. divergens meet this criterion with the present sampling. Accordingly, we recommend that Odobenus r. laptevi be abandoned and the Laptev walrus instead be recognized as the westernmost population of the Pacific walrus, Odobenus r. divergens. However, further research is recommended to assess whether the Laptev walrus could be considered as a significant unit in terms of conservation and management, since it is unique in several ecological parameters. Article in Journal/Newspaper laptev Laptev Sea North Atlantic Odobenus rosmarus walrus* Lund University Publications (LUP) Laptev Sea Pacific Zoologica Scripta 38 2 113 127 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Biological Sciences |
spellingShingle |
Biological Sciences Lindqvist, Charlotte Bachmann, Lutz Andersen, Liselotte W. Born, Erik W. Arnason, Ulfur Kovacs, Kit M. Lydersen, Christian Abramov, Alexei V. Wiig, Oystein The Laptev Sea walrus Odobenus rosmarus laptevi: an enigma revisited |
topic_facet |
Biological Sciences |
description |
The walrus (Odobenus rosmarus) is in some current systematic schemes divided into three subspecies: O. r. rosmarus in the North Atlantic, O. r. divergens in the North Pacific and O. r. laptevi in the Laptev Sea. These three subspecies have been described as differing in body size, but the taxonomic status of O. r. laptevi is disputed. The current study applies molecular and morphometric methods to assess the taxonomic status of O. r. laptevi and to analyse the systematic and phylogeographic relationships between the three purported walrus subspecies. Tusk length and tusk circumference were measured from the few skulls available of O. r. laptevi, and the obtained values were within the ranges reported for Pacific walruses. Thus, morphologically, subspecies status for O. r. laptevi is not supported according to the Amadon Mayr '75% rule'. Phylogenetic analyses and haplotype networks based on mitochondrial nucleotide sequence data of NADH dehydrogenase 1, 16S rRNA, cytochrome oxidase I and the D-loop of the control region of the historic O. r. laptevi bone material and contemporary O. r. rosmarus and O. r. divergens showed that the Laptev Sea walrus groups with individuals from the North Pacific. Thus, the mitochondrial sequence data do not support the recognition of three walrus subspecies as reciprocally monophyletic evolutionary units with independent evolutionary histories. Only O. r. rosmarus and O. r. divergens meet this criterion with the present sampling. Accordingly, we recommend that Odobenus r. laptevi be abandoned and the Laptev walrus instead be recognized as the westernmost population of the Pacific walrus, Odobenus r. divergens. However, further research is recommended to assess whether the Laptev walrus could be considered as a significant unit in terms of conservation and management, since it is unique in several ecological parameters. |
format |
Article in Journal/Newspaper |
author |
Lindqvist, Charlotte Bachmann, Lutz Andersen, Liselotte W. Born, Erik W. Arnason, Ulfur Kovacs, Kit M. Lydersen, Christian Abramov, Alexei V. Wiig, Oystein |
author_facet |
Lindqvist, Charlotte Bachmann, Lutz Andersen, Liselotte W. Born, Erik W. Arnason, Ulfur Kovacs, Kit M. Lydersen, Christian Abramov, Alexei V. Wiig, Oystein |
author_sort |
Lindqvist, Charlotte |
title |
The Laptev Sea walrus Odobenus rosmarus laptevi: an enigma revisited |
title_short |
The Laptev Sea walrus Odobenus rosmarus laptevi: an enigma revisited |
title_full |
The Laptev Sea walrus Odobenus rosmarus laptevi: an enigma revisited |
title_fullStr |
The Laptev Sea walrus Odobenus rosmarus laptevi: an enigma revisited |
title_full_unstemmed |
The Laptev Sea walrus Odobenus rosmarus laptevi: an enigma revisited |
title_sort |
laptev sea walrus odobenus rosmarus laptevi: an enigma revisited |
publisher |
Wiley-Blackwell |
publishDate |
2009 |
url |
https://lup.lub.lu.se/record/1372021 https://doi.org/10.1111/j.1463-6409.2008.00364.x |
geographic |
Laptev Sea Pacific |
geographic_facet |
Laptev Sea Pacific |
genre |
laptev Laptev Sea North Atlantic Odobenus rosmarus walrus* |
genre_facet |
laptev Laptev Sea North Atlantic Odobenus rosmarus walrus* |
op_source |
Zoologica Scripta; 38(2), pp 113-127 (2009) ISSN: 0300-3256 |
op_relation |
https://lup.lub.lu.se/record/1372021 http://dx.doi.org/10.1111/j.1463-6409.2008.00364.x wos:000263522800001 scopus:61349159188 |
op_doi |
https://doi.org/10.1111/j.1463-6409.2008.00364.x |
container_title |
Zoologica Scripta |
container_volume |
38 |
container_issue |
2 |
container_start_page |
113 |
op_container_end_page |
127 |
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1766062453496479744 |