Microsatellite assessment of walrus ( Odobenus rosmarus rosmarus ) stocks in Canada
Walruses in Canada are currently subdivided into seven stocks based on summering areas; Western Jones Sound (WJS), Baffin Bay (BB), Penny Strait-Lancaster Sound (PS-LS), North Foxe Basin (N-FB), Central Foxe Basin (C-FB), Hudson Bay Davis Strait (HB-DS) and Southern and Eastern Hudson Bay (SE-HB). I...
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2014
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ftdoajarticles:oai:doaj.org/article:17fee362f50e41b1914c4c526e876a0a 2023-05-15T15:00:43+02:00 Microsatellite assessment of walrus ( Odobenus rosmarus rosmarus ) stocks in Canada Aaron BA Shafer Corey S Davis David W Coltman Robert EA Stewart 2014-12-01T00:00:00Z https://doi.org/10.7557/3.2607 https://doaj.org/article/17fee362f50e41b1914c4c526e876a0a EN eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2607 https://doaj.org/toc/1560-2206 https://doaj.org/toc/2309-2491 1560-2206 2309-2491 doi:10.7557/3.2607 https://doaj.org/article/17fee362f50e41b1914c4c526e876a0a NAMMCO Scientific Publications, Vol 9, Iss 0, Pp 15-31 (2014) walrus Odobenus rosmarus stocks genetics Canada Ecology QH540-549.5 article 2014 ftdoajarticles https://doi.org/10.7557/3.2607 2022-12-31T13:21:00Z Walruses in Canada are currently subdivided into seven stocks based on summering areas; Western Jones Sound (WJS), Baffin Bay (BB), Penny Strait-Lancaster Sound (PS-LS), North Foxe Basin (N-FB), Central Foxe Basin (C-FB), Hudson Bay Davis Strait (HB-DS) and Southern and Eastern Hudson Bay (SE-HB). In this study, walrus were sampled from six of the seven stocks (SE-HB samples were not available) and genotyped at 10 microsatellite loci. All stocks were genetically diverse (average heterozygosity of 0.58) with no evidence of inbreeding (average FIS of 0.03). We detected significant genetic differentiation among the stocks and a pattern of genetic spatial autocorrelation that suggests a moderate effect of geographic distance on gene flow among stocks. Bayesian clustering suggested the six recognized stocks were elements of two larger genetic clusters - a northern Arctic population (containing BB, WJS, and PS-LS stocks) and a central Arctic population (containing C-FB, N-FB, and HB-DS stocks). These populations are moderately differentiated (FST = 0.07), but based on evidence of contemporary movement from assignment tests, are not completely isolated. There was support for maintaining the WJS stock and a combined BB+PS-LS stock, although the latter conclusion is based on a small sample size. Similarly, there was some evidence suggesting separation of the Foxe Basin stocks from the HB-DS but not the N-FB from the C-FB stock. However, given that there are morphological and chemical differences between N-FB and C-FB stocks, there is currently insufficient evidence to support a revision of the current stock designations. Article in Journal/Newspaper Arctic Arctic Population Baffin Bay Baffin Bay Baffin Central Arctic Davis Strait Foxe Basin Hudson Bay Jones Sound Lancaster Sound Odobenus rosmarus walrus* Directory of Open Access Journals: DOAJ Articles Arctic Hudson Bay Baffin Bay Canada Hudson Lancaster Sound ENVELOPE(-83.999,-83.999,74.218,74.218) Foxe Basin ENVELOPE(-77.918,-77.918,65.931,65.931) Jones Sound ENVELOPE(-86.000,-86.000,76.002,76.002) Penny Strait ENVELOPE(-97.002,-97.002,76.502,76.502) NAMMCO Scientific Publications 9 15 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
walrus Odobenus rosmarus stocks genetics Canada Ecology QH540-549.5 |
spellingShingle |
walrus Odobenus rosmarus stocks genetics Canada Ecology QH540-549.5 Aaron BA Shafer Corey S Davis David W Coltman Robert EA Stewart Microsatellite assessment of walrus ( Odobenus rosmarus rosmarus ) stocks in Canada |
topic_facet |
walrus Odobenus rosmarus stocks genetics Canada Ecology QH540-549.5 |
description |
Walruses in Canada are currently subdivided into seven stocks based on summering areas; Western Jones Sound (WJS), Baffin Bay (BB), Penny Strait-Lancaster Sound (PS-LS), North Foxe Basin (N-FB), Central Foxe Basin (C-FB), Hudson Bay Davis Strait (HB-DS) and Southern and Eastern Hudson Bay (SE-HB). In this study, walrus were sampled from six of the seven stocks (SE-HB samples were not available) and genotyped at 10 microsatellite loci. All stocks were genetically diverse (average heterozygosity of 0.58) with no evidence of inbreeding (average FIS of 0.03). We detected significant genetic differentiation among the stocks and a pattern of genetic spatial autocorrelation that suggests a moderate effect of geographic distance on gene flow among stocks. Bayesian clustering suggested the six recognized stocks were elements of two larger genetic clusters - a northern Arctic population (containing BB, WJS, and PS-LS stocks) and a central Arctic population (containing C-FB, N-FB, and HB-DS stocks). These populations are moderately differentiated (FST = 0.07), but based on evidence of contemporary movement from assignment tests, are not completely isolated. There was support for maintaining the WJS stock and a combined BB+PS-LS stock, although the latter conclusion is based on a small sample size. Similarly, there was some evidence suggesting separation of the Foxe Basin stocks from the HB-DS but not the N-FB from the C-FB stock. However, given that there are morphological and chemical differences between N-FB and C-FB stocks, there is currently insufficient evidence to support a revision of the current stock designations. |
format |
Article in Journal/Newspaper |
author |
Aaron BA Shafer Corey S Davis David W Coltman Robert EA Stewart |
author_facet |
Aaron BA Shafer Corey S Davis David W Coltman Robert EA Stewart |
author_sort |
Aaron BA Shafer |
title |
Microsatellite assessment of walrus ( Odobenus rosmarus rosmarus ) stocks in Canada |
title_short |
Microsatellite assessment of walrus ( Odobenus rosmarus rosmarus ) stocks in Canada |
title_full |
Microsatellite assessment of walrus ( Odobenus rosmarus rosmarus ) stocks in Canada |
title_fullStr |
Microsatellite assessment of walrus ( Odobenus rosmarus rosmarus ) stocks in Canada |
title_full_unstemmed |
Microsatellite assessment of walrus ( Odobenus rosmarus rosmarus ) stocks in Canada |
title_sort |
microsatellite assessment of walrus ( odobenus rosmarus rosmarus ) stocks in canada |
publisher |
Septentrio Academic Publishing |
publishDate |
2014 |
url |
https://doi.org/10.7557/3.2607 https://doaj.org/article/17fee362f50e41b1914c4c526e876a0a |
long_lat |
ENVELOPE(-83.999,-83.999,74.218,74.218) ENVELOPE(-77.918,-77.918,65.931,65.931) ENVELOPE(-86.000,-86.000,76.002,76.002) ENVELOPE(-97.002,-97.002,76.502,76.502) |
geographic |
Arctic Hudson Bay Baffin Bay Canada Hudson Lancaster Sound Foxe Basin Jones Sound Penny Strait |
geographic_facet |
Arctic Hudson Bay Baffin Bay Canada Hudson Lancaster Sound Foxe Basin Jones Sound Penny Strait |
genre |
Arctic Arctic Population Baffin Bay Baffin Bay Baffin Central Arctic Davis Strait Foxe Basin Hudson Bay Jones Sound Lancaster Sound Odobenus rosmarus walrus* |
genre_facet |
Arctic Arctic Population Baffin Bay Baffin Bay Baffin Central Arctic Davis Strait Foxe Basin Hudson Bay Jones Sound Lancaster Sound Odobenus rosmarus walrus* |
op_source |
NAMMCO Scientific Publications, Vol 9, Iss 0, Pp 15-31 (2014) |
op_relation |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2607 https://doaj.org/toc/1560-2206 https://doaj.org/toc/2309-2491 1560-2206 2309-2491 doi:10.7557/3.2607 https://doaj.org/article/17fee362f50e41b1914c4c526e876a0a |
op_doi |
https://doi.org/10.7557/3.2607 |
container_title |
NAMMCO Scientific Publications |
container_volume |
9 |
container_start_page |
15 |
_version_ |
1766332793637306368 |