Estimates of Minimum Population Size for Walrus near Southeast Baffin Island, Nunavut
To support management objectives in Canada and Greenland, joint research between the Department of Fisheries and Oceans and Greenland Institute of Natural Resources was begun in 2005. Direct counts were used to determine the Minimum Counted Population (MCP) in summer around SE Baffin Island. Aerial...
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2014
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ftdoajarticles:oai:doaj.org/article:aeef1edca24b4b70be7f8ebf522fef33 2023-05-15T15:35:22+02:00 Estimates of Minimum Population Size for Walrus near Southeast Baffin Island, Nunavut Robert EA Stewart Erik W Born Rune Dietz Anna K Ryan 2014-12-01T00:00:00Z https://doi.org/10.7557/3.2615 https://doaj.org/article/aeef1edca24b4b70be7f8ebf522fef33 EN eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2615 https://doaj.org/toc/1560-2206 https://doaj.org/toc/2309-2491 1560-2206 2309-2491 doi:10.7557/3.2615 https://doaj.org/article/aeef1edca24b4b70be7f8ebf522fef33 NAMMCO Scientific Publications, Vol 9, Iss 0, Pp 141-157 (2014) walrus Odobenus rosmarus Canada Greenland minimum counted population aerial surveys abundance Ecology QH540-549.5 article 2014 ftdoajarticles https://doi.org/10.7557/3.2615 2022-12-31T05:27:59Z To support management objectives in Canada and Greenland, joint research between the Department of Fisheries and Oceans and Greenland Institute of Natural Resources was begun in 2005. Direct counts were used to determine the Minimum Counted Population (MCP) in summer around SE Baffin Island. Aerial surveys examined the coast from roughly the Saddleback Island in northern Hudson Strait to Isabella Bay on eastern Baffin Island but concentrated on the area between Loks Land and Cape Dyer. The maximum count was obtained on 3–4 September 2007 during boat surveys. The MCP ranged from 716 (in 2006) to 1,056 (2007). Using the largest MCP adjusted with published maximum estimates of the proportion of walrus hauled out concurrently, we estimated 1,420 (95% CI: 1,219–1,622) walrus were present. In addition, four walrus had been fitted with satellite relayed data logger tags prior to the maximum counts in 2007. Using the simple proportion of ‘tags dry’ on 3 September to adjust counts on 3 and 4 September 2007 provided an estimate of 2,102 (CI = MCP-4,482). Using the proportion of time dry immediately preceding the survey to adjust the maximum count produced an estimate of 2,502 (CI = 1,660–3,345) walrus were present in Hoare Bay. We conclude approximately 2,100–2,500 walrus were present in Hoare Bay in late summer 2007. This number is a negatively biased estimator of the population of walrus around SE Baffin Island and in the Hudson Bay–Davis Strait stock as a whole. Broader survey coverage in a short period and more detailed information on the movement of walrus between Greenland and Canada and the summer dispersal of these animals within Canada are required to improve population estimates. Article in Journal/Newspaper Baffin Island Baffin Cape Dyer Davis Strait Greenland Greenland Institute of Natural Resources Hoare Bay Hudson Bay Hudson Strait Loks Land Nunavut Odobenus rosmarus walrus* Directory of Open Access Journals: DOAJ Articles Nunavut Hudson Bay Baffin Island Canada Greenland Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Dyer ENVELOPE(-81.366,-81.366,50.550,50.550) Hoare ENVELOPE(162.850,162.850,-77.633,-77.633) Cape Dyer ENVELOPE(-61.573,-61.573,66.592,66.592) Isabella Bay ENVELOPE(-67.547,-67.547,69.618,69.618) Hoare Bay ENVELOPE(-63.080,-63.080,65.284,65.284) Loks Land ENVELOPE(-64.631,-64.631,62.434,62.434) Saddleback Island ENVELOPE(-67.898,-67.898,62.151,62.151) NAMMCO Scientific Publications 9 141 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
walrus Odobenus rosmarus Canada Greenland minimum counted population aerial surveys abundance Ecology QH540-549.5 |
spellingShingle |
walrus Odobenus rosmarus Canada Greenland minimum counted population aerial surveys abundance Ecology QH540-549.5 Robert EA Stewart Erik W Born Rune Dietz Anna K Ryan Estimates of Minimum Population Size for Walrus near Southeast Baffin Island, Nunavut |
topic_facet |
walrus Odobenus rosmarus Canada Greenland minimum counted population aerial surveys abundance Ecology QH540-549.5 |
description |
To support management objectives in Canada and Greenland, joint research between the Department of Fisheries and Oceans and Greenland Institute of Natural Resources was begun in 2005. Direct counts were used to determine the Minimum Counted Population (MCP) in summer around SE Baffin Island. Aerial surveys examined the coast from roughly the Saddleback Island in northern Hudson Strait to Isabella Bay on eastern Baffin Island but concentrated on the area between Loks Land and Cape Dyer. The maximum count was obtained on 3–4 September 2007 during boat surveys. The MCP ranged from 716 (in 2006) to 1,056 (2007). Using the largest MCP adjusted with published maximum estimates of the proportion of walrus hauled out concurrently, we estimated 1,420 (95% CI: 1,219–1,622) walrus were present. In addition, four walrus had been fitted with satellite relayed data logger tags prior to the maximum counts in 2007. Using the simple proportion of ‘tags dry’ on 3 September to adjust counts on 3 and 4 September 2007 provided an estimate of 2,102 (CI = MCP-4,482). Using the proportion of time dry immediately preceding the survey to adjust the maximum count produced an estimate of 2,502 (CI = 1,660–3,345) walrus were present in Hoare Bay. We conclude approximately 2,100–2,500 walrus were present in Hoare Bay in late summer 2007. This number is a negatively biased estimator of the population of walrus around SE Baffin Island and in the Hudson Bay–Davis Strait stock as a whole. Broader survey coverage in a short period and more detailed information on the movement of walrus between Greenland and Canada and the summer dispersal of these animals within Canada are required to improve population estimates. |
format |
Article in Journal/Newspaper |
author |
Robert EA Stewart Erik W Born Rune Dietz Anna K Ryan |
author_facet |
Robert EA Stewart Erik W Born Rune Dietz Anna K Ryan |
author_sort |
Robert EA Stewart |
title |
Estimates of Minimum Population Size for Walrus near Southeast Baffin Island, Nunavut |
title_short |
Estimates of Minimum Population Size for Walrus near Southeast Baffin Island, Nunavut |
title_full |
Estimates of Minimum Population Size for Walrus near Southeast Baffin Island, Nunavut |
title_fullStr |
Estimates of Minimum Population Size for Walrus near Southeast Baffin Island, Nunavut |
title_full_unstemmed |
Estimates of Minimum Population Size for Walrus near Southeast Baffin Island, Nunavut |
title_sort |
estimates of minimum population size for walrus near southeast baffin island, nunavut |
publisher |
Septentrio Academic Publishing |
publishDate |
2014 |
url |
https://doi.org/10.7557/3.2615 https://doaj.org/article/aeef1edca24b4b70be7f8ebf522fef33 |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) ENVELOPE(-81.366,-81.366,50.550,50.550) ENVELOPE(162.850,162.850,-77.633,-77.633) ENVELOPE(-61.573,-61.573,66.592,66.592) ENVELOPE(-67.547,-67.547,69.618,69.618) ENVELOPE(-63.080,-63.080,65.284,65.284) ENVELOPE(-64.631,-64.631,62.434,62.434) ENVELOPE(-67.898,-67.898,62.151,62.151) |
geographic |
Nunavut Hudson Bay Baffin Island Canada Greenland Hudson Hudson Strait Dyer Hoare Cape Dyer Isabella Bay Hoare Bay Loks Land Saddleback Island |
geographic_facet |
Nunavut Hudson Bay Baffin Island Canada Greenland Hudson Hudson Strait Dyer Hoare Cape Dyer Isabella Bay Hoare Bay Loks Land Saddleback Island |
genre |
Baffin Island Baffin Cape Dyer Davis Strait Greenland Greenland Institute of Natural Resources Hoare Bay Hudson Bay Hudson Strait Loks Land Nunavut Odobenus rosmarus walrus* |
genre_facet |
Baffin Island Baffin Cape Dyer Davis Strait Greenland Greenland Institute of Natural Resources Hoare Bay Hudson Bay Hudson Strait Loks Land Nunavut Odobenus rosmarus walrus* |
op_source |
NAMMCO Scientific Publications, Vol 9, Iss 0, Pp 141-157 (2014) |
op_relation |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2615 https://doaj.org/toc/1560-2206 https://doaj.org/toc/2309-2491 1560-2206 2309-2491 doi:10.7557/3.2615 https://doaj.org/article/aeef1edca24b4b70be7f8ebf522fef33 |
op_doi |
https://doi.org/10.7557/3.2615 |
container_title |
NAMMCO Scientific Publications |
container_volume |
9 |
container_start_page |
141 |
_version_ |
1766365707448090624 |