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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ftunitroemsoe:oai:ojs.henry.ub.uit.no:article/2615 2023-05-15T15:35:22+02:00 Estimates of Minimum Population Size for Walrus near Southeast Baffin Island, Nunavut Stewart, Robert EA Born, Erik W Dietz, Rune Ryan, Anna K 2014-12-15 application/pdf https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2615 https://doi.org/10.7557/3.2615 eng eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2615/3280 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2615 doi:10.7557/3.2615 Copyright (c) 2014 Robert EA Stewart, Erik W Born, Rune Dietz, Anna K Ryan http://creativecommons.org/licenses/by/3.0/ CC-BY NAMMCO Scientific Publications; Vol 9: Walrus of the North Atlantic; 141-157 2309-2491 1560-2206 10.7557/3.9 walrus Odobenus rosmarus Canada Greenland minimum counted population aerial surveys abundance info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2014 ftunitroemsoe https://doi.org/10.7557/3.2615 https://doi.org/10.7557/3.9 2021-08-16T16:36:30Z 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* University of Tromsø: Septentrio Academic Publishing Baffin Island Canada Cape Dyer ENVELOPE(-61.573,-61.573,66.592,66.592) Dyer ENVELOPE(-81.366,-81.366,50.550,50.550) Greenland Hoare ENVELOPE(162.850,162.850,-77.633,-77.633) Hoare Bay ENVELOPE(-63.080,-63.080,65.284,65.284) Hudson Hudson Bay Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Isabella Bay ENVELOPE(-67.547,-67.547,69.618,69.618) Loks Land ENVELOPE(-64.631,-64.631,62.434,62.434) Nunavut Saddleback Island ENVELOPE(-67.898,-67.898,62.151,62.151) NAMMCO Scientific Publications 9 141 |
institution |
Open Polar |
collection |
University of Tromsø: Septentrio Academic Publishing |
op_collection_id |
ftunitroemsoe |
language |
English |
topic |
walrus Odobenus rosmarus Canada Greenland minimum counted population aerial surveys abundance |
spellingShingle |
walrus Odobenus rosmarus Canada Greenland minimum counted population aerial surveys abundance Stewart, Robert EA Born, Erik W Dietz, Rune Ryan, Anna K 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 |
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 |
Stewart, Robert EA Born, Erik W Dietz, Rune Ryan, Anna K |
author_facet |
Stewart, Robert EA Born, Erik W Dietz, Rune Ryan, Anna K |
author_sort |
Stewart, Robert EA |
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://septentrio.uit.no/index.php/NAMMCOSP/article/view/2615 https://doi.org/10.7557/3.2615 |
long_lat |
ENVELOPE(-61.573,-61.573,66.592,66.592) ENVELOPE(-81.366,-81.366,50.550,50.550) ENVELOPE(162.850,162.850,-77.633,-77.633) ENVELOPE(-63.080,-63.080,65.284,65.284) ENVELOPE(-70.000,-70.000,62.000,62.000) ENVELOPE(-67.547,-67.547,69.618,69.618) ENVELOPE(-64.631,-64.631,62.434,62.434) ENVELOPE(-67.898,-67.898,62.151,62.151) |
geographic |
Baffin Island Canada Cape Dyer Dyer Greenland Hoare Hoare Bay Hudson Hudson Bay Hudson Strait Isabella Bay Loks Land Nunavut Saddleback Island |
geographic_facet |
Baffin Island Canada Cape Dyer Dyer Greenland Hoare Hoare Bay Hudson Hudson Bay Hudson Strait Isabella Bay Loks Land Nunavut 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: Walrus of the North Atlantic; 141-157 2309-2491 1560-2206 10.7557/3.9 |
op_relation |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2615/3280 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2615 doi:10.7557/3.2615 |
op_rights |
Copyright (c) 2014 Robert EA Stewart, Erik W Born, Rune Dietz, Anna K Ryan http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.7557/3.2615 https://doi.org/10.7557/3.9 |
container_title |
NAMMCO Scientific Publications |
container_volume |
9 |
container_start_page |
141 |
_version_ |
1766365706703601664 |