Abundance of walruses in Eastern Baffin Bay and Davis Strait
Walruses (Odobenus rosmarus) are exploited for subsistence purposes in West Greenland. However, current information about the abundance of walruses subject to harvest in eastern Baffin Bay subject to harvest has been unavailable despite being critical for maintaining sustainable catch levels. Three...
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Septentrio Academic Publishing
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ftdoajarticles:oai:doaj.org/article:906762f5d5a24a7fa791451126fd3e7e 2023-05-15T15:34:57+02:00 Abundance of walruses in Eastern Baffin Bay and Davis Strait Mads Peter Heide-Jørgensen Kristin Laidre Sabrina Fossette Marianne H Rasmussen Nynne Hjort Nielsen Rikke G Hansen 2014-12-01T00:00:00Z https://doi.org/10.7557/3.2606 https://doaj.org/article/906762f5d5a24a7fa791451126fd3e7e EN eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2606 https://doaj.org/toc/1560-2206 https://doaj.org/toc/2309-2491 1560-2206 2309-2491 doi:10.7557/3.2606 https://doaj.org/article/906762f5d5a24a7fa791451126fd3e7e NAMMCO Scientific Publications, Vol 9, Iss 0, Pp 159-171 (2014) walrus Odobenus rosmarus abundance aerial survey West Greenland Ecology QH540-549.5 article 2014 ftdoajarticles https://doi.org/10.7557/3.2606 2022-12-31T00:14:24Z Walruses (Odobenus rosmarus) are exploited for subsistence purposes in West Greenland. However, current information about the abundance of walruses subject to harvest in eastern Baffin Bay subject to harvest has been unavailable despite being critical for maintaining sustainable catch levels. Three visual aerial surveys were conducted in 2006 (21 March to 19 April 2006), 2008 (3 to 12 April) and 2012 (24 March to 14 April) to estimate the number of walruses on the wintering grounds in eastern Baffin Bay and Davis Strait. Data on the fraction of walruses that were submerged below a 2m detection threshold during the surveys were obtained from 24 walruses instrumented with satellite-linked-time-depth-recorders in northern Baffin Bay in May-June 2010-2012. An availability correction factor was estimated at 36.5% (cv=0.08) after filtering of data for an observed drift of the pressure transducer of more than 2.5 m. The surveys resulted in walrus abundance estimates that were corrected for walruses submerged below a detection threshold and for walruses that were missed by the observers. The estimates of abundance were 1,105 (cv=0.31, 95% CI 610-2,002) in 2006, 1,137 (0.48, 468-2,758) in 2008 and 1,408 (0.22, 922-2,150) in 2012. Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin Davis Strait Greenland Odobenus rosmarus walrus* Directory of Open Access Journals: DOAJ Articles Baffin Bay Greenland NAMMCO Scientific Publications 9 159 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
walrus Odobenus rosmarus abundance aerial survey West Greenland Ecology QH540-549.5 |
spellingShingle |
walrus Odobenus rosmarus abundance aerial survey West Greenland Ecology QH540-549.5 Mads Peter Heide-Jørgensen Kristin Laidre Sabrina Fossette Marianne H Rasmussen Nynne Hjort Nielsen Rikke G Hansen Abundance of walruses in Eastern Baffin Bay and Davis Strait |
topic_facet |
walrus Odobenus rosmarus abundance aerial survey West Greenland Ecology QH540-549.5 |
description |
Walruses (Odobenus rosmarus) are exploited for subsistence purposes in West Greenland. However, current information about the abundance of walruses subject to harvest in eastern Baffin Bay subject to harvest has been unavailable despite being critical for maintaining sustainable catch levels. Three visual aerial surveys were conducted in 2006 (21 March to 19 April 2006), 2008 (3 to 12 April) and 2012 (24 March to 14 April) to estimate the number of walruses on the wintering grounds in eastern Baffin Bay and Davis Strait. Data on the fraction of walruses that were submerged below a 2m detection threshold during the surveys were obtained from 24 walruses instrumented with satellite-linked-time-depth-recorders in northern Baffin Bay in May-June 2010-2012. An availability correction factor was estimated at 36.5% (cv=0.08) after filtering of data for an observed drift of the pressure transducer of more than 2.5 m. The surveys resulted in walrus abundance estimates that were corrected for walruses submerged below a detection threshold and for walruses that were missed by the observers. The estimates of abundance were 1,105 (cv=0.31, 95% CI 610-2,002) in 2006, 1,137 (0.48, 468-2,758) in 2008 and 1,408 (0.22, 922-2,150) in 2012. |
format |
Article in Journal/Newspaper |
author |
Mads Peter Heide-Jørgensen Kristin Laidre Sabrina Fossette Marianne H Rasmussen Nynne Hjort Nielsen Rikke G Hansen |
author_facet |
Mads Peter Heide-Jørgensen Kristin Laidre Sabrina Fossette Marianne H Rasmussen Nynne Hjort Nielsen Rikke G Hansen |
author_sort |
Mads Peter Heide-Jørgensen |
title |
Abundance of walruses in Eastern Baffin Bay and Davis Strait |
title_short |
Abundance of walruses in Eastern Baffin Bay and Davis Strait |
title_full |
Abundance of walruses in Eastern Baffin Bay and Davis Strait |
title_fullStr |
Abundance of walruses in Eastern Baffin Bay and Davis Strait |
title_full_unstemmed |
Abundance of walruses in Eastern Baffin Bay and Davis Strait |
title_sort |
abundance of walruses in eastern baffin bay and davis strait |
publisher |
Septentrio Academic Publishing |
publishDate |
2014 |
url |
https://doi.org/10.7557/3.2606 https://doaj.org/article/906762f5d5a24a7fa791451126fd3e7e |
geographic |
Baffin Bay Greenland |
geographic_facet |
Baffin Bay Greenland |
genre |
Baffin Bay Baffin Bay Baffin Davis Strait Greenland Odobenus rosmarus walrus* |
genre_facet |
Baffin Bay Baffin Bay Baffin Davis Strait Greenland Odobenus rosmarus walrus* |
op_source |
NAMMCO Scientific Publications, Vol 9, Iss 0, Pp 159-171 (2014) |
op_relation |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2606 https://doaj.org/toc/1560-2206 https://doaj.org/toc/2309-2491 1560-2206 2309-2491 doi:10.7557/3.2606 https://doaj.org/article/906762f5d5a24a7fa791451126fd3e7e |
op_doi |
https://doi.org/10.7557/3.2606 |
container_title |
NAMMCO Scientific Publications |
container_volume |
9 |
container_start_page |
159 |
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1766365209751977984 |