A First Count of Thick-billed Murres (Uria lomvia) and Black-legged Kittiwakes (Rissa tridactyla) Breeding on Bylot Island
Bylot Island, part of Sirmilik National Park, supports two major breeding colonies of intermingled Thick-billed Murres (Uria lomvia) and Black-legged Kittiwakes (Rissa tridactyla): at Cape Hay near the northwest tip and at Cape Graham Moore at the opposite end of the island. Although the size of the...
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ftjcfn:oai:canadianfieldnaturalist.ca:article/1953 2023-05-15T14:59:49+02:00 A First Count of Thick-billed Murres (Uria lomvia) and Black-legged Kittiwakes (Rissa tridactyla) Breeding on Bylot Island Gaston, Anthony J. Cyr, Marc-Andre O'Dononvan, Kieran 2017-07-14 application/pdf https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/1953 https://doi.org/10.22621/cfn.v131i1.1953 eng eng The Ottawa Field-Naturalists' Club https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/1953/1872 https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/1953 doi:10.22621/cfn.v131i1.1953 Copyright (c) 2017 The Canadian Field-Naturalist The Canadian Field-Naturalist; Vol. 131 No. 1 (2017); 69-74 0008-3550 Population census Bylot Island Nunavut Thick-billed Murre Uria lomvia Black-legged Kittiwake Rissa tridactyla Sirmilik National Park Cape Graham Moore Cape Hay info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftjcfn https://doi.org/10.22621/cfn.v131i1.1953 2021-09-02T18:54:47Z Bylot Island, part of Sirmilik National Park, supports two major breeding colonies of intermingled Thick-billed Murres (Uria lomvia) and Black-legged Kittiwakes (Rissa tridactyla): at Cape Hay near the northwest tip and at Cape Graham Moore at the opposite end of the island. Although the size of these colonies has been estimated previously, there is no information on how the estimates were made, except for Thick-billed Murres at Cape Hay in 1977, when the numbers were based on sampling only about 30% of the colony. In 2013, high-resolution digital photographs of the whole area of both colonies were taken in July, when most birds were probably incubating eggs. Individual birds were counted on the photographs, and the numbers were corrected for image quality and converted to numbers of breeding pairs based on correction factors from another High Arctic colony. Our estimates were similar to those from earlier years for kittiwakes at Cape Graham Moore and for murres at Cape Hay, but suggested that numbers of murres were higher than previously thought at Cape Graham Moore, while numbers of kittiwakes were lower at Cape Hay. The overall total for the Canadian population of Thick-billed Murres was unaffected by these changes, but the total number of Black-legged Kittiwakes nesting in the Canadian Arctic may be 20% lower than previously thought. Article in Journal/Newspaper Arctic Black-legged Kittiwake Bylot Island Cape Graham Moore Nunavut rissa tridactyla Sirmilik National Park thick-billed murre Uria lomvia uria The Canadian Field-Naturalist (E-Journal) Arctic Bylot Island Cape Graham Moore ENVELOPE(-76.065,-76.065,72.868,72.868) Moore Cape ENVELOPE(167.900,167.900,-70.933,-70.933) Nunavut The Canadian Field-Naturalist 131 1 69 74 |
institution |
Open Polar |
collection |
The Canadian Field-Naturalist (E-Journal) |
op_collection_id |
ftjcfn |
language |
English |
topic |
Population census Bylot Island Nunavut Thick-billed Murre Uria lomvia Black-legged Kittiwake Rissa tridactyla Sirmilik National Park Cape Graham Moore Cape Hay |
spellingShingle |
Population census Bylot Island Nunavut Thick-billed Murre Uria lomvia Black-legged Kittiwake Rissa tridactyla Sirmilik National Park Cape Graham Moore Cape Hay Gaston, Anthony J. Cyr, Marc-Andre O'Dononvan, Kieran A First Count of Thick-billed Murres (Uria lomvia) and Black-legged Kittiwakes (Rissa tridactyla) Breeding on Bylot Island |
topic_facet |
Population census Bylot Island Nunavut Thick-billed Murre Uria lomvia Black-legged Kittiwake Rissa tridactyla Sirmilik National Park Cape Graham Moore Cape Hay |
description |
Bylot Island, part of Sirmilik National Park, supports two major breeding colonies of intermingled Thick-billed Murres (Uria lomvia) and Black-legged Kittiwakes (Rissa tridactyla): at Cape Hay near the northwest tip and at Cape Graham Moore at the opposite end of the island. Although the size of these colonies has been estimated previously, there is no information on how the estimates were made, except for Thick-billed Murres at Cape Hay in 1977, when the numbers were based on sampling only about 30% of the colony. In 2013, high-resolution digital photographs of the whole area of both colonies were taken in July, when most birds were probably incubating eggs. Individual birds were counted on the photographs, and the numbers were corrected for image quality and converted to numbers of breeding pairs based on correction factors from another High Arctic colony. Our estimates were similar to those from earlier years for kittiwakes at Cape Graham Moore and for murres at Cape Hay, but suggested that numbers of murres were higher than previously thought at Cape Graham Moore, while numbers of kittiwakes were lower at Cape Hay. The overall total for the Canadian population of Thick-billed Murres was unaffected by these changes, but the total number of Black-legged Kittiwakes nesting in the Canadian Arctic may be 20% lower than previously thought. |
format |
Article in Journal/Newspaper |
author |
Gaston, Anthony J. Cyr, Marc-Andre O'Dononvan, Kieran |
author_facet |
Gaston, Anthony J. Cyr, Marc-Andre O'Dononvan, Kieran |
author_sort |
Gaston, Anthony J. |
title |
A First Count of Thick-billed Murres (Uria lomvia) and Black-legged Kittiwakes (Rissa tridactyla) Breeding on Bylot Island |
title_short |
A First Count of Thick-billed Murres (Uria lomvia) and Black-legged Kittiwakes (Rissa tridactyla) Breeding on Bylot Island |
title_full |
A First Count of Thick-billed Murres (Uria lomvia) and Black-legged Kittiwakes (Rissa tridactyla) Breeding on Bylot Island |
title_fullStr |
A First Count of Thick-billed Murres (Uria lomvia) and Black-legged Kittiwakes (Rissa tridactyla) Breeding on Bylot Island |
title_full_unstemmed |
A First Count of Thick-billed Murres (Uria lomvia) and Black-legged Kittiwakes (Rissa tridactyla) Breeding on Bylot Island |
title_sort |
first count of thick-billed murres (uria lomvia) and black-legged kittiwakes (rissa tridactyla) breeding on bylot island |
publisher |
The Ottawa Field-Naturalists' Club |
publishDate |
2017 |
url |
https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/1953 https://doi.org/10.22621/cfn.v131i1.1953 |
long_lat |
ENVELOPE(-76.065,-76.065,72.868,72.868) ENVELOPE(167.900,167.900,-70.933,-70.933) |
geographic |
Arctic Bylot Island Cape Graham Moore Moore Cape Nunavut |
geographic_facet |
Arctic Bylot Island Cape Graham Moore Moore Cape Nunavut |
genre |
Arctic Black-legged Kittiwake Bylot Island Cape Graham Moore Nunavut rissa tridactyla Sirmilik National Park thick-billed murre Uria lomvia uria |
genre_facet |
Arctic Black-legged Kittiwake Bylot Island Cape Graham Moore Nunavut rissa tridactyla Sirmilik National Park thick-billed murre Uria lomvia uria |
op_source |
The Canadian Field-Naturalist; Vol. 131 No. 1 (2017); 69-74 0008-3550 |
op_relation |
https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/1953/1872 https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/1953 doi:10.22621/cfn.v131i1.1953 |
op_rights |
Copyright (c) 2017 The Canadian Field-Naturalist |
op_doi |
https://doi.org/10.22621/cfn.v131i1.1953 |
container_title |
The Canadian Field-Naturalist |
container_volume |
131 |
container_issue |
1 |
container_start_page |
69 |
op_container_end_page |
74 |
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1766331933717954560 |