Ecological segregation of murres (Uria lomvia, Uria aalge) during the nonbreeding season in the northwest Atlantic ocean
When resources are limited and similar species co-occur, ecological segregation is likely to occur year-round, through spatial, temporal, behavioural and/or dietary segregation. This study investigates year-round ecological segregation between partially sympatric, congeneric Thick-billed Murres (Uri...
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Memorial University of Newfoundland
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ftmemorialuniv:oai:research.library.mun.ca:6375 2023-10-01T03:54:16+02:00 Ecological segregation of murres (Uria lomvia, Uria aalge) during the nonbreeding season in the northwest Atlantic ocean McFarlane Tranquilla, Laura 2014-05 application/pdf https://research.library.mun.ca/6375/ https://research.library.mun.ca/6375/1/McFarlaneTranquilla_Laura_PhDThesis_Dec2013.pdf https://research.library.mun.ca/6375/3/McFarlaneTranquilla_Laura_PhDThesis_Dec2013.pdf en eng Memorial University of Newfoundland https://research.library.mun.ca/6375/1/McFarlaneTranquilla_Laura_PhDThesis_Dec2013.pdf https://research.library.mun.ca/6375/3/McFarlaneTranquilla_Laura_PhDThesis_Dec2013.pdf McFarlane Tranquilla, Laura <https://research.library.mun.ca/view/creator_az/McFarlane_Tranquilla=3ALaura=3A=3A.html> (2014) Ecological segregation of murres (Uria lomvia, Uria aalge) during the nonbreeding season in the northwest Atlantic ocean. Doctoral (PhD) thesis, Memorial University of Newfoundland. thesis_license Thesis NonPeerReviewed 2014 ftmemorialuniv 2023-09-03T06:45:50Z When resources are limited and similar species co-occur, ecological segregation is likely to occur year-round, through spatial, temporal, behavioural and/or dietary segregation. This study investigates year-round ecological segregation between partially sympatric, congeneric Thick-billed Murres (Uria lomvia) and Common Murres (Uria aalge). In the Northwest Atlantic, the species exhibit a latitudinal divergence in breeding distributions. However, both winter in Low Arctic regions, where the potential for spatial overlap is greater than during the breeding period. Given the inaccessibility of murres at sea, the inter- and intra-specific interactions of murres wintering in the Northwest Atlantic have not been previously studied. Using tracking devices and isotopic analyses, this study integrates spatial and temporal movements during the nonbreeding period, relative overlap of winter habitat, and trophic positions during the nonbreeding period. Thick-billed and Common Murres remained partially segregated throughout the year, with some overlap among particular colony groups. Thick-billed Murres moved over a broad range of latitudes throughout the year, had varied core wintering locations, encountered variable environmental conditions, made variable seasonal movements, and had broad trophic positioning. In comparison, Common Murres concentrated and converged on more narrow wintering areas, where colonies had high spatial overlap, encountered similar environmental conditions with consistent temporal patterns, and occupied similar trophic positions. Habitat segregation occurred mostly spatially; but where spatial overlap was greater, inter-specific dietary segregation increased. Most individual murres (both species) exhibited consistent wintering strategies across 2-3 years, with a few individuals shifting habitats between years. Variation in winter movement patterns stemmed more from between-individual variation (particularly among Thick-billed Murres) than from annual changes within individuals. Ecological segregation ... Thesis Arctic Northwest Atlantic Uria aalge Uria lomvia uria Memorial University of Newfoundland: Research Repository Arctic |
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Memorial University of Newfoundland: Research Repository |
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ftmemorialuniv |
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English |
description |
When resources are limited and similar species co-occur, ecological segregation is likely to occur year-round, through spatial, temporal, behavioural and/or dietary segregation. This study investigates year-round ecological segregation between partially sympatric, congeneric Thick-billed Murres (Uria lomvia) and Common Murres (Uria aalge). In the Northwest Atlantic, the species exhibit a latitudinal divergence in breeding distributions. However, both winter in Low Arctic regions, where the potential for spatial overlap is greater than during the breeding period. Given the inaccessibility of murres at sea, the inter- and intra-specific interactions of murres wintering in the Northwest Atlantic have not been previously studied. Using tracking devices and isotopic analyses, this study integrates spatial and temporal movements during the nonbreeding period, relative overlap of winter habitat, and trophic positions during the nonbreeding period. Thick-billed and Common Murres remained partially segregated throughout the year, with some overlap among particular colony groups. Thick-billed Murres moved over a broad range of latitudes throughout the year, had varied core wintering locations, encountered variable environmental conditions, made variable seasonal movements, and had broad trophic positioning. In comparison, Common Murres concentrated and converged on more narrow wintering areas, where colonies had high spatial overlap, encountered similar environmental conditions with consistent temporal patterns, and occupied similar trophic positions. Habitat segregation occurred mostly spatially; but where spatial overlap was greater, inter-specific dietary segregation increased. Most individual murres (both species) exhibited consistent wintering strategies across 2-3 years, with a few individuals shifting habitats between years. Variation in winter movement patterns stemmed more from between-individual variation (particularly among Thick-billed Murres) than from annual changes within individuals. Ecological segregation ... |
format |
Thesis |
author |
McFarlane Tranquilla, Laura |
spellingShingle |
McFarlane Tranquilla, Laura Ecological segregation of murres (Uria lomvia, Uria aalge) during the nonbreeding season in the northwest Atlantic ocean |
author_facet |
McFarlane Tranquilla, Laura |
author_sort |
McFarlane Tranquilla, Laura |
title |
Ecological segregation of murres (Uria lomvia, Uria aalge) during the nonbreeding season in the northwest Atlantic ocean |
title_short |
Ecological segregation of murres (Uria lomvia, Uria aalge) during the nonbreeding season in the northwest Atlantic ocean |
title_full |
Ecological segregation of murres (Uria lomvia, Uria aalge) during the nonbreeding season in the northwest Atlantic ocean |
title_fullStr |
Ecological segregation of murres (Uria lomvia, Uria aalge) during the nonbreeding season in the northwest Atlantic ocean |
title_full_unstemmed |
Ecological segregation of murres (Uria lomvia, Uria aalge) during the nonbreeding season in the northwest Atlantic ocean |
title_sort |
ecological segregation of murres (uria lomvia, uria aalge) during the nonbreeding season in the northwest atlantic ocean |
publisher |
Memorial University of Newfoundland |
publishDate |
2014 |
url |
https://research.library.mun.ca/6375/ https://research.library.mun.ca/6375/1/McFarlaneTranquilla_Laura_PhDThesis_Dec2013.pdf https://research.library.mun.ca/6375/3/McFarlaneTranquilla_Laura_PhDThesis_Dec2013.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Northwest Atlantic Uria aalge Uria lomvia uria |
genre_facet |
Arctic Northwest Atlantic Uria aalge Uria lomvia uria |
op_relation |
https://research.library.mun.ca/6375/1/McFarlaneTranquilla_Laura_PhDThesis_Dec2013.pdf https://research.library.mun.ca/6375/3/McFarlaneTranquilla_Laura_PhDThesis_Dec2013.pdf McFarlane Tranquilla, Laura <https://research.library.mun.ca/view/creator_az/McFarlane_Tranquilla=3ALaura=3A=3A.html> (2014) Ecological segregation of murres (Uria lomvia, Uria aalge) during the nonbreeding season in the northwest Atlantic ocean. Doctoral (PhD) thesis, Memorial University of Newfoundland. |
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thesis_license |
_version_ |
1778521727641321472 |