Behavioral and Physiological Differences in Migratory Strategies of a Long-distance Migrant, the Blackpoll Warbler, and a Facultative Short-distance Migrant, the Yellow-rumped Warbler
The primary focus of these studies has been to investigate the functional role of corticosterone in the development of migratory condition (i.e. hyperphagia, lipogenesis, and migratory restlessness) and to investigate the underlying endocrine mechanisms of migratory condition in two species that dif...
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ftmaineuniv:oai:digitalcommons.library.umaine.edu:orsp_reports-1224 2023-05-15T15:55:08+02:00 Behavioral and Physiological Differences in Migratory Strategies of a Long-distance Migrant, the Blackpoll Warbler, and a Facultative Short-distance Migrant, the Yellow-rumped Warbler Holberton, Rebecca L. 2004-12-21T08:00:00Z application/pdf https://digitalcommons.library.umaine.edu/orsp_reports/217 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1224&context=orsp_reports unknown DigitalCommons@UMaine https://digitalcommons.library.umaine.edu/orsp_reports/217 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1224&context=orsp_reports This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s). University of Maine Office of Research Administration: Grant Reports Corticosterone Migratory condition Ornithology text 2004 ftmaineuniv 2023-03-12T19:15:56Z The primary focus of these studies has been to investigate the functional role of corticosterone in the development of migratory condition (i.e. hyperphagia, lipogenesis, and migratory restlessness) and to investigate the underlying endocrine mechanisms of migratory condition in two species that differ dramatically in their strategies for reaching their wintering grounds. The main approach has been to measure and to manipulate the peripheral signal molecule, corticosterone, and look at the resulting patterns of feeding behavior, body mass and fat reserves, migratory activity, and metabolites of energy use (fat deposition and protein use). In the comparative component, the Blackpoll warbler (Dendroica striata) was selected as the model for a long-distance migrant to be compared with its closely related and co-occurring congener, the Yellow-rumped warbler (D. coronata). Both species were sampled for plasma hormone and metabolite levels at two field sites representing two different stages in autumn migration. Free-living birds were sampled at Churchill, Manitoba, where both Final Report: 0196091 Page 6 of 26 species breed and pass through the area early on migration on their way further south and east. At that stage of migration, both species have similar energetic needs as they travel overland and are able to rest and replenish energy reserves along the way. However, at the second field site in coastal New England, both species co-occur in the same habitats but are preparing for the continuation of their journeys to their respective wintering grounds. In the northeastern United States, Blackpolls can double their body mass in fat reserves to prepare for a trans-oceanic, non-stop journey of 3-5 days over the North Atlantic to reach their wintering grounds in South America. In contrast, Yellow-rumped warblers will continue overland until they reach their wintering grounds in the southern United States. While some may cross the Gulf of Mexico to winter in Mexico, the journey can be reached in less than 20 hours. The ... Text Churchill North Atlantic The University of Maine: DigitalCommons@UMaine |
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The University of Maine: DigitalCommons@UMaine |
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ftmaineuniv |
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topic |
Corticosterone Migratory condition Ornithology |
spellingShingle |
Corticosterone Migratory condition Ornithology Holberton, Rebecca L. Behavioral and Physiological Differences in Migratory Strategies of a Long-distance Migrant, the Blackpoll Warbler, and a Facultative Short-distance Migrant, the Yellow-rumped Warbler |
topic_facet |
Corticosterone Migratory condition Ornithology |
description |
The primary focus of these studies has been to investigate the functional role of corticosterone in the development of migratory condition (i.e. hyperphagia, lipogenesis, and migratory restlessness) and to investigate the underlying endocrine mechanisms of migratory condition in two species that differ dramatically in their strategies for reaching their wintering grounds. The main approach has been to measure and to manipulate the peripheral signal molecule, corticosterone, and look at the resulting patterns of feeding behavior, body mass and fat reserves, migratory activity, and metabolites of energy use (fat deposition and protein use). In the comparative component, the Blackpoll warbler (Dendroica striata) was selected as the model for a long-distance migrant to be compared with its closely related and co-occurring congener, the Yellow-rumped warbler (D. coronata). Both species were sampled for plasma hormone and metabolite levels at two field sites representing two different stages in autumn migration. Free-living birds were sampled at Churchill, Manitoba, where both Final Report: 0196091 Page 6 of 26 species breed and pass through the area early on migration on their way further south and east. At that stage of migration, both species have similar energetic needs as they travel overland and are able to rest and replenish energy reserves along the way. However, at the second field site in coastal New England, both species co-occur in the same habitats but are preparing for the continuation of their journeys to their respective wintering grounds. In the northeastern United States, Blackpolls can double their body mass in fat reserves to prepare for a trans-oceanic, non-stop journey of 3-5 days over the North Atlantic to reach their wintering grounds in South America. In contrast, Yellow-rumped warblers will continue overland until they reach their wintering grounds in the southern United States. While some may cross the Gulf of Mexico to winter in Mexico, the journey can be reached in less than 20 hours. The ... |
format |
Text |
author |
Holberton, Rebecca L. |
author_facet |
Holberton, Rebecca L. |
author_sort |
Holberton, Rebecca L. |
title |
Behavioral and Physiological Differences in Migratory Strategies of a Long-distance Migrant, the Blackpoll Warbler, and a Facultative Short-distance Migrant, the Yellow-rumped Warbler |
title_short |
Behavioral and Physiological Differences in Migratory Strategies of a Long-distance Migrant, the Blackpoll Warbler, and a Facultative Short-distance Migrant, the Yellow-rumped Warbler |
title_full |
Behavioral and Physiological Differences in Migratory Strategies of a Long-distance Migrant, the Blackpoll Warbler, and a Facultative Short-distance Migrant, the Yellow-rumped Warbler |
title_fullStr |
Behavioral and Physiological Differences in Migratory Strategies of a Long-distance Migrant, the Blackpoll Warbler, and a Facultative Short-distance Migrant, the Yellow-rumped Warbler |
title_full_unstemmed |
Behavioral and Physiological Differences in Migratory Strategies of a Long-distance Migrant, the Blackpoll Warbler, and a Facultative Short-distance Migrant, the Yellow-rumped Warbler |
title_sort |
behavioral and physiological differences in migratory strategies of a long-distance migrant, the blackpoll warbler, and a facultative short-distance migrant, the yellow-rumped warbler |
publisher |
DigitalCommons@UMaine |
publishDate |
2004 |
url |
https://digitalcommons.library.umaine.edu/orsp_reports/217 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1224&context=orsp_reports |
genre |
Churchill North Atlantic |
genre_facet |
Churchill North Atlantic |
op_source |
University of Maine Office of Research Administration: Grant Reports |
op_relation |
https://digitalcommons.library.umaine.edu/orsp_reports/217 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1224&context=orsp_reports |
op_rights |
This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s). |
_version_ |
1766390477487079424 |