Proximity to multiple foraging habitats enhances seabirds’ resilience to local food shortages
As central-place foragers, seabirds from colonies located close to multiple and/or productive marine habitats might experience increased foraging opportunities and enhanced resilience to food shortages. We tested whether this hypothesis might explain divergent trends in 3 populations of black-legged...
Main Authors: | , , , , , , , , |
---|---|
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English unknown |
Published: |
Inter-Research
|
Subjects: | |
Online Access: | https://ir.library.oregonstate.edu/concern/articles/z316q212x |
id |
ftoregonstate:ir.library.oregonstate.edu:z316q212x |
---|---|
record_format |
openpolar |
spelling |
ftoregonstate:ir.library.oregonstate.edu:z316q212x 2024-09-15T17:59:26+00:00 Proximity to multiple foraging habitats enhances seabirds’ resilience to local food shortages Paredes, Rosana Harding, Ann M. A. Irons, David B. Roby, Daniel D. Suryan, Robert M. Orben, Rachael A. Renner, Heather Young, Rebecca Kitaysky, Alexander Fisheries and Wildlife https://ir.library.oregonstate.edu/concern/articles/z316q212x English [eng] eng unknown Inter-Research https://ir.library.oregonstate.edu/concern/articles/z316q212x Copyright Not Evaluated Article ftoregonstate 2024-07-22T18:06:04Z As central-place foragers, seabirds from colonies located close to multiple and/or productive marine habitats might experience increased foraging opportunities and enhanced resilience to food shortages. We tested whether this hypothesis might explain divergent trends in 3 populations of black-legged kittiwakes Rissa tridactyla, a surface-feeding piscivore, in the eastern Bering Sea. We simultaneously studied the foraging behavior, diet, nutritional stress, and breeding performance of chick-rearing kittiwakes from 2 continental shelf colonies (St. Paul and St. George) and an oceanic colony (Bogoslof). Although shelf-based forage fishes were rare or absent in bird diets during the cold study year, not all kittiwakes from the 3 colonies concentrated foraging along the productive shelf break habitats. Compared to the oceanic colony, birds from both shelf-located colonies had lower chick provisioning rates, higher levels of nutritional stress, and lower breeding performance. Although birds from both shelf-based colonies foraged in nearby neritic habitats during daytime, birds from St. George, a stable population located closest to the continental shelf break, also conducted long overnight trips to the ocean basin to feed on lipid-rich myctophids. In contrast, birds from St. Paul, a declining population located farthest from shelf break/oceanic habitats, fed exclusively over the shelf and obtained less high-energy food. Birds from Bogoslof, an increasing population, foraged mainly on myctophids close to the colony in the oceanic basin and Aleutian coast habitats. Our study suggests that proximity to multiple foraging habitats may explain divergent population trends among colonies of kittiwakes in the southeastern Bering Sea. Keywords: Seabird populations, Marine habitats, Bering Sea, Productivity, Diet, Kittiwakes, GPS tracking, Foraging strategies, Nutritional stress Keywords: Seabird populations, Marine habitats, Bering Sea, Productivity, Diet, Kittiwakes, GPS tracking, Foraging strategies, Nutritional stress Article in Journal/Newspaper Bering Sea rissa tridactyla ScholarsArchive@OSU (Oregon State University) |
institution |
Open Polar |
collection |
ScholarsArchive@OSU (Oregon State University) |
op_collection_id |
ftoregonstate |
language |
English unknown |
description |
As central-place foragers, seabirds from colonies located close to multiple and/or productive marine habitats might experience increased foraging opportunities and enhanced resilience to food shortages. We tested whether this hypothesis might explain divergent trends in 3 populations of black-legged kittiwakes Rissa tridactyla, a surface-feeding piscivore, in the eastern Bering Sea. We simultaneously studied the foraging behavior, diet, nutritional stress, and breeding performance of chick-rearing kittiwakes from 2 continental shelf colonies (St. Paul and St. George) and an oceanic colony (Bogoslof). Although shelf-based forage fishes were rare or absent in bird diets during the cold study year, not all kittiwakes from the 3 colonies concentrated foraging along the productive shelf break habitats. Compared to the oceanic colony, birds from both shelf-located colonies had lower chick provisioning rates, higher levels of nutritional stress, and lower breeding performance. Although birds from both shelf-based colonies foraged in nearby neritic habitats during daytime, birds from St. George, a stable population located closest to the continental shelf break, also conducted long overnight trips to the ocean basin to feed on lipid-rich myctophids. In contrast, birds from St. Paul, a declining population located farthest from shelf break/oceanic habitats, fed exclusively over the shelf and obtained less high-energy food. Birds from Bogoslof, an increasing population, foraged mainly on myctophids close to the colony in the oceanic basin and Aleutian coast habitats. Our study suggests that proximity to multiple foraging habitats may explain divergent population trends among colonies of kittiwakes in the southeastern Bering Sea. Keywords: Seabird populations, Marine habitats, Bering Sea, Productivity, Diet, Kittiwakes, GPS tracking, Foraging strategies, Nutritional stress Keywords: Seabird populations, Marine habitats, Bering Sea, Productivity, Diet, Kittiwakes, GPS tracking, Foraging strategies, Nutritional stress |
author2 |
Fisheries and Wildlife |
format |
Article in Journal/Newspaper |
author |
Paredes, Rosana Harding, Ann M. A. Irons, David B. Roby, Daniel D. Suryan, Robert M. Orben, Rachael A. Renner, Heather Young, Rebecca Kitaysky, Alexander |
spellingShingle |
Paredes, Rosana Harding, Ann M. A. Irons, David B. Roby, Daniel D. Suryan, Robert M. Orben, Rachael A. Renner, Heather Young, Rebecca Kitaysky, Alexander Proximity to multiple foraging habitats enhances seabirds’ resilience to local food shortages |
author_facet |
Paredes, Rosana Harding, Ann M. A. Irons, David B. Roby, Daniel D. Suryan, Robert M. Orben, Rachael A. Renner, Heather Young, Rebecca Kitaysky, Alexander |
author_sort |
Paredes, Rosana |
title |
Proximity to multiple foraging habitats enhances seabirds’ resilience to local food shortages |
title_short |
Proximity to multiple foraging habitats enhances seabirds’ resilience to local food shortages |
title_full |
Proximity to multiple foraging habitats enhances seabirds’ resilience to local food shortages |
title_fullStr |
Proximity to multiple foraging habitats enhances seabirds’ resilience to local food shortages |
title_full_unstemmed |
Proximity to multiple foraging habitats enhances seabirds’ resilience to local food shortages |
title_sort |
proximity to multiple foraging habitats enhances seabirds’ resilience to local food shortages |
publisher |
Inter-Research |
url |
https://ir.library.oregonstate.edu/concern/articles/z316q212x |
genre |
Bering Sea rissa tridactyla |
genre_facet |
Bering Sea rissa tridactyla |
op_relation |
https://ir.library.oregonstate.edu/concern/articles/z316q212x |
op_rights |
Copyright Not Evaluated |
_version_ |
1810436522836492288 |