Video_1_Animal-borne video cameras reveal differences in northern fur seal foraging behavior related to prey size selection.mp4
A key aspect of foraging ecology research is understanding how predator foraging behavior and success are influenced by variation in prey resources. For northern fur seals (Callorhinus ursinus), an understanding of predator-prey relationships is critical to help identify potential causes for the une...
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2022
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ftfrontimediafig:oai:figshare.com:article/21212660 2024-09-09T19:33:54+00:00 Video_1_Animal-borne video cameras reveal differences in northern fur seal foraging behavior related to prey size selection.mp4 Carey E. Kuhn Jeremy T. Sterling Molly McCormley Burlyn Birkemeier Angel Sar Audrey Flock Calvin W. Mordy 2022-09-27T05:26:37Z https://doi.org/10.3389/fmars.2022.1015594.s002 https://figshare.com/articles/media/Video_1_Animal-borne_video_cameras_reveal_differences_in_northern_fur_seal_foraging_behavior_related_to_prey_size_selection_mp4/21212660 unknown doi:10.3389/fmars.2022.1015594.s002 https://figshare.com/articles/media/Video_1_Animal-borne_video_cameras_reveal_differences_in_northern_fur_seal_foraging_behavior_related_to_prey_size_selection_mp4/21212660 CC BY 4.0 Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering northern fur seal Callorhinus ursinus Bering Sea foraging behavior video prey capture walleye pollock dive behavior Dataset Media 2022 ftfrontimediafig https://doi.org/10.3389/fmars.2022.1015594.s002 2024-08-19T06:19:50Z A key aspect of foraging ecology research is understanding how predator foraging behavior and success are influenced by variation in prey resources. For northern fur seals (Callorhinus ursinus), an understanding of predator-prey relationships is critical to help identify potential causes for the unexplained population decline in Alaska. To examine how foraging behavior differs based on prey size selection, we equipped northern fur seals on St. Paul and St. George islands (Alaska, USA) in September (2017, n=6) and August (2018, n=4, and 2019, n=3) with satellite-linked dive recorders and animal-borne video cameras. We categorized prey capture attempts based on relative prey size (small vs. large) and examined differences in capture depth, time of day, water temperature, and depth relative to the mixed-layer. Successful prey captures (n= 2224) primarily occurred at night (89.7 ± 3.1%) and small prey accounted for the majority of captures (70.5 ± 13.2%), but there was significant variation among individuals. Large prey were captured at nearly twice the depth of small prey (42.9 ± 3.7 m and 23.1 ± 1.8 m, respectively) and the proportion of large prey caught during the day was 3 times higher than at night (0.77 ± 0.1 vs. 0.25 ± 0.1). There was no relationship between prey size and water temperature after we accounted for temperature changes with depth. The highest proportion of prey captures occurred below the mixed-layer depth regardless of prey size, but the proportion of small prey captures above mixed-layer depth was double that of large prey. This enhanced understanding of northern fur seal prey capture behavior will be pivotal for better interpretation of decades of historical dive and diet data and can provide insight into how northern fur seals may respond to future variation in prey resources, which is essential to develop ecosystem-based approaches for northern fur seal conservation. Dataset Bering Sea Alaska Callorhinus ursinus Northern fur seal Frontiers: Figshare Bering Sea George Islands ENVELOPE(-121.887,-121.887,65.534,65.534) |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering northern fur seal Callorhinus ursinus Bering Sea foraging behavior video prey capture walleye pollock dive behavior |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering northern fur seal Callorhinus ursinus Bering Sea foraging behavior video prey capture walleye pollock dive behavior Carey E. Kuhn Jeremy T. Sterling Molly McCormley Burlyn Birkemeier Angel Sar Audrey Flock Calvin W. Mordy Video_1_Animal-borne video cameras reveal differences in northern fur seal foraging behavior related to prey size selection.mp4 |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering northern fur seal Callorhinus ursinus Bering Sea foraging behavior video prey capture walleye pollock dive behavior |
description |
A key aspect of foraging ecology research is understanding how predator foraging behavior and success are influenced by variation in prey resources. For northern fur seals (Callorhinus ursinus), an understanding of predator-prey relationships is critical to help identify potential causes for the unexplained population decline in Alaska. To examine how foraging behavior differs based on prey size selection, we equipped northern fur seals on St. Paul and St. George islands (Alaska, USA) in September (2017, n=6) and August (2018, n=4, and 2019, n=3) with satellite-linked dive recorders and animal-borne video cameras. We categorized prey capture attempts based on relative prey size (small vs. large) and examined differences in capture depth, time of day, water temperature, and depth relative to the mixed-layer. Successful prey captures (n= 2224) primarily occurred at night (89.7 ± 3.1%) and small prey accounted for the majority of captures (70.5 ± 13.2%), but there was significant variation among individuals. Large prey were captured at nearly twice the depth of small prey (42.9 ± 3.7 m and 23.1 ± 1.8 m, respectively) and the proportion of large prey caught during the day was 3 times higher than at night (0.77 ± 0.1 vs. 0.25 ± 0.1). There was no relationship between prey size and water temperature after we accounted for temperature changes with depth. The highest proportion of prey captures occurred below the mixed-layer depth regardless of prey size, but the proportion of small prey captures above mixed-layer depth was double that of large prey. This enhanced understanding of northern fur seal prey capture behavior will be pivotal for better interpretation of decades of historical dive and diet data and can provide insight into how northern fur seals may respond to future variation in prey resources, which is essential to develop ecosystem-based approaches for northern fur seal conservation. |
format |
Dataset |
author |
Carey E. Kuhn Jeremy T. Sterling Molly McCormley Burlyn Birkemeier Angel Sar Audrey Flock Calvin W. Mordy |
author_facet |
Carey E. Kuhn Jeremy T. Sterling Molly McCormley Burlyn Birkemeier Angel Sar Audrey Flock Calvin W. Mordy |
author_sort |
Carey E. Kuhn |
title |
Video_1_Animal-borne video cameras reveal differences in northern fur seal foraging behavior related to prey size selection.mp4 |
title_short |
Video_1_Animal-borne video cameras reveal differences in northern fur seal foraging behavior related to prey size selection.mp4 |
title_full |
Video_1_Animal-borne video cameras reveal differences in northern fur seal foraging behavior related to prey size selection.mp4 |
title_fullStr |
Video_1_Animal-borne video cameras reveal differences in northern fur seal foraging behavior related to prey size selection.mp4 |
title_full_unstemmed |
Video_1_Animal-borne video cameras reveal differences in northern fur seal foraging behavior related to prey size selection.mp4 |
title_sort |
video_1_animal-borne video cameras reveal differences in northern fur seal foraging behavior related to prey size selection.mp4 |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.1015594.s002 https://figshare.com/articles/media/Video_1_Animal-borne_video_cameras_reveal_differences_in_northern_fur_seal_foraging_behavior_related_to_prey_size_selection_mp4/21212660 |
long_lat |
ENVELOPE(-121.887,-121.887,65.534,65.534) |
geographic |
Bering Sea George Islands |
geographic_facet |
Bering Sea George Islands |
genre |
Bering Sea Alaska Callorhinus ursinus Northern fur seal |
genre_facet |
Bering Sea Alaska Callorhinus ursinus Northern fur seal |
op_relation |
doi:10.3389/fmars.2022.1015594.s002 https://figshare.com/articles/media/Video_1_Animal-borne_video_cameras_reveal_differences_in_northern_fur_seal_foraging_behavior_related_to_prey_size_selection_mp4/21212660 |
op_rights |
CC BY 4.0 |
op_doi |
https://doi.org/10.3389/fmars.2022.1015594.s002 |
_version_ |
1809903423078793216 |