Video_1_Evidence for Size-Selective Predation by Antarctic Humpback Whales.MP4
Animals aggregate around resource hotspots, but what makes one resource more appealing than another can be difficult to determine. In March 2020 the Antarctic fjord Charlotte Bay included >5× as many humpback whales as neighboring Wilhelmina Bay, a site previously known for super aggregations of...
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ftsmithonian:oai:figshare.com:article/19095035 2023-05-15T14:00:13+02:00 Video_1_Evidence for Size-Selective Predation by Antarctic Humpback Whales.MP4 David E. Cade (3804661) Shirel R. Kahane-Rapport (12022253) Ben Wallis (12022256) Jeremy A. Goldbogen (9511632) Ari S. Friedlaender (7359047) 2022-01-31T04:56:25Z https://doi.org/10.3389/fmars.2022.747788.s001 unknown https://figshare.com/articles/media/Video_1_Evidence_for_Size-Selective_Predation_by_Antarctic_Humpback_Whales_MP4/19095035 doi:10.3389/fmars.2022.747788.s001 CC BY 4.0 CC-BY Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Antarctic krill dB differencing fisheries acoustics bio-logging whale scale bubble-net forging deep diving habitat selection Dataset Media 2022 ftsmithonian https://doi.org/10.3389/fmars.2022.747788.s001 2022-02-07T17:05:41Z Animals aggregate around resource hotspots, but what makes one resource more appealing than another can be difficult to determine. In March 2020 the Antarctic fjord Charlotte Bay included >5× as many humpback whales as neighboring Wilhelmina Bay, a site previously known for super aggregations of whales and their prey, Antarctic krill. We used suction-cup attached bio-logging tags and active acoustic prey mapping to test the hypothesis that whale abundance in Charlotte Bay would be associated with higher prey biomass density, and that whale foraging effort would be concentrated in regions of Charlotte Bay with the highest biomass. Here we show, however, that patch size and krill length at the depth of foraging were more likely predictors of foraging effort than biomass. Tagged whales spent >80% of the night foraging, and whales in both bays demonstrated similar nighttime feeding rates (48.1 ± 4.0 vs. 50.8 ± 16.4 lunges/h). However, whales in Charlotte Bay foraged for 58% of their daylight hours, compared to 22% in Wilhelmina Bay, utilizing deep (280–450 m) foraging dives in addition to surface feeding strategies like bubble-netting. Selective foraging on larger krill by humpback whales has not been previously established, but suggests that whales may be sensitive to differences in individual prey quality. The utilization of disparate foraging strategies in different parts of the water column allows humpback whales to target the most desirable parts of their foraging environments. Dataset Antarc* Antarctic Antarctic Krill Unknown Antarctic The Antarctic Wilhelmina ENVELOPE(-62.160,-62.160,-64.642,-64.642) Wilhelmina Bay ENVELOPE(-62.160,-62.160,-64.642,-64.642) Charlotte Bay ENVELOPE(-61.633,-61.633,-64.583,-64.583) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftsmithonian |
language |
unknown |
topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Antarctic krill dB differencing fisheries acoustics bio-logging whale scale bubble-net forging deep diving habitat selection |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Antarctic krill dB differencing fisheries acoustics bio-logging whale scale bubble-net forging deep diving habitat selection David E. Cade (3804661) Shirel R. Kahane-Rapport (12022253) Ben Wallis (12022256) Jeremy A. Goldbogen (9511632) Ari S. Friedlaender (7359047) Video_1_Evidence for Size-Selective Predation by Antarctic Humpback Whales.MP4 |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Antarctic krill dB differencing fisheries acoustics bio-logging whale scale bubble-net forging deep diving habitat selection |
description |
Animals aggregate around resource hotspots, but what makes one resource more appealing than another can be difficult to determine. In March 2020 the Antarctic fjord Charlotte Bay included >5× as many humpback whales as neighboring Wilhelmina Bay, a site previously known for super aggregations of whales and their prey, Antarctic krill. We used suction-cup attached bio-logging tags and active acoustic prey mapping to test the hypothesis that whale abundance in Charlotte Bay would be associated with higher prey biomass density, and that whale foraging effort would be concentrated in regions of Charlotte Bay with the highest biomass. Here we show, however, that patch size and krill length at the depth of foraging were more likely predictors of foraging effort than biomass. Tagged whales spent >80% of the night foraging, and whales in both bays demonstrated similar nighttime feeding rates (48.1 ± 4.0 vs. 50.8 ± 16.4 lunges/h). However, whales in Charlotte Bay foraged for 58% of their daylight hours, compared to 22% in Wilhelmina Bay, utilizing deep (280–450 m) foraging dives in addition to surface feeding strategies like bubble-netting. Selective foraging on larger krill by humpback whales has not been previously established, but suggests that whales may be sensitive to differences in individual prey quality. The utilization of disparate foraging strategies in different parts of the water column allows humpback whales to target the most desirable parts of their foraging environments. |
format |
Dataset |
author |
David E. Cade (3804661) Shirel R. Kahane-Rapport (12022253) Ben Wallis (12022256) Jeremy A. Goldbogen (9511632) Ari S. Friedlaender (7359047) |
author_facet |
David E. Cade (3804661) Shirel R. Kahane-Rapport (12022253) Ben Wallis (12022256) Jeremy A. Goldbogen (9511632) Ari S. Friedlaender (7359047) |
author_sort |
David E. Cade (3804661) |
title |
Video_1_Evidence for Size-Selective Predation by Antarctic Humpback Whales.MP4 |
title_short |
Video_1_Evidence for Size-Selective Predation by Antarctic Humpback Whales.MP4 |
title_full |
Video_1_Evidence for Size-Selective Predation by Antarctic Humpback Whales.MP4 |
title_fullStr |
Video_1_Evidence for Size-Selective Predation by Antarctic Humpback Whales.MP4 |
title_full_unstemmed |
Video_1_Evidence for Size-Selective Predation by Antarctic Humpback Whales.MP4 |
title_sort |
video_1_evidence for size-selective predation by antarctic humpback whales.mp4 |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.747788.s001 |
long_lat |
ENVELOPE(-62.160,-62.160,-64.642,-64.642) ENVELOPE(-62.160,-62.160,-64.642,-64.642) ENVELOPE(-61.633,-61.633,-64.583,-64.583) |
geographic |
Antarctic The Antarctic Wilhelmina Wilhelmina Bay Charlotte Bay |
geographic_facet |
Antarctic The Antarctic Wilhelmina Wilhelmina Bay Charlotte Bay |
genre |
Antarc* Antarctic Antarctic Krill |
genre_facet |
Antarc* Antarctic Antarctic Krill |
op_relation |
https://figshare.com/articles/media/Video_1_Evidence_for_Size-Selective_Predation_by_Antarctic_Humpback_Whales_MP4/19095035 doi:10.3389/fmars.2022.747788.s001 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2022.747788.s001 |
_version_ |
1766269223074529280 |