期刊
MARINE ECOLOGY PROGRESS SERIES
卷 523, 期 -, 页码 233-241出版社
INTER-RESEARCH
DOI: 10.3354/meps11141
关键词
Animal-borne camera; Cetacean; Data logger; Diving behavior; Hunting; Swim speed; Physeter macrocephalus
资金
- Canon Foundation
- Japan Society for Promotion of Science (JSPS)
- JSPS Postdoctoral Fellowships for Research Abroad
- Sasagawa Scientific Research Grant from the Japan Science Society
- program 'Bio-Logging Science of the University of Tokyo (UTBLS)'
- Grants-in-Aid for Scientific Research [25660152, 25281008] Funding Source: KAKEN
It is hypothesized that sperm whales employ active pursuit strategies for hunting prey, mainly deep-sea squid at great depths, but no visual evidence has been obtained to confirm this. We recorded the hunting behavior of sperm whales using animal-borne cameras and accelerometers simultaneously deployed on 17 whales, and obtained 42.8 h of diving data, including 17 715 images. A statistical comparison indicated no clear effect of light (with or without flashing white lights from cameras) on diving behavior of tagged whales. Although 98.5% of the still images were of empty water and uninformative, 5 classes of images with visible material were identified: (1) suspended material, possibly squid ink (n = 17), (2) unidentified particles (n = 4), (3) possible animal body parts (n = 2), (4) other sperm whales (n = 221), and (5) the seafloor (n = 8). All image classes were recorded at deeper depths (mean +/- SD = 785 +/- 140 m), except Class 4 images, which were recorded only at depths < 339 m, suggesting that tagged whales swam alone while foraging at great depths. Simultaneous use of speed and image sensors revealed that Class 1 images were associated with bursts of speed up to approximately twice (3.3 +/- 1.0 m s(-1), max. 6 m s(-1)) the mean swim speed (1.8 +/- 0.4 m s(-1)). These images, likely derived during chasing prey, support the hypothesis that sperm whales actively hunt to capture prey.
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