Forced into an ecological corner: round-the-clock deep foraging on small prey by elephant seals

Taiki Adachi*, Akinori Takahashi, Daniel P. Costa, Patrick W. Robinson, Luis A. Hückstädt, Sarah H. Peterson, Rachel R. Holser, Roxanne S. Beltran, Theresa R. Keates, Yasuhiko Naito

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Small mesopelagic fishes dominate the world’s total fish biomass, yet their ecological importance as prey for large marine animals is poorly understood. To reveal the little-known ecosystem dynamics, we identified prey, measured feeding events, and quantified the daily energy balance of 48 deep-diving elephant seals throughout their oceanic migrations by leveraging innovative technologies: animal-borne smart accelerometers and video cameras. Seals only attained positive energy balance after feeding 1000 to 2000 times per day on small fishes, which required continuous deep diving (80 to 100% of each day). Interspecies allometry suggests that female elephant seals have exceptional diving abilities relative to their body size, enabling them to exploit a unique foraging niche on small but abundant mesopelagic fish. This unique foraging niche requires extreme round-the-clock deep diving, limiting the behavioral plasticity of elephant seals to a changing mesopelagic ecosystem.
Original languageEnglish
Article numbereabg3628
Number of pages9
JournalScience Advances
Volume7
Issue number20
DOIs
Publication statusPublished - 12 May 2021

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