Feeding characteristics and prey profitability in five herring-feeding killer whales (Orcinus orca) in northern Norway

Aimee F. Matika, Eve Jourdain*, David E. Cade, Richard Karoliussen, Philip S. Hammond

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

This study used multisensory data tags with integrated 4K video to investigate feeding behavior and prey profitability in five adult male killer whales (Orcinus orca) at herring wintering grounds in Norway, in 2016 and 2017. Video recorded two killer whales engaged in carousel feeding, and two engaged in seiner feeding (i.e., feeding on herring discards around purse seiner vessels). The feeding behaviors identified from the video data allowed for determination of associated kinematic signatures, which were used to further identify and characterize carousel feeding and deep feeding dives over the entire logger duration. Prey consumption during on camera feeding bouts was also measured to calculate profitability of feeding bouts for the different behaviors. Average number of prey consumed per minute was 1.08±0.43 for carousel feeding and 0.43±0.07 for seiner feeding (n = 122 prey capture events). Using kinematic data, a total of 18 carousel feeding bouts and 206 deep feeding dives were identified. Whales spent at least 37%-65% of time over 24-hr feeding. Using field metabolic rate estimates from the literature and the energetic content of herring caught locally, killer whales required an estimated 285-578 herring/day to balance daily energy requirements.
Original languageEnglish
Pages (from-to)1409-1424
Number of pages16
JournalMarine Mammal Science
Volume38
Issue number4
Early online date2 Apr 2022
DOIs
Publication statusPublished - 1 Oct 2022

Keywords

  • Energy budgets
  • Energy intake
  • Feeding behavior
  • Metabolic rate
  • Orcinus orca
  • Prey requirements

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