Deep-diving foraging behaviour of the sperm whale, Physeter macrocephalus

S. Watwood, Patrick Miller, Mark Johnson, P. T. Madsen, Peter Lloyd Tyack

Research output: Contribution to journalArticlepeer-review

318 Citations (Scopus)

Abstract

Digital tags were used to describe diving and vocal behaviour of sperm whales during 198 complete and partial foraging dives made by 37 individual sperm whales in the Atlantic Ocean, the Gulf of Mexico and the Ligurian Sea.

The maximum depth of dive averaged by individual differed across the three regions and was 985 m (SD = 124.3), 644 m (123.4) and 827 m (60.3), respectively. An average dive cycle consisted of a 45 min (6.3) dive with a 9 min (3.0) surface interval, with no significant differences among regions. On average, whales spent greater than 72% of their time in foraging dive cycles.

Whales produced regular clicks for 81% (4.1) of a dive and 64% (14.6) of the descent phase. The occurrence of buzz vocalizations (also called 'creaks') as an indicator of the foraging phase of a dive showed no difference in mean prey capture attempts per dive between regions [18 buzzes/dive (7.6)]. Sperm whales descended a mean of 392 m (144) from the start of regular clicking to the first buzz, which supports the hypothesis that regular clicks function as a long-range biosonar.

There were no significant differences in the duration of the foraging phase [28 min (6.0)] or percentage of the dive duration in the foraging phase [62% (7.3)] between the three regions, with an overall average proportion of time spent actively encountering prey during dive cycles of 0.53 (0.05). Whales maintained their time in the foraging phase by decreasing transit time for deeper foraging dives.

Similarity in foraging behaviour in the three regions and high diving efficiencies suggest that the success of sperm whales as mesopelagic predators is due in part to long-range echolocation of deep prey patches, efficient locomotion and a large aerobic capacity during diving.

Original languageEnglish
Pages (from-to)814-825
Number of pages12
JournalJournal of Animal Ecology
Volume75
Issue number3
DOIs
Publication statusPublished - May 2006

Keywords

  • diving behaviour
  • echolocation
  • foraging behaviour
  • Physeter macrocephalus
  • sperm whales
  • MARINE MAMMALS
  • ROCKHOPPER PENGUINS
  • WEDDELL SEALS
  • SEASONAL-CHANGES
  • ECHOLOCATION
  • CLICKS
  • DIET
  • VOCALIZATIONS
  • UNDERWATER
  • BUOYANCY

Fingerprint

Dive into the research topics of 'Deep-diving foraging behaviour of the sperm whale, Physeter macrocephalus'. Together they form a unique fingerprint.

Cite this