In situ observations of trophic behaviour and locomotion of Princaxelia amphipods (Crustacea: Pardaliscidae) at hadal depths in four West Pacific trenches

Alan J. Jamieson, Anne Nina Lörz, Toyonobu Fujii, Imants G. Priede

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The genus Princaxelia, Pardaliscidae, is a rarely recorded, infrequently collected and hitherto observed benthic amphipod, typically found at hadal depths (>6000 m) in the Pacific Ocean trenches. Little is known about the behaviour or physiology of this genus. Using a baited camera lander, observations of Princaxelia jamiesoni were made in the Japan Trench (7703 m) and Izu- Ogasawara Trench (9316 m) and of Princaxelia aff. abyssalis in the Kermadec Trench (7966 m) and Tonga Trench (8798 m). These amphipods rapidly intercepted the bait and preyed upon smaller lysianassoid amphipods. Mean absolute swimming speeds for P. jamiesoni and P. aff. abyssalis were 4.16 cm.s -1 ± 1.8 SD and 4.02 cm.s -1 ± 0.87 SD respectively. These amphipods have the capacity for long range swimming, high manoeuvrability in close range, and efficient predatory behaviour. Burst swimming speeds for P. aff. abyssalis were 9 and 10 cm.s -1 with accelerations up to 22-25 cm.s -2.

Original languageEnglish
Pages (from-to)143-150
Number of pages8
JournalJournal of the Marine Biological Association of the United Kingdom
Volume92
Issue number1
DOIs
Publication statusPublished - 2012 Feb
Externally publishedYes

Keywords

  • Amphipoda
  • Pacific Ocean
  • Pardaliscidae
  • Princaxelia
  • hadal zone
  • in situ observations
  • trophic niche

ASJC Scopus subject areas

  • Aquatic Science

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