Locomotory activity and feeding strategy of the hadal munnopsid isopod Rectisura cf. herculea (Crustacea: Asellota) in the Japan Trench

Alan J. Jamieson, Toyonobu Fujii, Imants G. Priede

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Benthic fauna in the hadal zone (6500-11,000 m) rely on maintaining sufficient locomotory activity to exploit a low, patchy and uniquely distributed food supply while exposed to high pressure, low temperatures and responding to predator-prey interactions. Very little is currently known about the locomotory capabilities of hadal fauna. In situ video footage of the isopod Rectisura cf. herculea (Birstein 1957) (Asellota, Munnopsidae) was obtained from 6945 and 7703 m deep in the Japan Trench (NW Pacific Ocean). Measurements of locomotion revealed routine walking speeds of 0.19±0.04BLs-1 (mean ± s.d.), increasing to 0.33±0.04BLs-1 if naturally perturbed by larger organisms. When immediately threatened by the presence of predators (decapod crustaceans), the isopods are capable of eliciting backward escape jumps and burst swimming escape responses of 2.6±1.5 BLs -1 and 4.63±0.9 BLs-1, respectively. These data suggest no significant reduction in locomotory capability despite the extreme depths in which they inhabit. These observations also revealed the isopod to be a bait-attending and aggregative species and suggest that it may not be obligatorily selecting infaunal food sources as previously thought.

Original languageEnglish
Pages (from-to)3010-3017
Number of pages8
JournalJournal of Experimental Biology
Volume215
Issue number17
DOIs
Publication statusPublished - 2012 Sep
Externally publishedYes

Keywords

  • Feeding behaviour
  • Hadal zone
  • Isopoda
  • Locomotion
  • Trench fauna

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Physiology
  • Aquatic Science
  • Animal Science and Zoology
  • Molecular Biology
  • Insect Science

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