Amphipods on a deep-sea hydrothermal treadmill

S. Kaartvedt*, C. L. Van Dover, L. S. Mullineaux, P. H. Wiebe, S. M. Bollens

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Conspicuous swarms of a pardaliscid amphipod were observed at about 2520 and 2580 m depth in the East Pacific Rise vent field during dives with the submersible Alvin. Swarms occurred in association with mussels, clams and tubeworms, and were located above, and immediately downstream of cracks with emanating hydrothermal water. Numerical density sometimes exceeded 1000 individuals 1-1, which is 3 orders of magnitude greater than any previous report on pelagic crustaceans from the deep sea. The amphipods, however, were not obligatory swarmers, and thin-layered shoals and scattered individuals were observed. Orientation of individuals was often polarized as they headed into the venting flow, swimming vigorously at 5-10 cm s-1 to maintain their position in the current. Retention within the preferred habitat requires an average swimming speed corresponding to the average current speed, suggesting a sustained swimming of > 10 body lengths s-1. These observations contrast with the general concept of low swimming activity in deep-sea crustaceans.

Original languageEnglish (US)
Pages (from-to)179-195
Number of pages17
JournalDeep-Sea Research Part I
Volume41
Issue number1
DOIs
StatePublished - 1994
Externally publishedYes

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

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