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Marine Biology

, Volume 136, Issue 5, pp 901–911 | Cite as

Structure and function of Halice hesmonectes (Amphipoda: Pardaliscidae) swarms from hydrothermal vents in the eastern Pacific

  • M. Sheader
  • C. L. Van Dover
  • T. M. Shank

Abstract

Swarms of the pardaliscid amphipod Halice hesmonectes were sampled at low-temperature hydrothermal vents in the Venture Hydrothermal Fields of the East Pacific Rise. In excess of 3000 individuals were collected from a range of sites/habitats, and at two points in time (December 1991 and March 1994). The structure of swarms was described in terms of growth stages, the development of primary and secondary sex characteristics and the accumulation of nutritional reserves. The results demonstrated that swarms contained a wide range of growth stages, but that small juveniles and mature males and females were absent. Swarm structure was interpreted as an equilibrium dependent on the relative proportion of time spent by each growth stage in the swarm habitat. This equilibrium swarm structure was very similar at different sites and times. Swarms dominated by small juveniles occurred at the northern sites in December 1991 following a period of eruption and new venting in April 1991. Equilibrium swarm structure had become re-established at these sites by March 1994. The function of swarming was considered. The results indicated that swarming was not associated with reproductive activity. The available evidence, though not conclusive, suggested that swarms were associated with feeding.

Keywords

Growth Stage Relative Proportion Mature Male Reproductive Activity Hydrothermal Vent 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • M. Sheader
    • 1
  • C. L. Van Dover
    • 2
  • T. M. Shank
    • 3
  1. 1.School of Ocean & Earth Science, University of Southampton, Southampton Oceanography Centre, European Way, Southampton, SO14 3ZH, United KingdomGB
  2. 2.328 Millington Hall, Biology Department, College of William and Mary, Williamsburg, Virginia 23187, USAUS
  3. 3.Institute of Marine and Coastal Sciences, Rutgers, The State University of New Jersey, 71 Dudley Road, New Brunswick, New Jersey 08901-8521, USAUS

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