Marine Biology

, Volume 136, Issue 3, pp 519–530

Effects of simulated deposition of dredged material on structure of nematode assemblages – the role of burial

  • M. Schratzberger
  • H. L. Rees
  • S. E. Boyd

DOI: 10.1007/s002270050712

Cite this article as:
Schratzberger, M., Rees, H. & Boyd, S. Marine Biology (2000) 136: 519. doi:10.1007/s002270050712

Abstract

A microcosm experiment was designed to evaluate the effects of the simulated deposition of uncontaminated dredged material on nematode assemblages from estuarine intertidal mud. The main objective was to assess the ability of nematodes to migrate vertically into native muddy and non-native sandy sediment deposited in different amounts and frequencies. Results from univariate and graphical methods of data-evaluation revealed that nematodes were capable of migrating over a wide depth range from the bottom mud layer into the top layer of deposited sand and mud. A diverse mud assemblage of nematodes was able to survive in non-native fine sand for the experimental period of 2 mo. Multivariate analyses showed that the amount of deposit and the frequency of deposition were interactive factors. A high amount of sediment deposited once at the beginning of the experiment caused more severe changes in assemblage structure than the same amount deposited in more frequent but smaller doses. The response of most species to the experimental treatments appeared to be an integrated response to the enhancing effect of food input accompanying the deposit and the negative effect of burial. Upward migration of nematodes is a process which has often been underestimated in its importance for recolonisation of areas where uncontaminated dredged material is deposited. Active migration of nematodes can significantly affect the recovery of a dredgings disposal site.

Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • M. Schratzberger
    • 1
  • H. L. Rees
    • 2
  • S. E. Boyd
    • 2
  1. 1.University of Wales Bangor, School of Ocean Sciences, Menai Bridge LL59 5EY, Gwynedd, North Wales, Great BritainGB
  2. 2.The Centre for Environment, Fisheries and Aquaculture Science, Burnham Laboratory, Remembrance Avenue, Burnham-on-Crouch CM0 8HA, Essex, England Fax: 0044 (0)1621 784989 e-mail: m.schratzberger@cefas.co.ukGB

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