Journal
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
Volume 48, Issue 16, Pages 3401-3410Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0967-0645(01)00048-0
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To assess the possible effect of nodule mining on deep-sea environment, the Indian deep-sea environment experiment (INDEX) was undertaken in the Indian Basin. The present investigation is a part of the disturbance and recolonization study. Pre- and post-disturbance sediment samples were collected from 21 stations between 10 degrees 01 ' -10 degrees 03 'S and 75 degrees 59 ' -76 degrees 02 'E at water depths of 5300-5350 m to assess the effect of benthic disturbance. There was a significant change in the composition and biomass of macrofauna after the disturbance. Post-disturbance vertical profiles indicated a 63% reduction in the numerical count in the top 0-2-cm layer and high aggregation of macrofauna in deeper (5-10-cm) sediment layer. The impact of the disturbance was severe, as the mean biomass of macrofauna was significantly reduced in the disturbed area, probably due to the displacement and /or mortality caused by the benthic disturber. (C) 2001 Elsevier Science Ltd. All rights reserved.
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