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Response of Antarctic benthic communities to disturbance: first results from the artificial Benthic Disturbance Experiment on the eastern Weddell Sea Shelf, Antarctica

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Abstract

The long-term benthic disturbance experiment (BENDEX) was started on the eastern Weddell Sea shelf off Austasen (Antarctica) during ‘Polarstern’ cruise ANT XXI/2 in December 2003 to simulate the impact of grounding icebergs on the seabed and follow the steps and timescales of recovery of disturbed benthos and demersal fish communities. Here, we report the basic approach and first results for this experimental field study. By means of 11 densely-placed hauls with a modified bottom trawl, a seabed area of approximately 100 × 1000 m was artificially scoured to inflict a similar damage to the benthic habitats as a grounding iceberg. Before the disturbance event and 11 days after it, the seafloor communities were sampled (invertebrate assemblages by multibox corers, the fish fauna by trawl hauls) and comparatively analyzed. Sediment texture and chemistry was not significantly altered by the heavy disturbance inflicted by repeated trawling, whereas the fauna was negatively affected. Invertebrate benthic biomass was drastically reduced by a factor of 10, while mean abundances were only slightly reduced. Demersal fish biomass and abundance were slightly but not significantly smaller after the disturbance. Effects of disturbance became more evident in the composition of the fish fauna, with Trematomus pennelli and T. hansoni being dominant at disturbed sites, whereas Chionodraco myersi was the dominant species in trawl catches from undisturbed stations.

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Acknowledgments

Thanks are due to the crew of RV POLARSTERN for help and assistance on sea and to unknown reviewers for helpful comments on the manuscript. We are thankful to D. Piepenburg and a second unknown reviewer for substantial improvement of the manuscript.

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Authors and Affiliations

  1. Alfred-Wegener-Institute for Polar- and Marine Research, Columbusstr, 27568, Bremerhaven, Germany

    D. Gerdes, R. Knust & K. Mintenbeck

  2. Institut de Ciències del Mar-CSIC, Passeig Marítim de la Barceloneta 37-49, 08003, Barcelona, Spain

    E. Isla & S. Rossi

Authors
  1. D. Gerdes
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  2. E. Isla
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  3. R. Knust
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  4. K. Mintenbeck
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  5. S. Rossi
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Correspondence to D. Gerdes.

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Gerdes, D., Isla, E., Knust, R. et al. Response of Antarctic benthic communities to disturbance: first results from the artificial Benthic Disturbance Experiment on the eastern Weddell Sea Shelf, Antarctica. Polar Biol 31, 1469–1480 (2008). https://doi.org/10.1007/s00300-008-0488-y

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  • DOI: https://doi.org/10.1007/s00300-008-0488-y

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