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Abundance and biomass estimates of the benthic fauna in Admiralty Bay, King George Island, South Shetland Islands

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Summary

Quantitative benthic samples were collected along three transects in Admiralty Bay, King George Island, South Shetlands. At each of a total of 18 stations, between 15 and 250 m depth, we took 3 replicate samples with a van Veen grab. Animals collected were classed into major groups. Abundance and biomass per m2 was calculated for each sampling site. Considerable population densities and high biomass values were found. Most abundant groups were Bivalvia, Polychaeta and Amphipoda, whereas the largest part of the biomass was due to Ascidiacea, Ophiuroidea, Echinoidea, Polychaeta and Bivalvia. The maximum abundance recorded was 36,000 ind m-2 while the average was approximately 6500 ind m-2. Maximum biomass was over 2400 g m-2 with an average of ca. 700 g m-2. The contribution to the total biomass by groups such as the Oligochaeta, Cumacea and Tanaidacea was higher in the inner shallow part of Admiralty Bay (Ezcurra Inlet) than in the deeper areas of the bay. Our results confirm the reports on an unusually high density and biomass of the Antarctic sublittoral benthic fauna. Sessile suspension feeders belonging to the Bivalvia, Ascidiacea, sedentary Polychaeta, and vagile scavengers of the Ophiuroidea, Amphipoda and errant Polychaeta are the most significant groups in the Antarctic Ecosystem. The total benthic biomass in Admiralty Bay, based on the present preliminary quantitative data, was estimated to be over 600,000 t. This value is probably still an underestimate.

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Authors and Affiliations

  1. Laboratory of Polar Biology, Department of General Zoology, Institute of Environmental Biology, University of Łódź, Łódź, Poland

    K. Jażdżeski, W. Jurasz, W. Kittel, E. Presler, P. Presler & J. Siciński

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  1. K. Jażdżeski
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  2. W. Jurasz
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  3. W. Kittel
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  4. E. Presler
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  5. P. Presler
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  6. J. Siciński
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Jażdżeski, K., Jurasz, W., Kittel, W. et al. Abundance and biomass estimates of the benthic fauna in Admiralty Bay, King George Island, South Shetland Islands. Polar Biol 6, 5–16 (1986). https://doi.org/10.1007/BF00446235

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