Macrofaunal shallow benthic communities along a discontinuous annual cycle at Admiralty Bay,King George Island,Antarctica |
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| Authors: | Email author" target="_blank">C?A?EcheverríaEmail author P?C?Paiva |
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| Institution: | 1.Laboratório de Polychaeta, Depto. de Zoologia,Universidade Federal do Rio de Janeiro,Ilha do Fund?o, Rio de Janeiro,Brasil |
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| Abstract: | Temporal variations in composition and density of the benthic macrofauna at two stations (12 and 25 m depth) were studied
in Admiralty Bay, King George Island, Antarctica. Samples where carried out using an van Veen sampler between March and December
1999 (winter) and December 2000 and March 2001 (summer), comprising a discontinuous annual cycle. Sediment organic matter
showed a marked seasonal cycle, with lowest values at middle winter. Communities showed little variations in density and composition.
Temporal variations were not detected at 25 m depth. Variations at 12 m were related to one iceberg impact and to wind generated
hydrodinamism, as a function of wind direction, intensity and fetch. As winter scarcity of primary production did not seem
to affect macrofaunal community densities, nutrient availability for the benthos in winter can be related to the remineralization
of sediment organic matter by bacterial activity.
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