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Abstract

Zooplankton samples taken in February and March 1981 in the southern Drake Passage and the Bransfield Strait revealed distinct differences between animal communities inhabiting water masses of different origin and of different physico-chemical properties. The West Wind Drift waters of the Drake Passage were rich in zooplankton; they were characterized by a high abundance of Radiolaria and young Limacina sp., the constant occurrence of Rhincalanus gigas, a significant share of Clausocalanus sp. and Calanoides acutus. On the other hand the above mentioned forms were nearly absent or scarce in the much poorer waters adjacent to South Shetland Islands and especially waters of the Bransfield Strait where such copepods like Metridia gerlachei and Oncaea curvata dominated or at least played a significant role being rare and scarce or absent in the Drake Passage. This picture was especially clear in the upper 100 m water layer, whereas in the deeper layer (300-100 m) these quantitative and qualitative differences were less obvious.

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Authors and Affiliations

Krzysztof Jażdżewski
Wojciech Kittel
Krzysztof Łotocki

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