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Zooplankton feeding on algae and bacteria under ice in Lake Druzhby, East Antarctica

Author:
  • Christin Säwström
  • Jan Karlsson
  • Johanna Laybourn-Parry
  • Wilhelm Granéli
Publishing year: 2009
Language: English
Pages: 1195-1202
Publication/Series: Polar Biology
Volume: 32
Issue: 8
Document type: Journal article
Publisher: Springer

Abstract english

The feeding of the cladoceran Daphniopsis studeri on algae and bacteria was investigated under ice in an ultra-oligotrophic Antarctic lake from late autumn (May) to early spring (October) in 2004. D. studeri fed on both algae and bacteria with estimated filtering rates of 0.048 and 0.061 l ind(-1) day(-1)), respectively. Algae seemed to be the major food resource for the D. studeri population, however at times of low algal densities the bacterioplankton represented an important alternative food resource. The D. studeri grazing impact on the algal and bacterial standing stock was in general low (0.6-4.6% removed per day), but during the winter period this organism can remove up to 34% of the bacterial production (BP). At times D. studeri grazing can temporarily have a significant impact on the BP rates, though their impact was relatively low when compared to viral-induced bacterial mortality in the lake.

Keywords

  • Ecology
  • Zooplankton
  • Algae
  • Antarctic lake
  • Bacteria
  • Feeding rates

Other

Published
  • ISSN: 1432-2056
Wilhelm Granéli
E-mail: wilhelm [dot] graneli [at] biol [dot] lu [dot] se

Professor emeritus

Aquatic ecology

+46 70 279 82 34

E-D123

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