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Polar Biology

, Volume 32, Issue 8, pp 1195–1202 | Cite as

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

  • Christin Säwström
  • Jan Karlsson
  • Johanna Laybourn-Parry
  • Wilhelm Granéli
Original Paper

Abstract

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

Antarctic lake Bacteria Algae Zooplankton Feeding rates 

Notes

Acknowledgments

This work was funded by a Marie Curie Scholarship, the Australian Antarctic Division and Vetenskapsrådet (VR) the Swedish Research Council. We would like to thank the winter crew at Davis station, Antarctica 2004 for logistical support and field assistance. We also thank Ann-Kristin Bergström for help with the identification of the algal culture.

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Christin Säwström
    • 1
    • 4
  • Jan Karlsson
    • 1
  • Johanna Laybourn-Parry
    • 2
  • Wilhelm Granéli
    • 3
  1. 1.Climate Impacts Research Centre (CIRC), Department of Ecology and Environmental ScienceUmeå UniversityAbiskoSweden
  2. 2.The Institute for Antarctic and Southern Ocean StudiesUniversity of TasmaniaHobartAustralia
  3. 3.Department of LimnologyLund UniversityLundSweden
  4. 4.Australian Rivers InstituteGriffith UniversityNathanAustralia

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