Zooplankton feeding on algae and bacteria under ice in Lake Druzhby,East Antarctica |
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Authors: | Christin Säwström Jan Karlsson Johanna Laybourn-Parry Wilhelm Granéli |
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Institution: | 1.Climate Impacts Research Centre (CIRC), Department of Ecology and Environmental Science,Ume? University,Abisko,Sweden;2.The Institute for Antarctic and Southern Ocean Studies,University of Tasmania,Hobart,Australia;3.Department of Limnology,Lund University,Lund,Sweden;4.Australian Rivers Institute,Griffith University,Nathan,Australia |
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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. |
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Keywords: | Antarctic lake Bacteria Algae Zooplankton Feeding rates |
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