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

The feeding of the cladoceran Daphniopsisstuderi on algae and bacteria was investigated under ice in anultra-oligotrophic Antarctic lake from late autumn (May)to early spring (October) in 2004. D. studeri fed on both algaeand bacteria with estimated filtering rates of 0.048 and0.061 l ind-1 day-1),...

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Bibliographic Details
Published in:Polar Biology
Main Authors: Sawstrom, C, Karlsson, J, Laybourn-Parry, J, Graneli, W
Format: Article in Journal/Newspaper
Language:English
Published: Springer 2009
Subjects:
Biological Sciences
Microbiology
Microbial Ecology
Antarctic
East Antarctica
Lake Druzhby
Antarc*
Antarctica
Polar Biology
Online Access:http://www.springerlink.com
https://doi.org/10.1007/s00300-009-0619-0
http://ecite.utas.edu.au/57520
Description
Summary:The feeding of the cladoceran Daphniopsisstuderi on algae and bacteria was investigated under ice in anultra-oligotrophic Antarctic lake from late autumn (May)to early spring (October) in 2004. D. studeri fed on both algaeand bacteria with estimated filtering rates of 0.048 and0.061 l ind-1 day-1), respectively. Algae seemed to be themajor food resource for the D. studeri population, however attimes of low algal densities the bacterioplankton representedan important alternative food resource. The D. studerigrazing impact on the algal and bacterial standing stock wasin general low (0.64.6% removed per day), but during thewinter period this organism can remove up to 34% of thebacterial production (BP). At times D. studeri grazing cantemporarily have a significant impact on the BP rates, thoughtheir impact was relatively low when compared to viralinducedbacterial mortality in the lake.

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