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

journal contribution
posted on 2023-05-16, 23:54 authored by Sawstrom, C, Karlsson, J, Laybourn-Parry, J, Graneli, W
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 viralinduced bacterial mortality in the lake.

History

Publication title

Polar Biology

Volume

32

Issue

online

Pagination

EJ

ISSN

0722-4060

Department/School

Institute for Marine and Antarctic Studies

Publisher

Springer

Place of publication

Germany

Rights statement

The original publication is available at www.springerlink.com

Repository Status

  • Restricted

Socio-economic Objectives

Assessment and management of coastal and estuarine ecosystems

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