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Conference Paper

Chemostats used to model the microbial food web: evidence for the feedback effect of herbivorous metazoans

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Arndt,  Hartmut
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Rothhaupt,  Karl Otto
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Citation

Arndt, H., Güde, H., Macek, M., & Rothhaupt, K. O. (1992). Chemostats used to model the microbial food web: evidence for the feedback effect of herbivorous metazoans.


Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-E468-8
Abstract
Five successive chemostats of algae (Monoraphidium )/bacteria, a heterotrophic flagellate (Spumella ), and a rotifer (Brachionus ) were combined according to a trophic cascade in order to test the hypothesis that the main flux of DOC from phytoplankton to bacteria is via egestion and excretion by herbivores rather than via exudated DOC from intact algae. Laboratory experiments revealed that bacteria and protozoans remained at low concentrations and metabolic activities until the algae were damaged by rotifer grazing. In the last chemostat where rotifers had been removed microbes grew up even more indicating both fuelling and grazing of microbes by rotifers. Evidence is presented that grazing activity of herbivores should be considered as an important source of microbial nutrition.