Dissolved organic carbon released by zooplankton grazing activity-a high-quality substrate pool for bacteria

Experiments were designed to investigate whether processes related to zooplankton feeding have a positive effect on bacterial growth. Bacterial abundance and [3H]thymidine incorporation rates were followed in grazer-free batch cultures originally containing either Scenedesmus quadricauda or Rhodomon...

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Bibliographic Details
Published in:	Journal of plankton research Vol. 19; no. 1; pp. 97 - 111
Main Authors:	Hygum, Bent H., Petersen, Jørgen W., Søndergaard, Morten
Format:	Journal Article
Language:	English
Published:	Oxford Oxford University Press 01-01-1997
Subjects:	Animal and plant ecology Animal, plant and microbial ecology Bacteria Biological and medical sciences Daphnia cucullata Eudiaptomus graciloides Fresh water ecosystems Fundamental and applied biological sciences. Psychology Rhodomonas lacustris Scenedesmus quadricauda Synecology Denmark Scandinavia Europe Freshwater environment Dissolved organic carbon Excretion Organic matter Bacterioplankton Lakes Bacteria Nutrient Trophic relation Excreta Zooplankton
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Summary:	Experiments were designed to investigate whether processes related to zooplankton feeding have a positive effect on bacterial growth. Bacterial abundance and [3H]thymidine incorporation rates were followed in grazer-free batch cultures originally containing either Scenedesmus quadricauda or Rhodomonas lacustris as food sources, and Daphnia cucullata or Eudiaptomus graciloides as grazers. Compared with controls lacking either animals or algae, a significantly higher bacterial abundance and productivity occurred in cultures which contained both phyto- and zoo-plankton. The same experimental methodology was tested during the decline of a diatom spring bloom in a eutrophic, temperate lake. A significant increase in bacterial biomass was observed due to the grazing activity of in situ mesozooplankters during the clear-water phase. Our results demonstrated that the dissolved carbon pathway from mesozooplankton to bacteria averaged 57% (26–78%) of the algal carbon filtered from suspension.
Bibliography:	ark:/67375/HXZ-R5LMB6DZ-C ArticleID:19.1.97 istex:1F275C8483E1D2B16B9E177B9E9E3DE09AFF6853 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0142-7873 1464-3774
DOI:	10.1093/plankt/19.1.97