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JPR Advance Access originally published online on September 9, 2009
Journal of Plankton Research 2009 31(11):1373-1383; doi:10.1093/plankt/fbp081
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© The Author 2009. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Changes in marine prokaryotic community induced by varying types of dissolved organic matter and subsequent grazing pressure

Laura Alonso-Sáez1,2, Marian Unanue2,*, Ainhoa Latatu2, Iñigo Azua2, Begoña Ayo2, Itxaso Artolozaga2 and Juan Iriberri2

1 Department of Ecology and Evolution, Limnology, Uppsala University, Norbyvagen 18D, SE-75236 Uppsala, Sweden 2 Departamento de Inmunología, Microbiología y Parasitología, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apdo. 644, E 48080 Bilbao, Spain

* CORRESPONDING AUTHOR: marian.unanue{at}ehu.es

Received on December 29, 2008; accepted on August 14, 2009


  Abstract

We analysed changes in the abundance, biomass, activity and composition of coastal marine prokaryotic communities after the addition of organic substrates, such as glucose, leucine and yeast extract, and the effect of grazing pressure exerted by nanoflagellates. The addition of a carbon source (i.e. glucose) promoted the growth of Gammaproteobacteria, while a combined source of C and N (i.e. leucine) favoured the development of Alphaproteobacteria. The addition of yeast extract, a complex substrate rich in N and growth factors, promoted the proliferation of Alphaproteobacteria and Gammaproteobacteria. Grazing pressure exerted by nanoflagellates produced marked differences on the size structure of the prokaryotic biomass. A pronounced tendency to filamentation and aggregation was observed in the glucose treatment, while in the case of yeast extract, small and mainly freely dispersed prokaryotes were maintained throughout the incubations. Thus, the final community in the yeast extract treatment showed a high percentage of edible biomass, while an important fraction of potentially grazing-resistant prokaryotes (more than 50% of total prokaryotic biomass) was detected in the microcosms enriched with glucose. These results suggest a marked effect of DOM sources on the development of grazing-resistant prokaryotes.

Corresponding editor: John Dolan


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