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Applied and Environmental Microbiology, October 2004, p. 5787-5793, Vol. 70, No. 10
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.10.5787-5793.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Strain-Specific Differences in the Grazing Sensitivities of Closely Related Ultramicrobacteria Affiliated with the Polynucleobacter Cluster

Jens Boenigk,* Peter Stadler, Anneliese Wiedlroither, and Martin W. Hahn

Institute for Limnology, Austrian Academy of Sciences, Mondsee, Austria

Received 14 April 2004/ Accepted 9 June 2004

Ultramicrobacteria (cell volume < 0.1 µm3) are the numerically dominant organisms in the plankton of marine and freshwater habitats. Flagellates and other protists are assumed to be the most important predators of these ultramicrobacteria as well as of larger planktonic bacteria. However, due to controversial observations conducted previously, it is not clear as to whether fractions of the ultramicrobacteria are resistant to flagellate predation. Furthermore, it is not known if closely related bacteria vary significantly in their sensitivity to flagellate predation. We investigated the sensitivity of ultramicrobacteria affiliated with the cosmopolitan Polynucleobacter cluster to grazing by Spumella-like nanoflagellates. Laboratory grazing experiments with four closely related (≥99.6% 16S rRNA gene sequence similarity) bacteria and three closely related (100% 18S rRNA gene sequence similarity) flagellates were performed. In comparison to larger bacteria, predation on the ultramicrobacterial Polynucleobacter strains was weak, and the growth of the predating flagellates was slow. Specific clearance rates ranged between 0.14 x 105 and 2.8 x 105 units of predator size h–1. Feeding rates strongly depended on the flagellate and bacterial strain (P < 0.001). Grazing mortality rates of the three flagellate strains investigated varied for the same prey strain by up to almost fourfold. We conclude that (i) ultramicrobacteria affiliated with the Polynucleobacter cluster are not protected from grazing, (ii) strain-specific variations in grazing sensitivity even between closely related bacteria are high, and (iii) strain-specific differences in predator-prey interaction could be an important factor in the evolution and maintenance of microbial microdiversity.

* Corresponding author. Mailing address: Institute for Limnology, Austrian Academy of Sciences, Mondseestr. 9, A-5310 Mondsee, Austria. Phone: 43 6232 312529. Fax: 43 6232 3578. E-mail: jens.boenigk{at}oeaw.ac.at.

Applied and Environmental Microbiology, October 2004, p. 5787-5793, Vol. 70, No. 10
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.10.5787-5793.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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