Present address: Department of Zoology, Natural History Museum, Cromwell Road, London SW7 5BD, UK.
Closely related protist strains have different grazing impacts on natural bacterial communities
Article first published online: 29 JUN 2010
© 2010 Society for Applied Microbiology and Blackwell Publishing Ltd
Volume 12, Issue 12, pages 3105–3113, December 2010
How to Cite
Glücksman, E., Bell, T., Griffiths, R. I. and Bass, D. (2010), Closely related protist strains have different grazing impacts on natural bacterial communities. Environmental Microbiology, 12: 3105–3113. doi: 10.1111/j.1462-2920.2010.02283.x
- Issue published online: 3 DEC 2010
- Article first published online: 29 JUN 2010
- Received 8 March, 2010; accepted 11 May, 2010.
Heterotrophic protists are abundant in most environments and exert a strong top-down control on bacterial communities. However, little is known about how selective most protists are with respect to their bacterial prey. We conducted feeding trials using cercomonad and glissomonad Cercozoa by assaying them on a standardized, diverse bacterial community washed from beech leaf litter. For each of the nine protist strains assayed here, we measured several phenotypic traits (cell volume, speed, plasticity and protist cell density) that we anticipated would be important for their feeding ecology. We also estimated the genetic relatedness of the strains based on the 18S rRNA gene. We found that the nine protist strains had significantly different impacts on both the abundance and the composition of the bacterial communities. Both the phylogenetic distance between protist strains and differences in protist strain traits were important in explaining variation in the bacterial communities. Of the morphological traits that we investigated, protist cell volume and morphological plasticity (the extent to which cells showed amoeboid cell shape flexibility) were most important in determining bacterial community composition. The results demonstrate that closely related and morphologically similar protist species can have different impacts on their prey base.