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http://dspace.mediu.edu.my:8181/xmlui/handle/1957/6287| Title: | The Influence of grazing on active γ-Proteobacteria cells |
| Authors: | Sherr, Barry |
| Keywords: | γ-Proteobacteria Metabolic activity |
| Issue Date: | 16-Oct-2013 |
| Description: | By identifying the relationships between abundance and metabolic activity in a bacterial community, we advance our knowledge of the marine carbon cycle. In the present study, our goal was to examine the role of protist grazing on the metabolic activity of γ- Proteobacteria in the upwelling system off the Oregon coast. Metabolically active γ- Proteobacteria were identified and quantified by a technique which combines microautoradiography and fluorescence in situ hybridization. The experiment consisted of three treatments: a control, a cubitainer filtered to enhance the effects of grazing, and a cubitainer filtered to reduce the grazing pressure on heterotrophic cells. In the three treatments, changes in the γ-Proteobacteria population were independent of the entire bacterial community. We found different γ-Proteobacteria population patterns in each experimental treatment at the beginning and over the course of a 2 day incubation. In the reduced grazing environment, the increase in γ-Proteobacteria abundance was 11 times greater than the increase in the enhanced grazing environment. This suggests that γ-Proteobacteria are vulnerable to grazing pressures. Additionally, our data suggest that metabolically active γ-Proteobacteria were targeted by grazing protists. Understanding the marine microbial communities through which carbon flows depends upon further defining the relationships between grazers and specific phylogenetic bacterial groups. |
| URI: | http://koha.mediu.edu.my:8181/xmlui/handle/1957/6287 |
| Other Identifiers: | http://hdl.handle.net/1957/6287 |
| Appears in Collections: | ScholarsArchive@OSU |
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