Attached and free-liviing dividing bacteria in two aquatic systems |
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| Authors: | J Iriberri M Unanue B Ayo I Barcina L Egea |
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| Institution: | Departmento de Microbiología e Inmunología, Facultad de Ciencias, Universidad del País Vasco, Apdo. 644, E-48080, Bilbao, Spain |
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| Abstract: | The percentage of dividing biomass was calculated for attached and free-living bacteria, in a coastal marine and a freshwater system. In the marine system with low concentrations of total and dissolved organic carbon (TOC and DOC) the percentage of dividing biomass was higher for attached (41.4 ± 13.9) than for the free-living bacteria (22.0 ± 11.7). However, in the freshwater system, which had a higher concentration of TOC and DOC, the percentage of dividing biomass was similar for both communities-attached (53.4 ± 26.5) and free-living (78.4 ± 21.9). Thus the attachment to particulate material is not necessarily an advantage in waters where dissolved organic nutrients are readily available. |
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