Abstract
Impacts of Cupriavidus necator KT1 on indigenous bacterial community in river water were examined by batch experiments. Three sets of river water samples, that contain strain KT1 of 1, 10, and 50% of total bacteria in river water, were prepared respectively. Changes of microbial community composition were analyzed. A control analysis was also conducted without KT1 addition. Only the 16S rRNA gene of strain KT1 added was decreased remarkably within 5 days. As a result, indigenous bacterial community composition was restored in a short time. A grazing experiment was carried out by using strain KT1. A high concentration of strain KT1 culture was added to a river water. A rapid decrease of strain KT1 was observed, and a flagellate was found to graze strain KT1. The flagellate may play an important role in preserving a natural ecosystem.
