Effects of antibiotics on the microbial arsenic cycle in aquatic environments

2014 Fiscal Year Final Research Report

• Project/Area Number: 23681005
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Environmental dynamic analysis
• Research Institution: National Institute for Environmental Studies
• Principal Investigator: YAMAMURA Shigeki 独立行政法人国立環境研究所, 地域環境研究センター, 主任研究員 (90414391)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: ヒ素 / 環境動態 / 抗生物質 / 耐性細菌 / ヒ酸塩 / 亜ヒ酸塩

Outline of Final Research Achievements

We investigated the effects of antibiotics on microbial arsenate (As(V)) reduction and arsenite (As(III)) oxidation in sediments collected from a small pond and a eutrophic lake. The As(V)-reducing activities were less susceptible to chloramphenicol in aerobic conditions than in anaerobic conditions. Aerobic As(V) reduction proceeded in the presence of diverse types of antibiotics. In contrast, some antibiotics strongly inhibited aerobic As(III) oxidation. These results indicate that the aerobic As(III) oxidizers in the sediment are more sensitive to certain types of antibiotics than the aerobic As(V) reducers. Our results suggest that antibiotic disturbance of environmental microbial communities affects the biogeochemical cycle of As.

Free Research Field

環境工学、環境微生物学