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Release of dissolved free amino acids from biofilms in stream water
| Title: | Release of dissolved free amino acids from biofilms in stream water |
| Authors: | Ishizawa, Sayaka Browse this author | | Yamamoto, Yuzo Browse this author | | Denboh, Takashi Browse this author | | Ueda, Hiroshi Browse this author |
| Keywords: | Dissolved free amino acids | | Biofilm | | Epilithic algae | | Salmon homing | | Toyohira River |
| Issue Date: | Jul-2010 |
| Publisher: | Springer Japan |
| Journal Title: | Fisheries Science |
| Volume: | 76 |
| Issue: | 4 |
| Start Page: | 669 |
| End Page: | 676 |
| Publisher DOI: | 10.1007/s12562-010-0246-2 |
| Abstract: | We investigated the origin of dissolved free amino acids (DFAA) in stream water focusing on biofilms in the river bed by means of incubation experiments in the laboratory. Stones were placed in the Toyohira River, Hokkaido, Japan, for 3 months, allowing formation of biofilms, and then incubated for 24 hours in the laboratory at stream water temperature. After incubation, the composition and concentrations of DFAA in the incubation solution and total hydrolyzed amino acids (THAA) in biofilms were measured by high-performance liquid chromatography. The amount of chlorophyll a (Chl. a) and the number of bacteria were also measured. The DFAA concentration increased greatly in the biofilm incubation solution, but the DFAA composition (mole %) did not change relative to the inception of incubation, where it was similar to stream water. There was no correlation between the increase in DFAA concentration and the THAA concentration, Chl. a amount, or the number of bacteria in biofilms. These results suggest that biofilms are one of the major sources of DFAA in stream water. |
| Rights: | © 2010 公益社団法人日本水産学会 | | © 2010 The Japanese Society of Fisheries Science |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/44028 |
| Appears in Collections: | 北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 上田 宏
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