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Release of dissolved free amino acids from biofilms in stream water

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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
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)
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)

Submitter: 上田 宏

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