Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)
Online ISSN : 2185-467X
ISSN-L : 2185-467X
Annual Journal of Hydraulic Engineering, JSCE, Vol.60
ASSESSMENT OF RIVER ENVIRONMENT BASED ON CARBON AND NITROGEN STABLE ISOTOPE RATIOS OF BENTHIC FAUNA IN THE FIRST CLASS RIVERS OF CHUGOKU DISTRICT
Yoshihisa AKAMATSURyutei INUISyohei MUTSUTAAkihiro HITOTSUMATSU
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2016 Volume 72 Issue 4 Pages I_985-I_990

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Abstract
 In this study, a new assessment of river environment using benthic fauna is proposed. Field observations for the samplings of water quality and benthic fauna were conducted at 5~12 points in the ten first-class rivers of Chugoku district. As a result, there wasn't any significant correlation relationship among the water quality (T-N) and the stable isotope ratios of nitrogen (δ15 N) in benthic fauna. However, δ15 N in benthic fauna have a clear relation with the land use ratio of urban and farm area in the catchment for each sampling point which was estimated using GIS analysis. This result indicates that the δ15 N in benthic fauna can be an indicator of the river environment.
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© 2016 Japan Society of Civil Engineers
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