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2016•Journal of Japan Society of Civil Engineers Ser B1 (Hydraulic Engineering)Open access

ASSESSMENT OF RIVER ENVIRONMENT BASED ON CARBON AND NITROGEN STABLE ISOTOPE RATIOS OF BENTHIC FAUNA IN THE FIRST CLASS RIVERS OF CHUGOKU DISTRICT

Yoshihisa AKAMATSU, Ryutei Inui, Syohei MUTSUTA, Akihiro HITOTSUMATSU

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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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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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Available 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.

Key concepts: Fauna, Benthic zone, Environmental science, Drainage basin, Water quality, Sampling (signal processing), Hydrology (agriculture), Ecology

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ASSESSMENT OF RIVER ENVIRONMENT BASED ON CARBON AND NITROGEN STABLE ISOTOPE RATIOS OF BENTHIC FAUNA IN THE FIRST CLASS RIVERS OF CHUGOKU DISTRICT — Research Paper | ScholarLens