INVESTIGATION OF VALVE OPENING-CLOSING RESPONSES OF BRACKISH WATER CLAM CORBICULA JAPONICA EXPOSED TO ENVIRONMENTAL STRESS / 環境ストレスに曝された汽水性二枚貝ヤマトシジミの開閉運動の評価
- Resource Type
- Journal Article
- Authors
- Jumpei SUZUKI; Masafumi FUJITA; Miki TSUCHIYAMA; Qingxu WU; 呉 青栩; 土山 美樹; 藤田 昌史; 鈴木 準平
- Source
- 土木学会論文集B2(海岸工学) / Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering). 2020, 76(2)1051
- Subject
- brackish water clam
hall element sensor
valve opening-closing response
wastewater
- Language
- Japanese
- ISSN
- 1883-8944
1884-2399
The present study developed the method of measurement and estimation of valve opening-closing responses in brackish clam Corbicula japonica using a hall element sensor in order to comprehensively understand biochemical- and individual-level responses against environmental stress. Using a relationship between hall element sensor–magnet distance and voltage for each individual, valve distance can be estimated. The clam exposed to municipal wastewater with 5× dilution showed that valve-movement frequency was increased (p<0.05) and valve-opening duaration was decreased (p<0.05), while valve-opening amplitude and valve-opening degree were not changed (p>0.05). We conclude that valve opening-closing responses can be a good individual-level indicator to assess the clam behavior exposed to environmental stress.