title: The early warning of aquatic organophosphorus pesticide contamination by on-line monitoring behavioral changes of Daphnia magna.
abstract: In this paper, the movement behavior of Daphnia magna was studied as a bio-indicator of organophosphorous pesticide (OP) contamination, using an on-line bio-monitoring method, the Multispecies Freshwater Biomonitor. A static test of acute toxicity test revealed the 24-h and 48-h LC(50) values (95% confidence limit) for Daphnia magna to be respectively 0.45 microg/l and 0.21 microg/l for dipterex 3.80 microg/l and 0.90 microg/l for malathion, and 1.25 microg/l and 0.38 microg/l for parathion. The behavior strength of Daphnia magna was a sensitive indicator of sublethal OP stress and resulted in significant concentration-response relationships for the three OPs. Increasing OP concentration will result in more intensive behavioral responses of Daphnia magna and shorter response time, which could be described by the Stepwise Stress Model (SSM). Therefore movement behavior can be effectively applied in early warning of environment quality by on-line bio-monitoring. The intensive changes in behavior strength of Daphnia magna over a short time follow the SSM concept and can be used as an indicator of early stress response to OP accidental contamination.
authors.affiliation: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Science, P.O. Box 2871, Beijing 100085, People's Republic of China.
authors.forename: Zongming
authors.initials: Z
authors.lastname: Ren
authors.forename: Jinmiao
authors.initials: J
authors.lastname: Zha
authors.forename: Mei
authors.initials: M
authors.lastname: Ma
authors.forename: Zijian
authors.initials: Z
authors.lastname: Wang
authors.forename: Almut
authors.initials: A
authors.lastname: Gerhardt
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D002800:Cholinesterase Inhibitors / Q000633:toxicity*; D003621:Daphnia / Q000187:drug effects* / Q000502:physiology; D004784:Environmental Monitoring / Q000379:methods*; D005260:Female; D007306:Insecticides / Q000633:toxicity*; D007928:Lethal Dose 50; D009043:Motor Activity / Q000187:drug effects; D009862:Online Systems; D009943:Organophosphorus Compounds / Q000633:toxicity*; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D002800:Cholinesterase Inhibitors; D007306:Insecticides; D009943:Organophosphorus Compounds; D014874:Water Pollutants, Chemical