Phototaxis index of daphnia carinata as an indicator of joint toxicity of copper, cadmium, zinc, nitrogen and phosphorus in aqueous solutions

Wu, Yonggui and Lin, Chuxia and Yuan, Ling (2008) Phototaxis index of daphnia carinata as an indicator of joint toxicity of copper, cadmium, zinc, nitrogen and phosphorus in aqueous solutions. Ecological Indicators, 8 (1). pp. 69-74. ISSN 1470-160X


An orthogonal design method was used for examining the responses of Daphnia carinata to 16 combination mixtures of copper, cadmium, zinc, nitrogen and phosphorus in synthetic solutions. Phototaxis index (Ip), mobilization inhibition percentage (MIP) and mortality percentage (MP) were used as test endpoints for toxicity assessment. The results show that Cu and Cd were the dominant toxicants that affected the D. carinata in the test solutions. However, the contribution of nitrogen, relative to other components, to the overall toxicity to D. carinata could increase over time. It was found that three toxicity parameters (i.e. Ip, MIP and MP) used in this study were significantly interrelated (at p < 0.003 level). Cluster analysis also indicates that there was a general agreement between the toxicity indicated by Ip and the universally accepted test endpoints (MIP or MP); MIP and MP represent the universally accepted test endpoints, i.e. mobilization inhibition and mortality. These results suggest that the phototaxis index of D. carinata is an appropriate test endpoint for toxicity testing of environmental samples. This has implications for developing rapid, non-destructive bioassays for ecotoxicological assessment of aquatic environments.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Depositing User: epEditor USQ
Faculty / Department / School: Current - USQ Other
Date Deposited: 13 Jun 2011 01:16
Last Modified: 16 Oct 2014 03:03
Uncontrolled Keywords: daphnia; heavy metals; joint toxicity; nitrogen; bioassay; phosphorus; phototaxis index; aqueous solution; cadmium; copper; crustacean; ecotoxicology; mortality; nitrogen; pollution effect; zinc
Fields of Research : 06 Biological Sciences > 0602 Ecology > 060204 Freshwater Ecology
10 Technology > 1002 Environmental Biotechnology > 100204 Environmental Biotechnology Diagnostics (incl. Biosensors)
06 Biological Sciences > 0605 Microbiology > 060504 Microbial Ecology
Socio-Economic Objective: D Environment > 96 Environment > 9611 Physical and Chemical Conditions of Water > 961103 Physical and Chemical Conditions of Water in Fresh, Ground and Surface Water Environments (excl. Urban and Industrial Use)
Identification Number or DOI: doi: 10.1016/j.ecolind.2007.01.006

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