Document Detail

Development of a new biomonitoring method to detect the abnormal activity of Daphnia magna using automated Grid Counter device.
MedLine Citation:
PMID:  17961634     Owner:  NLM     Status:  MEDLINE    
The aim of the present study was to develop a biological early warning system (BEWS), equipped with six monitoring channels to individually observe the activity of Daphnia magna, using a digital 'Grid Counter', which would trigger an alarm within an appropriate time, and examine the functional performance of the newly developed BEWS for detecting unusual water quality. In order to detect the changes in the activity of D. magna, six relative activity parameter values (Z(a)) were computed from the 6 individual monitoring channels; with the activity data for D. magna calculated every 5 min. The Student's t-test was used to verify the difference between the mean value of the system in a steady state, as a control, and the exposure values during a sudden pollution event. The test results illustrate that the threshold value for the alarm can be at p=0.0093 for 3 consecutive detections. The time period, defined as the average time taken from the detection of hyper to retarded activity of the organism, for Cu concentrations of 50, 100, 200 and 400 ppb were 7.17+/-1.75, 3.94+/-2.02, 1.85+/-0.49 and 1.00+/-0.18 h, respectively. Based on the results of this study, it is proposed that p values from the t-test, with Z(a), are more accurate, stable and predictable parameters for the detection of chemical exposures than the other values, such as the swimming speed and trajectory, etc. Consequently, it would be possible to reduce the number of false alarms and achieve confidence for a system, with the ability of highly accurate detection, such as with the six-channel monitoring system developed in this study.
Junho Jeon; Joon Ha Kim; Byung Cheun Lee; Sang Don Kim
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Publication Detail:
Type:  Journal Article     Date:  2007-10-24
Journal Detail:
Title:  The Science of the total environment     Volume:  389     ISSN:  0048-9697     ISO Abbreviation:  Sci. Total Environ.     Publication Date:  2008 Jan 
Date Detail:
Created Date:  2007-11-20     Completed Date:  2008-02-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0330500     Medline TA:  Sci Total Environ     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  545-56     Citation Subset:  IM    
Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, Republic of Korea.
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MeSH Terms
Daphnia / drug effects*
Environmental Monitoring* / instrumentation,  methods
Equipment Design
Image Processing, Computer-Assisted* / instrumentation,  methods
Motor Activity / drug effects*
Water Pollutants, Chemical / analysis*,  toxicity
Water Pollution / analysis*
Reg. No./Substance:
0/Water Pollutants, Chemical

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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