Differences in the behavior characteristics between Daphnia magna and Japanese madaka in an on-line biomonitoring system

Abstract

It is important to select suitable organisms to adapt the requirement of different environment monitoring purposes. Following our previous study, the behavioral responses of Daphnia magna and Japanese madaka (Oryzias latipes) were investigated and compared under flow-through conditions in an on-line biomonitoring system. The results showed that both D. magna and Japanese madaka had similar biological clock, but the circadian rhythms of Japanese madaka was more clearly recorded than that of D. magna. And the sensitivity of D. magna was about two orders of magnitudes higher than that of Japanese madaka in different types of toxic chemicals (dichlorovos, deltamethrin and cadmium chloride). However, when both animals were used in an on-line biomonitoring system, the life span of D. magna was less than 7 days and Japanese madaka could last for more than one month without feeding. Therefore, D. magna was proposed to be a more sensitive bioindicator and was suitable for short term monitoring the pollution events at concentration level closing to the water quality standard, while Japanese madaka was more suitable for the long-term monitoring for accidental discharges.

Evidence for the Stepwise Behavioral Response Model (SBRM): The effects of Carbamate Pesticides on medaka (Oryzias latipes) in an online monitoring system

“…5). These results were accordance with previous studies on Daphnia magna (Ren et al, , 2009aRen and Wang, 2010), which advised that in organophosphorous pesticide exposure, a cascade of regulatory behavioral stress responses were activated and performed by the organisms. Meanwhile, the results in this study proved that either increasing toxicant concentration or exposure time, a cascade of regulatory behavioral stress responses were activated and performed by the organisms.…”

Persistence Parameter: a Reliable Measurement for Behavioral Responses of Medaka (Oryzias latipes) to Environmental Stress

“…Test organisms were placed in a flow-through test chamber (7 cm long, 5 cm in diameter), which was closed off with nylon nets (250 μm) on both sides [38]. One pair of electrodes located at the inside walls of the test chambers and sent a high frequency signal of altering current, which was received by a second pair of noncurrent-carrying electrodes located at the inside walls [47].…”

“…Overall response activity of test organisms inside the chamber is reflected on the signal and is transformed by the A/D converter. Detailed mechanism in OMS can be referred to Ren and Wang [38]. We define the converted data in OMS as behavior strength in the chamber, and the data present the behavioral state responding to environmental stimuli [38].…”

“…Detailed mechanism in OMS can be referred to Ren and Wang [38]. We define the converted data in OMS as behavior strength in the chamber, and the data present the behavioral state responding to environmental stimuli [38]. Behavior strength was automatically sampled by OMS in each second, and average values in every 6 min were produced as output.…”

Posture tracking of multiple individual fish for behavioral monitoring with visual sensors

“…Behavioral monitoring is an efficient and fundamental tool for a long-term study of aquatic ecosystems and water quality assessments, which are more ecologically relevant and economical than chemical sensors (Gerhardt, 1999;Park et al, 2005;Bae and Park, 2014). Fish as a biological indicator have been used widely in biological monitoring systems for environmental studies owing to their sensitivity to changes in the environmental parameters Gerlai et al, 2006;Masud et al, 2005;Ren and Wang, 2010).…”