Development of a new low cost high sensitivity system for behavioural ecotoxicity testing

Area of Science:

• Ecotoxicology
• Environmental Science
• Behavioral Ecology

Background:

• The amphipod Gammarus pulex is a standard model organism in ecotoxicological research.
• Current ecotoxicological tests for G. pulex are often labor-intensive and require expensive equipment.
• There is a need for cost-effective and sensitive methods for assessing the impact of pollutants on aquatic invertebrates.

Purpose of the Study:

• To develop and validate a novel, low-cost infrared actograph system for measuring Gammarus pulex activity.
• To assess the system's sensitivity in detecting behavioral effects of heavy metal contamination at low concentrations.
• To establish the system as a viable tool for ecotoxicity testing and water quality monitoring.

Main Methods:

• Construction of a custom, low-cost infrared (IR) actograph system.
• Utilizing the IR system to record the relative activity of Gammarus pulex.
• Exposing G. pulex to varying concentrations of copper (Cu) in controlled laboratory trials.
• Statistical analysis of activity data to compare behavior between control and exposed groups.

Main Results:

• The developed IR actograph system successfully measured relative activity in Gammarus pulex.
• The system detected significant behavioral differences in G. pulex exposed to as little as 10 µg L⁻¹ copper.
• The automated system demonstrated high sensitivity to environmentally relevant concentrations of heavy metals.

Conclusions:

• The developed low-cost IR actograph is a sensitive and effective tool for ecotoxicity assessment.
• This automated system offers a practical alternative to traditional, more resource-intensive testing methods.
• The system holds significant potential for routine ecotoxicity testing and real-time water quality monitoring.