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Physiological endpoints in daphnid acute toxicity tests.

¹Department of Hydrobiology and Protection of Ecosystems, University of Life Sciences in Lublin, Dobrzańskiego 37, 20-262 Lublin, Poland.

The Science of the Total Environment

|November 6, 2019

Summary

Physiological endpoints in Daphnia offer sensitive, low-cost toxicity testing alternatives. This review evaluates their use in ecotoxicology and drug testing for improved water quality and safety assessments.

Keywords:

Daphnia Feeding activity Heart rate Oxygen consumption Physiological endpoints Toxicity testing

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Area of Science:

Ecotoxicology
Environmental Science
Biomonitoring

Background:

Daphnids are standard freshwater crustaceans for toxicity testing.
Current endpoints like lethality and immobilization lack sensitivity for sublethal effects.
Physiological parameters offer a low-cost, ethical alternative aligning with the 3Rs (Replacement, Reduction, Refinement).

Purpose of the Study:

To review and evaluate commonly measured physiological endpoints in Daphnia.
To assess the applicability of these endpoints in ecotoxicological studies and human drug testing.
To discuss their potential as sensitive indicators for water quality and drug safety.

Main Methods:

Literature review of studies measuring Daphnia physiological parameters.
Analysis of parameters including feeding activity, heart rate, and limb movements.
Evaluation of applicability in ecotoxicology and human drug testing contexts.

Main Results:

Commonly measured physiological parameters include feeding activity, heart rate, and thoracic limb movement.
These parameters demonstrate sensitivity to toxicants and drug compounds.
Existing literature provides a basis for their use in toxicity assessment.

Conclusions:

Physiological endpoints in Daphnia are promising for sensitive, cost-effective toxicity testing.
Further research can establish these endpoints for robust water quality and drug safety assessments.
This approach supports ethical guidelines in animal testing through the 3Rs.