Should oral exposure in Hypoaspis aculeifer tests be considered in order to keep them in Tier I test battery for ecological risk assessment of PPPs?. (January 2019)

• Record Type: Journal Article
• Authors: Natal-da-Luz, Tiago; Gevaert, Tom; Pereira, Carla; Alves, Daniela; Arena, Maria; Sousa, José Paulo
• Is Part Of: Environmental pollution. Volume 244(2019)
• Page Start: 871
• Page End: 876
• Publication Date: 2019-01
• Subjects: Predatory mite -- Route of exposure -- Food ingestion -- Contaminated prey -- Toxicity; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2018.10.113
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: The laboratory reproduction test with the predatory mite Hypoaspis aculeifer is currently a mandatory test in the new EU data requirements for prospective environmental risk assessment of Plant Protection Products (PPPs). However, the low sensitivity often shown by this mite towards PPPs, when compared to other invertebrates (namely Folsomia candida and Eisenia fetida ), makes the test with this species not very useful in the lower tier test battery. However, the current test protocol only considers exposure to contaminants via contaminated soil, disregarding exposure via contaminated food and does not take into account the fact that H. aculeifer is a predatory species. Therefore, through this protocol, the toxicity of contaminants to soil mites might be underestimated and, thus, an adaptation of the test performance, by including exposure via contaminated food, may be necessary. With this aim, two reproduction tests with H. aculeifer were performed using copper chloride as model substance, artificial soil as test substrate and cheese mites as food. The OECD guideline was followed but, while in one test cheese mites from normal laboratory breeding cultures (clean prey mites) were provided, in the other test, cheese mites previously exposed to copper (Cu pre-exposed prey mites) were provided. Predatory mites were affected at lower concentrations in tests using Cu pre-exposed prey compared to test with clean-prey (NOEC = 1225 and 1508 mg kg −1 and EC10 = 1204 and 1903 mg kg −1 using Cu pre-exposed and clean prey, respectively). However, this higher sensitivity was not detected by EC50 values (EC50 = 2634 and 2814 mg kg −1 using Cu pre-exposed and clean prey, respectively). Further tests are needed in order to (i) investigate the relevance of oral exposure to different PPPs, (ii) optimize the contamination of prey mites according to the chemical properties of each substance and (iii) substantiate a proposal to adapt the standard protocol. Graphical abstract: Image 1 Highlights: Reproduction test with H. aculeifer has often low sensitivity to soil contaminants. Current test protocol disregard exposure via contaminated food. Predatory mites feed through contaminated preys were more sensitive towards Cu. However, this higher sensitivity was detected only by EC10 values. Further tests should investigate the relevance of oral exposure to different PPPs. Abstract : Predatory mites were affected at lower concentrations in tests using Cu pre-exposed prey mites compared to test with clean prey, which highlights the need of including exposure via food in tests with H. aculeifer .