Deltamethrin toxicity to the midge Chironomus riparius Meigen - Effects of exposure scenario and sediment quality

Sammanfattning

We investigated how exposure scenario and sediment characteristics affected deltamethrin bioavailability and toxicity to Chironomus riparius. We designed whole-sediment experiments, including separate spiked-water and spiked-sediment experiments and using both a peat-based artificial and a natural sediment. Deltamethrin was highly toxic to larvae in artificial sediments, with LC50-values (28 d) of 11 mu g/kg for sediment-exposures and 16 pg/L for water-exposures. In contrast, deltamethrin-induced mortality was absent in experiments with natural sediment, both in spiked water and in spiked sediment. This was attributed to the higher organic matter content of the natural sediment, 12.5 +/- 0.05%, compared with that in the artificial sediments, 4.1-4.8%, resulting in an efficient and fast sorption and lower bioavailability. Deltamethrin degradation was absent in artificial sediment, while in natural sediment, 50% degraded during 10 days of test-vessel acclimation. Despite a faster degradation, the highest measured concentration in spiked-natural sediment was more than seven times higher than the LC50-value obtained in tests with spiked-artificial sediment, indicating that low bioavailability, and not compound degradation, was the main reason for the observed lack of deltamethrin toxicity. (C) 2007 Elsevier Inc. All rights reserved.

Nyckelord

Chironomus riparius; sediments; toxicity testing; bioavailability; pyrethroids

Publicerad i

Ecotoxicology and Environmental Safety
2008, Volym: 70, nummer: 1, sidor: 53-60
Utgivare: ACADEMIC PRESS INC ELSEVIER SCIENCE

SLU författare

• Åkerblom, Nina

  • Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
    

• Goedkoop, Willem

  • Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
    

Globala målen

SDG6 Rent vatten och sanitet för alla


UKÄ forskningsämne

Fisk- och akvakulturforskning


Publikationens identifierare

DOI: https://doi.org/10.1016/j.ecoenv.2007.09.001

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/18809