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- Title
The toxicity of the three antifouling biocides DCOIT, TPBP and medetomidine to the marine pelagic copepod Acartia tonsa.
- Authors
Wendt, Ida; Backhaus, Thomas; Blanck, Hans; Arrhenius, Åsa
- Abstract
Copepods, the largest group of pelagic grazers, are at risk from exposure to antifouling biocides. This study investigated the toxicity of the antifouling biocides 4,5-dichloro-2-octyl-1,2-thiazol-3(2H)-one (DCOIT), triphenylborane pyridine (TPBP) and 4-[1-(2,3-dimethylphenyl)ethyl]-1H-imidazole (medetomidine) to the copepod Acartia tonsa, using mortality and egg production as endpoints. The toxicity ranking for mortality was as follows: DCOIT (LC 57 nmol l) = TPBP (LC 56 nmol l) > medetomidine (LC 241 nmol l). Egg production was more sensitive than mortality to TPBP (EC 3.2 nmol l), while DCOIT and medetomidine inhibited egg production at roughly the same concentrations (72 and 186 nmol l respectively). Furthermore, TPBP seems to affect egg hatching directly which was not the case for DCOIT and medetomidine. DCOIT and medetomidine might pose an environmental risk as they have been reported to occur in different exposure scenarios or analytical surveys at concentrations only 2-3 times lower than the respective EC. Reported environmental concentrations of TPBP are few but clearly lower than the EC values reported here, suggesting current risk of TPBP to copepods to be moderate.
- Subjects
BIOCIDES; THIAZOLINES; MEDETOMIDINE; COPEPODA; ACARTIA tonsa
- Publication
Ecotoxicology, 2016, Vol 25, Issue 5, p871
- ISSN
0963-9292
- Publication type
Article
- DOI
10.1007/s10646-016-1644-8