Evaluations of combined zebrafish (Danio rerio) embryo and marine phytoplankton (Diacronema lutheri) toxicity of dissolved organic contaminants in the Ythan catchment, Scotland, UK

Emmanuel S. Emelogu (Lead / Corresponding author), Thomas Benjamin Seiler, Pat Pollard, Craig D. Robinson, Lynda Webster, Craig McKenzie, Sebastian Heger, Henner Hollert, Eileen Bresnan, Jennifer Best, Colin F. Moffat

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A wide variety of organic contaminants including pesticides, polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) have previously been detected in surface waters in the river Ythan catchment, North East Scotland UK. While the concentrations detected were below Water Framework Directive Environmental Quality Standards (WFD-EQSs) environmental exposures to the diverse mixtures of contaminants, known and unknown, may pose chronic and/or sublethal effects to non target organisms. The present study assessed the embryo and algal toxicity potential of freely dissolved organic contaminants from the Ythan catchment using silicone rubber passive sampling devices (SR-PSDs) and miniaturised bioassay techniques. Zebrafish (Danio rerio) embryos and marine phytoplankton species (Diacronema lutheri) were exposed to extracts from SR-PSDs deployed at different locations along the river Ythan and an undeployed procedural blank. Statistically significant developmental and algal toxicities were measured in all tests of extracts from deployed samples compared with the procedural blanks. This indicates environmental exposure to, and the combined toxicity potential of, freely dissolved organic contaminants in the catchment. The present and previous studies in the Ythan catchment, coupling SR-PSDs and bioassay techniques, have both helped to understand the interactions and combined effects of dissolved organic contaminants in the catchment. They have further revealed the need for improvement in the techniques currently used to assess environmental impact.

Original languageEnglish
Pages (from-to)5537-5546
Number of pages10
JournalEnvironmental Science and Pollution Research
Volume21
Issue number8
Early online date10 Jan 2014
DOIs
Publication statusPublished - Apr 2014

Keywords

  • Algal growth inhibition
  • Diacronema lutheri
  • Fish embryo toxicity test (FET)
  • Organic contaminants
  • Pesticides
  • Polychlorinated biphenyls (PCBs)
  • Polycyclic aromatic hydrocarbons (PAHs)
  • Silicone rubber passive sampling
  • Water quality monitoring

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