The effects of zinc on the structure and functioning of a freshwater community: A microcosm experiment

Dimitri Van de Perre*, Ivo Roessink, Colin R. Janssen, Erik Smolders, Tina van Regenmortel, Jeroen Van Wichelen, Wim Vyverman, Paul J. van den Brink, Karel A.C. De Schamphelaere

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

A major problem with risk assessment of chemicals is the extrapolation of laboratory single-species toxicity tests, which oversimplify the actual field situation by ignoring species interactions, to natural communities. The authors tested if the bioavailability-normalized 5% hazardous concentration (HC5) estimated from chronic planktonic single-species toxicity data (HC5plankton) for zinc (Zn) is protective for a plankton community and investigated the direct and indirect effects of Zn (at HC5 and HC50) on a freshwater community's structure and function. Microcosms were exposed to 3 different Zn concentrations (background, HC5plankton=75μgZn/L and HC50plankton=300μgZn/L) for 5wk. The planktonic groups revealed a consistent no-observed-effect concentration for the community of 75μgZn/L, similar to or higher than the HC5plankton, thus suggesting its protectiveness in the present study. At 300μgZn/L a significant reduction in cladocerans resulted in increases of rotifer, ciliate, and phytoplankton abundance. In addition, the phytoplankton community shifted in dominance from grazing-resistant to edible species. Contrary to the species sensitivity distribution (SSD) prediction, which identified phytoplankton as the most sensitive group, only the total chlorophyll and the abundance of 2 phytoplankton species were adversely affected at 300μgZn/L. Thus, although the HC5 estimated from the bioavailability-normalized SSD was overall protective for the plankton community, the SSD was not able to correctly predict the species sensitivity ranking within their community context at the HC50.

Original languageEnglish
Pages (from-to)2698-2712
JournalEnvironmental Toxicology and Chemistry
Volume35
Issue number11
DOIs
Publication statusPublished - 2016

Keywords

  • Biotic ligand model
  • Community-level effect
  • Microcosm
  • Plankton
  • Zinc

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