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The Effects of Nickel on the Structure and Functioning of a Freshwater Plankton Community Under High Dissolved Organic Carbon Conditions: A Microcosm Experiment.
Environ Toxicol Chem. 2019 09; 38(9):1923-1939.ET

Abstract

In the present study, we aimed to test the protectiveness of the bioavailability-normalization procedure, with its associated hazardous concentrations for x% of the species (HCx), that is currently implemented to derive environmental threshold concentrations for nickel (Ni) in European environmental legislative frameworks. We exposed a natural plankton-dominated community to 3 constant Ni concentrations, that is, a control with no Ni added (background Ni of 1.2-4 µg/L) and the bioavailability-normalized HC5 and HC50 of 24 and 97 µg dissolved Ni/L, respectively, during a 56-d microcosm experiment under high dissolved organic carbon (DOC) conditions (DOC of 14 mg/L at test initiation). The effects of the bioavailability-normalized HC5 and HC50 values were evaluated at the levels of community structure (community composition and plankton group abundances), community functioning (measured as indirect physicochemical proxies for overnight respiration and carbon fluxes), and individual species abundances. The bioavailability-normalized HC50 treatment had clear effects (defined as effects occurring on at least 2 consecutive sampling days) on both the structure and functioning of the investigated aquatic community. Through its effect on community functioning (i.e., reduced pH and DOC), Ni also influenced its own bioavailability. Clear direct effects of Ni were observed for only 3 species (the Cyanobacteria Oscillatoria sp. 1 and the rotifers Asplanchna/Testidunela sp. and Trichocerca group similis). Most other effects occurring in the plankton community in the HC50 treatment were indirect and likely driven by the direct effect of Ni on the Cyanobacteria Oscillatoria sp. 1, which was the dominant phytoplankton species in the control microcosms. In contrast, the bioavailability-normalized HC5 did not induce clear effects on community structure and functioning endpoints: these were only affected on individual sampling days. Clear (direct) effects were observed for only 2 plankton species (the rotifer Trichocerca group similis and the Cyanobacteria Oscillatoria sp. 1), but their abundances recovered to control levels at the end of the study. In addition, a few species (1 phytoplankton and 3 zooplankton species) were affected in the HC5 treatment only on the last sampling day. It is uncertain whether these species would have shown clear effects over a longer exposure duration. Thus, our study shows that the bioavailability-normalized HC5 of Ni at high DOC induced clear effects on a few individual species. However, the overall conclusion is that the bioavailability-normalized HC5 of Ni as derived through the procedure that is currently implemented in European legislative frameworks protects against clear effects on community structure and function. Environ Toxicol Chem 2019;38:1923-1939. © 2019 SETAC.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Nys C
GhenToxLab, Department of Animal Science and Aquatic Ecology, Ghent University, Ghent, Belgium. ARCHE Consulting, Ghent (Wondelgem), Belgium.
Van Regenmortel T
GhenToxLab, Department of Animal Science and Aquatic Ecology, Ghent University, Ghent, Belgium.
De Schamphelaere K
GhenToxLab, Department of Animal Science and Aquatic Ecology, Ghent University, Ghent, Belgium.

MeSH

AnimalsBiological AvailabilityFresh WaterHumic SubstancesModels, TheoreticalNickelNo-Observed-Adverse-Effect LevelPhytoplanktonWater Pollutants, ChemicalZooplankton

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

31120596

Citation

Nys, Charlotte, et al. "The Effects of Nickel On the Structure and Functioning of a Freshwater Plankton Community Under High Dissolved Organic Carbon Conditions: a Microcosm Experiment." Environmental Toxicology and Chemistry, vol. 38, no. 9, 2019, pp. 1923-1939.
Nys C, Van Regenmortel T, De Schamphelaere K. The Effects of Nickel on the Structure and Functioning of a Freshwater Plankton Community Under High Dissolved Organic Carbon Conditions: A Microcosm Experiment. Environ Toxicol Chem. 2019;38(9):1923-1939.
Nys, C., Van Regenmortel, T., & De Schamphelaere, K. (2019). The Effects of Nickel on the Structure and Functioning of a Freshwater Plankton Community Under High Dissolved Organic Carbon Conditions: A Microcosm Experiment. Environmental Toxicology and Chemistry, 38(9), 1923-1939. https://doi.org/10.1002/etc.4504
Nys C, Van Regenmortel T, De Schamphelaere K. The Effects of Nickel On the Structure and Functioning of a Freshwater Plankton Community Under High Dissolved Organic Carbon Conditions: a Microcosm Experiment. Environ Toxicol Chem. 2019;38(9):1923-1939. PubMed PMID: 31120596.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The Effects of Nickel on the Structure and Functioning of a Freshwater Plankton Community Under High Dissolved Organic Carbon Conditions: A Microcosm Experiment. AU - Nys,Charlotte, AU - Van Regenmortel,Tina, AU - De Schamphelaere,Karel, Y1 - 2019/07/26/ PY - 2018/10/22/received PY - 2018/11/26/revised PY - 2019/05/17/accepted PY - 2019/5/24/pubmed PY - 2020/4/18/medline PY - 2019/5/24/entrez KW - Bioavailability KW - Biotic ligand model KW - Community KW - Ecological risk assessment KW - Freshwater toxicology KW - Metal KW - Metal toxicity KW - Microcosm KW - Phytoplankton KW - Plankton community KW - Risk assessment KW - Zooplankton SP - 1923 EP - 1939 JF - Environmental toxicology and chemistry JO - Environ Toxicol Chem VL - 38 IS - 9 N2 - In the present study, we aimed to test the protectiveness of the bioavailability-normalization procedure, with its associated hazardous concentrations for x% of the species (HCx), that is currently implemented to derive environmental threshold concentrations for nickel (Ni) in European environmental legislative frameworks. We exposed a natural plankton-dominated community to 3 constant Ni concentrations, that is, a control with no Ni added (background Ni of 1.2-4 µg/L) and the bioavailability-normalized HC5 and HC50 of 24 and 97 µg dissolved Ni/L, respectively, during a 56-d microcosm experiment under high dissolved organic carbon (DOC) conditions (DOC of 14 mg/L at test initiation). The effects of the bioavailability-normalized HC5 and HC50 values were evaluated at the levels of community structure (community composition and plankton group abundances), community functioning (measured as indirect physicochemical proxies for overnight respiration and carbon fluxes), and individual species abundances. The bioavailability-normalized HC50 treatment had clear effects (defined as effects occurring on at least 2 consecutive sampling days) on both the structure and functioning of the investigated aquatic community. Through its effect on community functioning (i.e., reduced pH and DOC), Ni also influenced its own bioavailability. Clear direct effects of Ni were observed for only 3 species (the Cyanobacteria Oscillatoria sp. 1 and the rotifers Asplanchna/Testidunela sp. and Trichocerca group similis). Most other effects occurring in the plankton community in the HC50 treatment were indirect and likely driven by the direct effect of Ni on the Cyanobacteria Oscillatoria sp. 1, which was the dominant phytoplankton species in the control microcosms. In contrast, the bioavailability-normalized HC5 did not induce clear effects on community structure and functioning endpoints: these were only affected on individual sampling days. Clear (direct) effects were observed for only 2 plankton species (the rotifer Trichocerca group similis and the Cyanobacteria Oscillatoria sp. 1), but their abundances recovered to control levels at the end of the study. In addition, a few species (1 phytoplankton and 3 zooplankton species) were affected in the HC5 treatment only on the last sampling day. It is uncertain whether these species would have shown clear effects over a longer exposure duration. Thus, our study shows that the bioavailability-normalized HC5 of Ni at high DOC induced clear effects on a few individual species. However, the overall conclusion is that the bioavailability-normalized HC5 of Ni as derived through the procedure that is currently implemented in European legislative frameworks protects against clear effects on community structure and function. Environ Toxicol Chem 2019;38:1923-1939. © 2019 SETAC. SN - 1552-8618 UR - https://www.unboundmedicine.com/medline/citation/31120596/The_Effects_of_Nickel_on_the_Structure_and_Functioning_of_a_Freshwater_Plankton_Community_Under_High_Dissolved_Organic_Carbon_Conditions:_A_Microcosm_Experiment_ DB - PRIME DP - Unbound Medicine ER -