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Mixtures of Cu, Ni, and Zn act mostly noninteractively on Pseudokirchneriella subcapitata growth in natural waters.
Environ Toxicol Chem. 2018 02; 37(2):587-598.ET

Abstract

Freshwater biota are usually exposed to mixtures of different metals in the environment, which raises concern because risk-assessment procedures for metals are still mainly based on single-metal toxicity. Because microalgae are primary producers and therefore at the base of the food web, it is of utmost importance to understand the effects of metal mixtures on these organisms. Most studies that have investigated the combined interactive effects of mixtures on microalgae performed tests in only one specific water. The objective of the present study was to test if combined effects of mixtures to Pseudokirchneriella subcapitata were the same or different across natural waters showing diverse water-chemistry characteristics. This was done by performing experiments with ternary Cu-Ni-Zn mixtures in 3 natural waters and with binary Cu-Ni mixtures in 5 natural waters. We showed that the ternary mixture acted noninteractively on algal growth, except in one water in which the mixture acted antagonistically. We suggest that a low-cationic competition situation in the latter water could be the reason for the antagonistic interaction between the metals. On the other hand, the binary mixture acted noninteractively on algal growth in all tested waters. We showed that both the concentration addition and independent action models can serve as accurate models for toxicity of ternary Cu-Ni-Zn and binary Cu-Ni mixtures to P. subcapitata in most cases and as protective models in all cases. In addition, we developed a metal mixture bioavailability model, by combining the independent action model and the single-metal bioavailability models, that can be used to predict Cu-Ni-Zn and Cu-Ni toxicity to P. subcapitata as a function of metal concentration and water characteristics. Environ Toxicol Chem 2018;37:587-598. © 2017 SETAC.

Authors+Show Affiliations

Faculty of Bioscience Engineering, Laboratory of Environmental Toxicology and Aquatic Ecology, Ghent University, Ghent, Belgium.Faculty of Bioscience Engineering, Laboratory of Environmental Toxicology and Aquatic Ecology, Ghent University, Ghent, Belgium.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28986992

Citation

Van Regenmortel, Tina, and Karel A C. De Schamphelaere. "Mixtures of Cu, Ni, and Zn Act Mostly Noninteractively On Pseudokirchneriella Subcapitata Growth in Natural Waters." Environmental Toxicology and Chemistry, vol. 37, no. 2, 2018, pp. 587-598.
Van Regenmortel T, De Schamphelaere KAC. Mixtures of Cu, Ni, and Zn act mostly noninteractively on Pseudokirchneriella subcapitata growth in natural waters. Environ Toxicol Chem. 2018;37(2):587-598.
Van Regenmortel, T., & De Schamphelaere, K. A. C. (2018). Mixtures of Cu, Ni, and Zn act mostly noninteractively on Pseudokirchneriella subcapitata growth in natural waters. Environmental Toxicology and Chemistry, 37(2), 587-598. https://doi.org/10.1002/etc.3999
Van Regenmortel T, De Schamphelaere KAC. Mixtures of Cu, Ni, and Zn Act Mostly Noninteractively On Pseudokirchneriella Subcapitata Growth in Natural Waters. Environ Toxicol Chem. 2018;37(2):587-598. PubMed PMID: 28986992.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mixtures of Cu, Ni, and Zn act mostly noninteractively on Pseudokirchneriella subcapitata growth in natural waters. AU - Van Regenmortel,Tina, AU - De Schamphelaere,Karel A C, Y1 - 2017/12/11/ PY - 2017/06/12/received PY - 2017/07/29/revised PY - 2017/10/05/accepted PY - 2017/10/8/pubmed PY - 2018/11/18/medline PY - 2017/10/8/entrez KW - Algae KW - Concentration addition KW - Freshwater KW - Independent action KW - Metal KW - Mixture toxicity KW - Risk assessment SP - 587 EP - 598 JF - Environmental toxicology and chemistry JO - Environ Toxicol Chem VL - 37 IS - 2 N2 - Freshwater biota are usually exposed to mixtures of different metals in the environment, which raises concern because risk-assessment procedures for metals are still mainly based on single-metal toxicity. Because microalgae are primary producers and therefore at the base of the food web, it is of utmost importance to understand the effects of metal mixtures on these organisms. Most studies that have investigated the combined interactive effects of mixtures on microalgae performed tests in only one specific water. The objective of the present study was to test if combined effects of mixtures to Pseudokirchneriella subcapitata were the same or different across natural waters showing diverse water-chemistry characteristics. This was done by performing experiments with ternary Cu-Ni-Zn mixtures in 3 natural waters and with binary Cu-Ni mixtures in 5 natural waters. We showed that the ternary mixture acted noninteractively on algal growth, except in one water in which the mixture acted antagonistically. We suggest that a low-cationic competition situation in the latter water could be the reason for the antagonistic interaction between the metals. On the other hand, the binary mixture acted noninteractively on algal growth in all tested waters. We showed that both the concentration addition and independent action models can serve as accurate models for toxicity of ternary Cu-Ni-Zn and binary Cu-Ni mixtures to P. subcapitata in most cases and as protective models in all cases. In addition, we developed a metal mixture bioavailability model, by combining the independent action model and the single-metal bioavailability models, that can be used to predict Cu-Ni-Zn and Cu-Ni toxicity to P. subcapitata as a function of metal concentration and water characteristics. Environ Toxicol Chem 2018;37:587-598. © 2017 SETAC. SN - 1552-8618 UR - https://www.unboundmedicine.com/medline/citation/28986992/Mixtures_of_Cu_Ni_and_Zn_act_mostly_noninteractively_on_Pseudokirchneriella_subcapitata_growth_in_natural_waters_ DB - PRIME DP - Unbound Medicine ER -