Abstract
Mixture effects of chemicals and their potential synergistic interactions are of great concern to the public and regulatory authorities worldwide. Intensive agricultural activities are leading to discharges of chemical mixtures to nearby estuarine and marine waters with possible adverse effects on the aquatic communities and for the trophic food web interlinking these communities. Further information about the impacts of these stressors on aquatic organisms is needed. This study addresses ecotoxicological and biochemical effects of single and mixtures of the metal copper and the herbicide Primextra® Gold TZ on the marine diatom Thalassiosira weissflogii and on the estuarine calanoid copepod Acartia tonsa by determining growth rate and survival, respectively, and changes on fatty acid(FA) profiles in both species. Mixture effects on diatom species revealed that copper and Primextra® acted most likely additively with respect to the concentration addition (CA) and independent action (IA) models with model deviation ratios (MDR), 0.752 and 1.063, respectively. For the copepod species, copper and Primextra® were most likely non-interactive with respect to the CA model (MDR = 1.521) but acted most likely synergistically with respect to the IA model (MDR = 2.026). A significant decline in the absolute FA concentration was observed for copepod species after mixture exposure including a considerable decrease of essential FAs that cannot be synthesized de novo by these grazers. We concluded that the mixture effects are more hazardous for primary consumer than for primary producer species in terms of both abundance and biomass quality, suggesting a potential for harmful effects for higher trophic levels and thus a decrease in energy flow through the ecosystem.
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Acknowledgements
We thank A. C. Garcia and P. Barría for the significant assistance during sampling campaigns, N. De Saeyer for performing the atomic absorption spectrophotometric and gas-liquid chromatography-mass spectrometric analyses, and D. Van Gansbeke for his assistance with the FA analyses.
Funding
This work was funded through a MARES Grant. MARES is a Joint Doctoral program selected under Erasmus Mundus coordinated by Ghent University (FPA 2011-0016) (www.mares-eu.org). This study had also the support of Portuguese Foundation for Science and Technology (FCT, Portugal), through the strategic project UID/MAR/04292/2013, granted to MARE, and UID/AMB//50017/2013, granted to CESAM. A. M. M. Gonçalves also thanks FCT for financial support through the post-doctoral grant SFRH/BPD/97210/2013, co-funded by the Human Potential Operational Programme (National Strategic Reference Framework 2007-2013), European Social Fund (EU), and the program POPH/FSE. The FA analyses were supported by FWO-Flanders and the Special Research Fund—Ghent University in the form of research grant 31523814 “Fatty acids as dietary tracers in benthic food webs” and research project 01N2816 “Energy transfer at the basis of marine food webs in a changing world” awarded to M. De Troch.
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Filimonova, V., Nys, C., De Schamphelaere, K.A.C. et al. Ecotoxicological and biochemical mixture effects of an herbicide and a metal at the marine primary producer diatom Thalassiosira weissflogii and the primary consumer copepod Acartia tonsa. Environ Sci Pollut Res 25, 22180–22195 (2018). https://doi.org/10.1007/s11356-018-2302-x
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DOI: https://doi.org/10.1007/s11356-018-2302-x