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conferenceseries.com
October 24-25, 2016 | Valencia, Spain
International Conference on
Environmental Health & Safety
Volume 4, Issue 5 (Suppl) Occup Med Health
ISSN:2329-6879 OMHA, an open access journal Environmental Health 2016
October 24-25, 2016
TOXICOLOGICALAND BIOCHEMICALMIXTURE EFFECTS OFAN HERBICIDEANDAMETAL
ON MARINE PRIMARY PRODUCERS AND PRIMARY CONSUMERS
Filimonova V.a,b,c , De Schamphelaere Kc , Nys C.c , Gonçalves F.b, Marques J.C. a, Gonçalves A.M.M.a,b and De Troch M.c
aUniversity of Coimbra, Portugal
bUniversity of Aveiro, Portugal
cGhent University, Belgium
Mixture effects of chemicals and their potential synergistic interactions are of great concern to both the public and regulatory
authorities worldwide. Intensive agriculture activities are leading to discharges of chemicals mixtures (pesticides and metals)
to the located nearby aquatic areas with severe repercussions to aquatic communities and thus, to the trophic food web. Further
information about the impacts of these stressors in aquatic organisms is needed. By this, our study address toxic and biochemical
effects of single and equitoxic mixtures of the herbicide Primextra® Gold TZ and the metal copper in the marine diatomThalassiosira
weissflogii and in the estuarine calanoidAcartia tonsa by determining growth rate and immobilisation effects, respectively, and changes
on fatty acids (FA) profiles, being the latter a good biomarker of stress. Single effects revealed that the herbicide is considerably more
toxic to diatoms than to copepods, whereas the metal showed an opposite trend. Mixture effects revealed that copper and Primextra®
acted antagonistically relative to concentration addition model on diatoms and synergistically relative to independent action model
on copepods. FA profiles of diatom responded significantly to the single copper exposure. Significant decline in the content of
copepod FAs was observed after mixture exposure, including considerable decrease of essential FAs that cannot be synthesized de
novo. Our results revealed that the mixture effects are more hazardous for primary consumer than for primary producer species in
terms of abundance and biomass quality, suggesting the harmful effects for higher trophic levels, biodiversity losses and decrease in
ecosystem health status.
Biography
Valentina Filimonova is currently a 29 years old PhD researcher at the final year of the Doctoral Programme on Marine Ecosystem Health and Conservation
(MARES, ) from University of Aveiro, Portugal, and Ghent University, Belgium. She published 2 papers in indexed SCI journals.
Filimonova V, Occup Med Health Aff 2016, 4:5 (Suppl)