Approved Abstracts

Comparative bioaccumulation of organochlorinated and current-use pesticides in cockle (Cerastoderma glaucum), sea snail (Murex trunculus) and golden grey mullet (Liza aurata) from the Mar Menor lagoon (SE Spain)



Author(s): García-Pimentel, M.; León V.; Pardo D; Campillo J.A.;
Presenter: Maria del Mar García Pimentel

The bioaccumulation of organochlorinated contaminants in marine organisms has been extensively evidenced all over the world as consequence of their wide distribution and persistence of in the environment. Furthermore, a significant increase of their concentration has been also confirmed along the trophic chain (biomagnification). However, less information is available in relation to the bioaccumulation and biomagnifications of current-use pesticides (CUPs) in coastal areas. This study has compared the bioaccumulation and transfer of organochlorinated and CUPs at different trophic levels. Specifically, the concentrations of CUPs (pendimethalin, trichloronate, dimethyl tetrachloroterephthalate-DCPA, tokuthion, prothiophos, fenchlorphos and chlorpyrifos), polychlorinated biphenyls (PCBs) and organochlorinated pesticides (OCPs) in cockle (Cerastoderma glaucum), sea snail (Murex trunculus) and golden grey mullet (Liza aurata) from Mar Menor lagoon (SE Spain) were characterized. Sea snail is a natural predator of cockle in the Mar Menor lagoon and consequently the biomagnification of all these contaminants was also assessed in three areas from this lagoon in summer of 2018 and winter of 2019. In order to identify correctly the trophic level of all biota samples, stable isotopes of C and N were also determined. Surface sediment (first cm) and biota were simultaneously sampled in each area. Both the sediment samples and biota were lyophilized, ground and stored at -20ºC until analysis. The extraction of the compounds was carried out following the Soxhlet and purification method proposed by Fernández et al., (2010) and the extracts were analyzed by GC-MS/MS. The occurrence of OCPs and CUPs was evidenced in sediment and biota samples, confirming the influence of agriculture as the main source for these contaminants in the study area. In general, the concentrations of OCPs were higher than those found for CUPs in the same matrices. Pendimethalin and chlorpyrifos were the predominant CUPs found in sediments and biota samples. The increase of pesticides concentrations in sediment after flash flood event (autumn 2019) was also confirmed for OCPs and CUPs.
References
Fernández, B., Campillo, J.A., Martínez-Gómez, C., Benedicto, J. 2010. Aquat Toxicol 9, 186–197.
Acknowledgement
This work has been supported by the Spanish Inter-Ministerial Science and Technology Commission and by the European Union (European Regional Development Fund, ERDF) through PLAS-MED project (CTM2017-89701-C3-3-R). M. García Pimentel acknowledges the Spanish Ministerial Science, Innovation and University for her predoctoral fellowship (PRE2018-085502).


Keywords: Bioaccumulation and biomagnification; organochlorinated and current use pesticides; sediment and biota marine

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