February 1st to 5th 2016
Olhão, Portugal
Tweet #MaresConference2016

Fatty acids as indicator of the effect of an herbicide in two marine bivalve species: Cerastoderma edule and Scrobicularia plana

Scientific Exhibition
Biodiversity Effects
Thursday, February 4, 2016 -
17:30 to 19:30

Mesquita, A.F. 1 Verdelhos, T. 2 Coutinho, J.A.P. 3 Marques, J.C. 4 Gonçalves, F. 5 Gonçalves, A.M.M. 6

1Department of Biology and CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
2IMAR & MARE, Department of Life Sciences, University of Coimbra, 3004-517 Coimbra, Portugal
3CICECO, Department of Chemistry, University of Aveiro, 3810-­193 Aveiro, Portugal
4IMAR & MARE, Department of Life Sciences, University of Coimbra, 3004-517 Coimbra, Portugal
5Department of Biology and CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
61. IMAR &MARE,Dep. of Life Sciences,Coimbra Univ.,3004-517 Coimbra, Portugal 2. Biology Dep. & CESAM,Aveiro Univ.,3810-193 Aveiro, Portugal

In Europe, mainly in the Mediterranean region, an intensive usage of fertilizers and pesticides was recorded at the past 30 years reporting, in some cases to an exceed of contamination up to EU limits. The intensive usage of pollutants in fields near ecological coastal wetlands, led to the implementation of the Pesticide-Monitoring programs to recover aquatic systems, such as in the Mondego estuary (Figueira da Foz, Portugal). According to the information from agricultural cooperatives of the Mondego valley, Primextra® Gold TZ is the most used herbicide in corn crops fields. Biomarkers, such fatty acids (FA), proved to be a new and potential powerful tool to detect, document and evaluate exposure to and the effects of contamination hazards. FA play an important role on neural levels of biochemical and physiological response of the organisms, be considered a good bioindicator of ecosystem health and bioindicator of stress. Bivalves are currently used in ecotoxicological bioassays due to their ecological importance, their wide geographic distribution, ease of handling in the laboratory and in the field, and their ability to filter and ingest large volumes of water and sediment particles. Thus, the main goal of this work are to determine toxic and biochemical (namely fatty acids profiles) responses of two size classes (Small=S and Big=B) of two marine bivalve species - Cerastoderma edule and Scrobicularia plana, to the herbicide Primextra® Gold. Furthermore, this work also aims to compare the fatty acid (FA) contents and thus, the nutritive value of both species and size classes, collected in the field with those under laboratory conditions. Results show S. plana is more sensitive to the herbicide than C. edule. In general, on the field, S. plana (B) is more nutritive than C. edule (B), whereas the smallest organisms present an opposite tendency, with C. edule presenting higher abundance of FA.
keywords: 
Herbicide, Marine bivalves, Fatty acids, Food quality

Log in to upload your presentation