Recently documented oligotrophication of the Adriatic Sea caused by global changes opened questions how this reflects on the quality and quantity of organic matter (OM) produced by the phytoplankton and on the consequent influence on the micronutrient metals availability and cycling. Within the project, a progressive (model and in-situ) approach will be accomplished to reveal crucial alterations in the marine ecosystem. Initial investigations will imply model experiments on the interaction of selected OM (polysaccharides, lipids, polymeric organic matter containing N catalytic atoms) with micronutrient metals (Fe, Co, Cu, Zn and Cd). Additionally, phytoplankton monoculture incubation under various growth conditions (nutrient concentrations and temperature variations) will be included in order to comprehend multiple impacts on the phytoplankton OM production and micronutrients metals distribution. Model experiments will be followed by in-situ investigations at the selected oligotrophic and eutrophic areas of the Adriatic Sea. This will give holistic informations on the natural marine biochemical cycles and linkage between OM and micronutrient metals. In-situ investigations will be focused on the seasonal variations of the OM and micronutrient appearance and concentrations in combination with physico-chemical parameters (temperature, salinity, pH, O2), and dissolved and particulate organic carbon content, surface-active organic substances and macronutrients (PO4, NO3, NO2, NH4). These investigations will be conducted by intercomparable and multimethodological approaches using various chromatographic to electrochemical techniques. Finally, taking into account all obtained results an important part of the natural marine ecosystem processes will be characterized in the prospective of climate changes.
Simplified schematic of assumed interactions between micronutrient metals (M=Fe, Cu, Co, Zn, Cd) and organic molecules (lipids, acidic polysaccharides and N-POM) released from phytoplankton in conditions of (A) oligotrophy and (B) eutrophy. Biological processes drive production of OM and speciation of micronutrient metals:
(A) Micronutrient metals (hydrated ionic form, M, or inorganic complexes, MX) interact with released OM forming complexes from which cells easily take micronutrient metal by ligand exchange reactions. This is mechanism through which OM enhance bioavailability of micronutrient metals in deficiency.
(B) In eutrophy phytoplankton produce altered organics that form complexes with micronutrient metals which do not enable micronutrient metal uptake by cell. This is mechanism through which OM is reducing toxicity of micronutrient metals when they are in surplus. There are enough micronutrients in inorganic form which are preferable for the cellular uptake.
6.10.2014 - Kickoff meeting
19.09.2016 workshop held at the Ruđer Bošković Institute. The program of the workshop is given in the enclosed brochure.
Mlakar, Marina; Fiket, Željka; Geček, Sunčana; Cukrov, Neven; Cuculić, Vlado.
Marine lake as in situ laboratory for studies of organic matter influence on speciation and distribution of trace metals. // Continental shelf research. 103 (2015) ; 1-11
Gašparović, Blaženka; Kazazić, Snježana P.; Cvitešić, Ana; Penezić, Abra; Frka, Sanja.
Improved separation and analysis of glycolipids by Iatroscan thin–layer chromatography–flame ionization detection. // Journal of chromatography. A. 1409 (2015) ; 259-267
Plavšić, Marta; Strmečki Kos, Sladjana.
Carbohydrate polymers as constituents of exopolymer substances in seawater, their complexing properties towards copper ions, surface and catalytic activity determined by electrochemical methods. // Carbohydrate polymers. (2015)
Mlakar, M., Pavković, S., Tumir, L-M., Vukosav, P., Gašparović, B. 2016. Electrochemical characterization of biochemically active Cu(II) mixed ligand complex with histidine and cysteine. Electroanalysis 28, 1-7.
Vukosav, P., Mlakara, M., Selmani, A., Bregović, N., Gašparović, B. 2016. Electroanalytical characterization of Zn (II) complexes with D-mannosamine and Glycine in aqueous solutions. Electrochim. Acta 188, 671–678.
Orlović-Leko, P.; Vidović, K.; Plavšić, M.; Ciglenečki, I.; Šimunić, I.; Minkina T.: Voltammetry as a tool for rough and rapid characterization of dissolved organic matter in the drainage water of hydroameliorated agricultural areas in Croatia. Journal of Solid State Electrochemistry, 2016, DOI 10.1007/s10008-016-3245-0.
Blaženka Gašparović, Tihana Sesar, Milan Čanković, Zrinka Ljubešić, Enis Hrustić, Zhouyi Zhu, Ruifeng Zhang, Jinzhou Du: How Phytoplankton Membranes Cope With Steep Ionic Strength (Salinity) Gradient? Ocean Sciences Meeting 2016, New Orleans, USA, 21-26 02. 2016.https://agu.confex.com/agu/os16/meetingapp.cgi/Person/238127
Marina Mlakar, Željka Fiket, Vlado Cuculić, Neven Cukrov, Sunčana Geček: Speciation and Distribution of Trace Metals and Organic Matter in Marine Lake as In Situ Laboratory. Ocean Sciences Meeting 2016, New Orleans, USA, 21-26 02. 2016.https://agu.confex.com/agu/os16/meetingapp.cgi/Paper/89673
Tihana Sesar: Phytoplankton cellular lipid response on replete and deplete phosphorous conditions, COST Action ES1408: 1st EUALGAE workshop of algae bioproducts for early stage researchers, Valladolid, Spain, 04. 04. 2016.
Marta Plavšić, Slađana Strmečki: The characterization of polysaccharides in seawater accessed by electrochemical methods. Book of abstracts ( ISSBN 978-84-608-9990-7), 04-07. 09. 2016, Interfaces Against Pollution Conference ( IAP 2016), Llieda, Spain.
Members of the project AMBIOMERES are participating in the following COST Actions:
1. 2016 COST Action CA15121 -Advancing marine conservation in the European and contiguous seas(MarCons)
2. 2015 COST Action ES1408 -The European network for algal-bioproducts(EUALGAE)
3. 2016 COST Action CA15217 - Ocean Governance for Sustainability - challenges, options and the role of science.