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Article

Dissolved Trace Metals and Organic Matter Distribution in the Northern Adriatic, an Increasingly Oligotrophic Shallow Sea

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Division of Marine and Environmental Research, Ruđer Bošković Institute, POB 108, HR-10002 Zagreb, Croatia
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Center for Marine Research, Ruđer Bošković Institute, G. Paliaga 5, HR-52210 Rovinj, Croatia
*
Authors to whom correspondence should be addressed.
Academic Editors: John Zhou and Domenico Cicchella
Water 2022, 14(3), 349; https://doi.org/10.3390/w14030349
Received: 2 November 2021 / Revised: 3 January 2022 / Accepted: 20 January 2022 / Published: 25 January 2022
We report a monthly distribution of Zn, Cd, Pb, Cu, Ni and Co, biologically relevant trace metals (TMs), within one year, in the productive surface layer at two stations with different trophic characters in the northern Adriatic (NA). The TM data was accompanied by a multivariable dataset, including dissolved organic carbon (DOC), surface-active organic substances (SAS), nitrogen-containing polymeric organic material (N-POM), nutrients, pH, dissolved O2, chlorophyll a (Chl a), seawater temperature, and the Po River discharge rate. At the eu- to mesotrophic station 108, the concentrations of dissolved TMs were 5–116 nM for Zn, 0.04–0.18 nM for Cd, 0.05–0.63 nM for Pb, 3–17 nM for Cu, 4–11 nM for Ni, and 0.2–1.2 nM for Co, while at the oligotrophic station 107, they were 6–224 nM for Zn, 0.03–0.16 nM for Cd, 0.05–1.25 nM for Pb, 3–17 nM for Cu, 4–19 nM for Ni, and 0.1–0.7 nM for Co. The characterization of organic matter (OM) in conjunction with the analysis of correlations with TMs indicated that the OM–TMs interactions differed between the two stations; namely, the freshly produced OM detected at station 108 was probably involved in the complexation of Cu, Co, Cd, and Ni, whereas at station 107, such complexation processes were not present. Accumulation of DOC was observed during the summer months at both stations. Our results present a significant contribution to biogeochemical studies in the NA by focusing on the complexity of TM–OM interactions, which is a prerequisite for interpretation of their responses to local and global changes. View Full-Text
Keywords: trace metals; organic matter; surface-active substances; micronutrients; Mediterranean Sea; the northern Adriatic trace metals; organic matter; surface-active substances; micronutrients; Mediterranean Sea; the northern Adriatic
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MDPI and ACS Style

Penezić, A.; Gašparović, B.; Cuculić, V.; Strmečki, S.; Djakovac, T.; Mlakar, M. Dissolved Trace Metals and Organic Matter Distribution in the Northern Adriatic, an Increasingly Oligotrophic Shallow Sea. Water 2022, 14, 349. https://doi.org/10.3390/w14030349

AMA Style

Penezić A, Gašparović B, Cuculić V, Strmečki S, Djakovac T, Mlakar M. Dissolved Trace Metals and Organic Matter Distribution in the Northern Adriatic, an Increasingly Oligotrophic Shallow Sea. Water. 2022; 14(3):349. https://doi.org/10.3390/w14030349

Chicago/Turabian Style

Penezić, Abra, Blaženka Gašparović, Vlado Cuculić, Slađana Strmečki, Tamara Djakovac, and Marina Mlakar. 2022. "Dissolved Trace Metals and Organic Matter Distribution in the Northern Adriatic, an Increasingly Oligotrophic Shallow Sea" Water 14, no. 3: 349. https://doi.org/10.3390/w14030349

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