Title Biogeochemical budgets of nutrients and metabolism in the Curonian Lagoon (South East Baltic Sea): spatial and temporal variations /
Authors Vybernaite-Lubiene, Irma ; Zilius, Mindaugas ; Bartoli, Marco ; Petkuviene, Jolita ; Zemlys, Petras ; Magri, Monia ; Giordani, Gianmarco
DOI 10.3390/w14020164
Full Text Download
Is Part of Water.. Basel : MDPI. 2022, vol. 14, iss. 2, art. no. 164, p. 1-18.. eISSN 2073-4441
Keywords [eng] LOICZ/FEC ; nutrients ; sink–source role ; net ecosystem metabolism ; retention
Abstract [eng] Estuaries are biogeochemical reactors able to modulate the transfer of energy and matter from the watershed to the coastal zones and to retain or remove large amounts of terrestrially generated nutrients. However, they may switch from nutrient sink to source depending upon interannual variability of the nutrient supply and internal processes driving whole system metabolism (e.g., net autotrophic or heterotrophic). We tested this hypothesis in the Curonian Lagoon, a hypertrophic estuary located in the south east Baltic Sea, following the budget approach developed in the Land-Ocean Interactions in the Coastal Zone (LOICZ) project. Annual budgets for nitrogen (N), phosphorus (P), and silica (Si) were calculated for the 2013–2015 period. The lagoon was divided in a flushed, nutrient loaded area, and in a confined, less loaded area. The lagoon was always a sink for dissolved inorganic Si and P whereas it was a N sink in the confined area, dominated by denitrification, and a N source in the flushed area, due to dinitrogen (N2) fixation. The net ecosystem metabolism (NEM) indicated that the Curonian Lagoon was mainly autotrophic because of high primary production rates. In this turbid system, low N:P ratio, high summer temperatures, and calm weather conditions support high production of N2-fixing cyanobacteria, suppressing the estuarine N-sink role.
Published Basel : MDPI
Type Journal article
Language English
Publication date 2022
CC license CC license description