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Primary production in the Adriatic Sea - a review with emphasis on new data obtained at Lastovo Island

The primary production (PP) supports the marine food web, and affects global biogeochemical cycles [1]. Therefore, measuring and monitoring PP is of huge importance for tracking ecosystem responses to the anthropogenic-driven climate change. PP can be measured in-situ, 14C technique being widely used [2], or it can be estimated by satellite remote sensing [1], and different models [3, 4]. Remote sensing and modeling estimate global PP at large spatial and temporal scale, but they have their own restrictions [4] and require in-situ data for algorithm validation [3]. As a result, in-situ time-series data is of significant importance for PP modeling in world oceans [3]. Continuous PP in-situ measurements using 14C technique are done since April 1962 at two stations in the Central Adriatic Sea: coastal Kaštela Bay and open sea Stončica station. Time- series data was corrected for overestimates of daily production using non-linear production model, and five decadal regimes were observed: 1962-1979 (118 mg C m-2), 1979-1997 (300 mg C m- 2), 1997-2008 (128 mg C m-2), 2008-2013 (251 mg C m-2), and the last one is ongoing since 2013 (154 mg C m-2) with a trend of PP decrease [3].Overall, models reveal global decrease of PP in Mediterranean. However, there is a trend of increase in Adriatic Sea [4], which may be due to enhanced anthropogenic nutrient input, and climate change effects. We conducted 14C in-situ PP measurements at Lastovo and Korčula Islands during the ISLAND project field experiment in June 2022 (i.e., during water layer thermal stratification). Daily integrated NPP was calculated: 185.50 mg C m-2 d-1 at station Maslovnjak (north of Lastovo Island), 190.04 mg C m-2 d-1 at station Struga (south of Lastovo Island), and 80.77 mg C m-2 d-1 at station Prižba (Korčula Island). More in-situ experiments are planned for the future in order to compare data points to satellite remote sensing data and to model algorithms for the future PP estimates in the Adriatic. REFERENCES [1] F. P. Chavez et al., Annu. Rev. Mar. Sci. 3 (2011) 227–260. [2] E. S. Nielsen et al., ICES J. Mar. Sci. 18 (1952) 117–140. [3] Ž. Kovač et al., Remote Sens. 10 (2018) 1460. [4] P. M. Salgado-Hernanz et al., Biogeosciences 19 (2022) 47–69.

primary production, Adriatic Sea, Lastovo Island

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