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Ecological Importance of Alkaline Phosphatase Activity in Changing Marine Environmental Conditions

Ivančić, Ingrid; Kraus, Romina; Najdek-Dragić, Mirjana; Cozzi, Stefano (2021) Ecological Importance of Alkaline Phosphatase Activity in Changing Marine Environmental Conditions. Water, 13 . ISSN 2073-4441

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The effects of changing hydrological and climatic conditions on the dynamics of phosphorus (P) were studied in the Northern Adriatic Sea (NA), a coastal system currently affected by these changes. P limitation is one of the key stresses in the NA and it is a globally important phenomenon in aquatic ecosystems. Therefore, the response to P stress by inducing alkaline phosphatase activity (APA) was studied in characteristic water types in the NA, formed by the changing freshwater input in different thermic conditions. APA was important in providing P for microbial growth in upper waters dominated by assimilation during the warmer part of the year in stratified conditions. Contrarily, APA was not important during mixing in the colder part of the year, as well as in waters dominated by regeneration. In waters influenced by freshwater, temperature had no effect on APA, while in high-salinity waters, temperature was an important factor for APA increase. The highest APA occurred during riverine nutrients supply, indicating that the alteration of anthropogenic nutrient loads might strongly change P status in this coastal system. Furthermore, predicted increases in winter sea temperature and summer Po River discharge could delay the water column mixing, prolonging periods of P limitation.

Item Type: Article
Uncontrolled Keywords: P limitation ; alkaline phosphatase activity ; climate changes ; nutrients ; organic phosphorus ; microbial biomass ; continental shelf ; Northern Adriatic
Subjects: NATURAL SCIENCES > Geology
NATURAL SCIENCES > Interdisciplinary Natural Sciences
Divisions: Center for Marine Research
Project titleProject leaderProject codeProject type
Struktura i fiziologija mikrobnih zajednica frontalnih zona sjevernog JadranaNajdek-Dragić, Mirjana098-0982705-2729MZOS
Mehanizam dugoročnih promjena u ekosustavu sjevernog JadranaPrecali, Robert098-0982705-2731MZOS
Depositing User: Romina Kraus
Date Deposited: 12 Nov 2021 13:48
DOI: 10.3390/w13192750

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