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Phytoplankton and bacterial alkaline phosphatase activity in the northern Adriatic Sea

Ivančić, Ingrid; Fuks, Dragica; Radić, Tomislav; Lyons, Daniel Mark; Šilović, Tina; Kraus, Romina; Precali, Robert (2010) Phytoplankton and bacterial alkaline phosphatase activity in the northern Adriatic Sea. Marine Environmental Research, 69 (2). pp. 85-94. ISSN 0141-1136

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The importance of bacterial, phytoplankton and dissolved alkaline phosphatase activity (APA) in the northern Adriatic was investigated during 2006. In surface waters total APA increased from early spring (0.07–0.08 µmol/l/h) to late spring (up to 4.64 µmol/l/h) and remained relatively high during the summer (0.46–0.71 µmol/l/h1), due to an increase in specific phytoplankton (up to 30 nmol/µg C/h) and bacterial APA (up to 17.11 nmol/µg C/h). Activity of free enzymes was not important. During late spring and summer both communities exploited dissolved organic phosphorus although, taking into account biomass, phytoplankton activity usually dominated over bacterial activity. In autumn an extra P supply from deeper waters drastically reduced phytoplankton APA, though not bacterial APA, in upper waters. Probably in these months bacteria that were degrading phytoplankton produced organic matter were P limited. In deeper waters APA was low and mainly due to the activity of free enzymes.

Item Type: Article
Uncontrolled Keywords: APA; Nutrients; DOP; Phytoplankton; Bacteria; Northen Adriatic
Subjects: NATURAL SCIENCES > Geology
NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science
Divisions: Center for Marine Research
Project titleProject leaderProject codeProject type
Struktura i fiziologija mikrobnih zajednica frontalnih zona sjevernog Jadrana-Mirjana Najdek-Dragić098-0982705-2729MZOS
Mehanizam dugoročnih promjena u ekosustavu sjevernog Jadrana-Robert Precali098-0982705-2731MZOS
Depositing User: Romina Kraus
Date Deposited: 02 Jul 2019 07:44
DOI: 10.1016/j.marenvres.2009.08.004

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