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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Abstract

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 > Interdisciplinary Natural Sciences NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science
Divisions:	Center for Marine Research
Projects:	Project title Project leader Project code Project type Mehanizam dugoročnih promjena u ekosustavu sjevernog Jadrana [38614] Robert Precali 098-0982705-2731 MZOS Struktura i fiziologija mikrobnih zajednica frontalnih zona sjevernog Jadrana [83206] Mirjana Najdek-Dragić 098-0982705-2729 MZOS
Depositing User:	Ingrid Ivančić
Date Deposited:	20 Dec 2013 10:39
URI:	http://fulir.irb.hr/id/eprint/1222
DOI:	10.1016/j.marenvres.2009.08.004

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