期刊
MARINE ENVIRONMENTAL RESEARCH
卷 69, 期 2, 页码 85-94出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marenvres.2009.08.004
关键词
APA; Nutrients; DOP; Phytoplankton; Bacteria; Northern Adriatic
资金
- Ministry of Science, Education and Sport of the Republic of Croatia [098-0982705-2729, 098-0982705-2731]
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 mu mol l(-1) h(-1)) to late spring (up to 4.64 mu mol l(-1) h(-1)) and remained relatively high during the summer (0.46-0.71 mu mol l(-1) h(-1)), due to an increase in specific phytoplankton (up to 30 nmol mu g C(-1) h(-1)) and bacterial APA (up to 17.11 nmol mu g C(-1) h(-1)). 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. (C) 2009 Elsevier Ltd. All rights reserved.
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