Northern Adriatic mesocosm experiment Rovinj 2003: oceanographic conditions at the sampling station

Đakovac, Tamara; Supić, Nastjenjka; Degobbis, Danilo; Kraus, Romina; Precali, Robert; Ivančić, Ingrid; Svetličić, Vesna; Smodlaka, Nenad (2004) Northern Adriatic mesocosm experiment Rovinj 2003: oceanographic conditions at the sampling station. Periodicum Biologorum, 106 (1). pp. 7-15. ISSN 0031-5362

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Abstract

Background and purpose: A mesocosm experiment with nutrient enriched seawater was performed to verify if important production of particles, considered as mucilage precursors occur in the northern Adriatic in May, when semi-enclosed circulation is well developed and plankton growth with phosphorus limited. In this paper, the oceanographic and biological characteristics of the sampled area were described and evaluated by comparison with historical data. Materials and Methods: Geostrophic currents, temperature, salinity, density, oxygen saturation, nutrients, Chla, POC, DOC, microphytoplankton, and heterotrophic bacteria and nanoflagellates were determined by methods widely used in oceanography. Surface active (SAP) and gel particle (GeP) concentrations were measured electrochemically. Results and conclusions: An anticyclonic gyre was observed in May 2003 in the open northern Adriatic, including the sampling station, in which freshened waters were retained. In these conditions nutrient, chlorophyll a concentrations, as well as phytoplankton and bacterial abundances did not differ essentially from long term averages, in spite of extremely low Po River discharge rates. In contrast, the content of SAP, and probably of GeP as well, was exceptionally high. All identified microphytoplankton species are often present in May at the sampling station. The diatom Dactyliosolen fragilissimus highly dominated the microphytoplankton community in the sea.

Item Type:	Article
Uncontrolled Keywords:	Po River flow; geostrophic currents; oceanographic parameters; nutrients; DOC; POC; microphytoplankton; bacteria; nanoflagellates; microparticles; Northern Adriatic
Subjects:	NATURAL SCIENCES > Geology NATURAL SCIENCES > Chemistry NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science
Divisions:	Center for Marine Research Division for Marine and Enviromental Research
Projects:	Project title Project leader Project code Project type Mehanizam dugoročnih promjena u ekosustavu Jadranskog mora Danilo Degobbis 0098111 UNSPECIFIED Istraživanje plimne i dužeperiodične dinamike sjevernog Jadrana Milivoj Kuzmić 0098113 UNSPECIFIED Međupovršinski procesi i eutrofikacija Vera Žutić 0098127 UNSPECIFIED
Depositing User:	Romina Kraus
Date Deposited:	01 Jul 2019 15:18
URI:	http://fulir.irb.hr/id/eprint/4602

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