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Northern Adriatic mesocosm experiment Rovinj 2003: nutrient dynamics

Ivančić, Ingrid; Degobbis, Danilo; Pečar, Osvin; Fuks, Dragica; Manganelli, Maura; Kraus, Romina; Đakovac, Tamara; Precali, Robert; Scenati, Raffaele (2004) Northern Adriatic mesocosm experiment Rovinj 2003: nutrient dynamics. Periodicum Biologorum, 106 (1). pp. 17-22. ISSN 0031-5362

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Abstract

Background and Background and Purpose: Nutrient dynamics and influence on the plankton community of the northern Adriatic were studied during a month in 25 L mesocosms, enriched with nutrients in different ratios ("balanced", N/P=16 and "P-deficient", N/P=100), with the aim to contribute to understanding the production mechanism of microparticles, considered as precursors of the mucilage phenomenon. Materials and Methods: Seawater for the experiment was collected in May 2003 in a frontal zone between oligotrophic and eutrophic waters in the northern Adriatic, 20 Nm W off Rovinj (Istria). Seawater in 25 L bottles was enriched with nutrients and incubated floating on the sea surface. Analyses of nutrients and other relevant parameters were performed with methods widely used in oceanography. Results: Orthophosphate uptake occurred already in conditions of low phytoplankton biomass. Uptake of nitrate and orthosilicate was delayed for about a week in respect to orthophosphate, i.e. started only when phytoplankton biomass developed significantly. The bloom intensity was lower in "P-deficient" conditions, but not as low as predictable from the different orthophosphate enrichment in the two mesocosms. However, much higher alkaline phosphatase activity was induced in the "P-deficient" than in "nutrient balanced" mesocosm. Conclusions: In "P-deficient" mesocosm, orthophosphate was used more efficiently than in "nutrient balanced", due to rapid recycling by alkaline phosphatase. Furthermore, the N/P ratio of produced organic matter differed considerably between the two mesocosms, suggesting that phytoplankton in the northern Adriatic can grow over a broad range of N/P ratios.

Item Type: Article
Uncontrolled Keywords: nutrients; N/P ratio; alkaline phosphatase; chlorophyll a; bacteria; mesocosm; Northern Adriatic
Subjects: NATURAL SCIENCES > Chemistry
NATURAL SCIENCES > Biology
NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science
Divisions: Center for Marine Research
Projects:
Project titleProject leaderProject codeProject type
Mehanizam dugoročnih promjena u ekosustavu Jadranskog moraDanilo Degobbis0098111UNSPECIFIED
Depositing User: dr. sc. Romina Kraus
Date Deposited: 01 Jul 2019 15:22
Last Modified: 01 Jul 2019 15:22
URI: http://fulir.irb.hr/id/eprint/4601

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