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Nitrogen as the nutrient limiting the algal growth potential, for summer natural assemblages in the Gulf of Riga, eastern Baltic Sea ArchiMer
Maestrini, Serge; Balode, Maija; Bechemin, Christian; Purina, Ingrida; Botva, Uldis.
Nutrients potentially limiting the maximal biomass of natural assemblages were studied on the basis of samples collected in late July 1997, along a transect from the mouth of the river Daugava to the central part of the Gulf of Riga. The inorganic nutrient concentrations decreased strongly between the river mouth and the central part of the gulf from 17.3 to <1 mu M NO sub(3) super(-)+NO sub(2) super(-)+NH sub(4) super(+) (DIN), and from 3.5 to 0.03 mu M PO sub(4) super(3-). DIN : PO sub(4) super(3-) increased from 5 to 20. Similar trends occurred for SiO sub(3) super(2-) whose concentration decreased from 72 to 1.6 mu M, but DIN : SiO sub(3) super(2-) only halved. Comparison of DIN : P-PO sub(4) super(3-) ratios (atom : atom) with the Redfield's value...
Tipo: Text Palavras-chave: Limiting nutrient; Algal growth potential; Natural assemblages; Gulf of Riga; Baltic Sea.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00173/28439/26771.pdf
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Nitrogenous organic substances as potential nitrogen sources, for summer phytoplankton in the Gulf of Riga, eastern Baltic Sea ArchiMer
Maestrini, Serge; Balode, Maija; Bechemin, Christian; Purina, Ingrida.
To investigate whether uptake of dissolved organic compounds might favour the growth potential of toxic cyanobacteria and dinoflagellates, surface water was collected in late July 1997 in the Gulf of Riga, and enriched with different nitrogen sources. (1) Organic substances were added (25 mu M N) under P-, Si- and Fe-replete conditions. Urea sustained a biomass increase (protein content) 20% greater than that with NH sub(4) super(+). Glycine, hypoxanthine and putrescine gave only 50% of the biomass obtained with NH sub(4) super(+). Glutamic acid and spermine supported growth in only one case each, and guanine in none. (2) The >1000 dalton fraction of dissolved organic matter (DOM) taken from the Daugava River was provided at concentrations of 5, 15 and...
Tipo: Text Palavras-chave: Phytoplankton; Terrigenous DON; Nitrogenous nutrients; Baltic Sea.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00173/28437/26769.pdf
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Nutrients limiting the Algal Growth Potential (AGP) in the Gulf of Riga, eastern Baltic Sea, in spring and early summer 1996 ArchiMer
Maestrini, Serge; Balode, Maija; Bechemin, Christian; Purina, Ingrida; Verite, Celine.
In May, June and July 1996, samples wcre collected along one transect greatly influenced by river discharge (eastern side of the gulf), along one transect slightly influence by river discharge (western side), at one station Iocated in the mouth of the main river (River Daugava), at one station located in the center of the Gulf and at several nearshore locations of the western side. Ratios of rnolecular concentrations of in situ dissolved ioorganic nitrogen, phosphorus and silicon, as weIl as enrichment bioassays were llsed to dctcrrnine which nutrient (s) lirnited the potential biomass of phytoplankton. Both comparison of (NO.d-N02+NJ.L): P04 (DIN: DIP) values with Redfic1d's ratio and bioassay inspection led to the sarne conclusions. Phosphorus was...
Tipo: Text
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00353/46409/46135.pdf
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Stimulation of nitrogen-fixing cyanobacteria in a Baltic Sea plankton community by land-derived organic matter or iron addition ArchiMer
Stolte, Willem; Balode, Maija; Carlsson, Per; Grzebyk, Daniel; Janson, Sven; Lips, Inga; Panosso, Renata; Ward, Clive J.; Graneli, Edna.
In the Baltic Sea, floating blooms of nitrogen-fixing cyanobacteria occur yearly during late summer. These blooms can sometimes be limited by iron. Due to extensive foresting around the Baltic Sea, iron is entering the Baltic Sea partly bound to dissolved organic material (DOM) via rivers. An experiment was performed in 300 1 laboratory mesocosms to test the hypothesis that riverine high-molecular weight dissolved organic matter (HMWDOM), extracted by tangential flow filtration > 1000 Da, stimulates the biomass of nitrogen-fixing cyanobacteria, by increasing the availability of iron. The addition of iron/EDTA and of DOM resulted in 5 to 10 times higher biomass of nitrogen-fixing cyanobacteria. Accordingly, higher primary production and particulate...
Tipo: Text Palavras-chave: Mesocosm experiment; Humic acid; HMWDOM; High molecular weight dissolved organic matter; Iron; Nitrogen fixation; Cyanobacteria.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2470.pdf
Registros recuperados: 4
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