Spatiotemporal patterns of N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; fixation in coastal waters derived from rate measurements and remote sensing

Žilius, Mindaugas; Vybernaitė-Lubienė, Irma; Vaičiūtė, Diana; Overlingė, Donata; Grinienė, Evelina; Zaiko, Anastasija; Bonaglia, Stefano; Liskow, Iris; Voß, Maren; Andersson, Agneta; Brügel, Sonia; Politi, Tobia; Bukaveckas, Paul A.

doi:10.5194/bg-18-1857-2021

Cited by 11 publications

(2 citation statements)

References 72 publications

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“…A prove of Nfixation by cyanobacteria, that would indicate a real N shortage, is still lacking for the Szczecin Lagoon. This is very different in comparable lagoons, such as the Curonian Lagoon (Zilius et al, 2021).…”

Section: Long-term Development Of Water Qualitymentioning

confidence: 84%

Macrophytes and water quality in a large Baltic lagoon: relevance, development and restoration perspectives

et al. 2023

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We combine historical and recent monitoring data with modeling to get a better insight into water quality development of the large Oder/Szczecin Lagoon at the German/Polish border in the southern Baltic Sea region and especially of the role of macrophytes. Data indicates that the system is eutrophic for centuries and a naturally eutrophic system. During the last decades, external nutrient loads decreased but still keep the system in a eutrophic state. The systems primary production is limited by light and nitrogen and cannot be sufficiently managed by external nutrient load reductions. We consider 36% macrophyte coverage of the lagoon area as potential historical maximum. Despite its shallowness the lagoon was never a macrophyte dominated, clear water system. About 31% of the lagoon area would be covered by macrophytes in a good ecological status according to the European Water Framework Directive. However, the existing water transparency targets seem too ambitious and not realistic. Changes in macrophyte coverage on water quality are restricted to near shore areas and hardly affect the open lagoon. Existing models require an improved representation of water transparency and effects on macrophyte colonization depth. Presently the patchy macrophyte coverage is only about 12% of the lagoon area. This low coverage and a relatively poor species composition results in a non-satisfactory state classification. However, ecologically valuable angiosperms and charophytes seem to recover. A strict avoidance of mechanical disturbances could be a measure to support macrophyte re-colonization. A systematic improvement of piscivorous fish stocks may be a supporting measure to reduce eutrophication. Restoration perspectives and consequences for environmental policies are discussed.

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Section: Long-term Development Of Water Qualitymentioning

confidence: 84%

Macrophytes and water quality in a large Baltic lagoon: relevance, development and restoration perspectives

et al. 2023

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“…During the summer-autumn seasons, cyanobacteria are the main phytoplankton component. Among them, Aphanizomenon spp., Planktothrix agardhii, Dolichospermum spp., Microcystis spp., Woronichinia compacta, Limnothrix redekei are dominant [1,7,8]. Cyanobacteria and eukaryotic microalgae, mainly diatoms and green algae, generate a high diversity of metabolites, with an important ecological function and/or potential of biotechnological application.…”

Section: Introductionmentioning

confidence: 99%

Phytoplankton of the Curonian Lagoon as a New Interesting Source for Bioactive Natural Products. Special Impact on Cyanobacterial Metabolites

et al. 2021

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The bioprospecting of marine and brackish water systems has increased during the last decades. In this respect, microalgae, including cyanobacteria, and their metabolites are one of the most widely explored resources. Most of the bioactive compounds are isolated from ex situ cultures of microorganisms; however, analysis of field samples could also supply valuable information about the metabolic and biotechnological potential of microalgae communities. In this work, the activity of phytoplankton samples from the Curonian Lagoon was studied. The samples were active against antibiotic resistant clinical and environmental bacterial strains as well as against serine proteases and T47D human breast adenocarcinoma cells. No significant effect was found on Daphnia magna. In addition, using LC-MS/MS, we documented the diversity of metabolites present in field samples. A list of 117 detected cyanopeptides was presented. Cyanopeptolins constituted the largest class of cyanopeptides. As complex bloom samples were analyzed, no link between the observed activity and a specific sample component can be established. However, the results of the study showed a biotechnological potential of natural products from the Curonian Lagoon.

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Nitrogen fixation rate and phosphorus enrichment effects on diazotrophic cyanobacteria in the Gulf of Riga

Liepina-Leimane,

Barda,

Jurgensone

et al. 2024

Mar Biol

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In eutrophied marine systems such as the Baltic Sea, diazotrophic cyanobacteria have the potential to add additional bioavailable nitrogen (N) to the system through fixation of atmospheric dinitrogen (N2). However, their growth is regarded to be limited by phosphorus availability (P). This study investigates the response of two cyanobacteria species, Aphanizomenon flosaquae and Nodularia spumigena, collected from the Gulf of Riga under different environmental conditions to a short-period dissolved inorganic phosphorus (DIP) enrichment. The samples were collected during the summer cyanobacterial bloom of 2022 in the central region of the Gulf of Riga. Contrary to expectations, neither species demonstrated a significant increase in biomass. The study also established that N2-fixation rates did not correlate directly with the total diazotrophic cyanobacteria biomass, but showed a significant correlation with heterocyst presence in both species addressed during this study. The findings suggest the influence of additional factors beyond DIP availability on the N2-fixing cyanobacteria growth in the Gulf of Riga.

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Spatiotemporal patterns of N<sub>2</sub> fixation in coastal waters derived from rate measurements and remote sensing

Cited by 11 publications

References 72 publications

Macrophytes and water quality in a large Baltic lagoon: relevance, development and restoration perspectives

Macrophytes and water quality in a large Baltic lagoon: relevance, development and restoration perspectives

Phytoplankton of the Curonian Lagoon as a New Interesting Source for Bioactive Natural Products. Special Impact on Cyanobacterial Metabolites

Nitrogen fixation rate and phosphorus enrichment effects on diazotrophic cyanobacteria in the Gulf of Riga

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