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The effect of hose diameter on depth-integrated sampling of filamentous cyanobacteria
Stockholm University, Faculty of Science, Department of Systems Ecology.
Manuscript (Other academic)
URN: urn:nbn:se:su:diva-24472OAI: diva2:197620
Part of urn:nbn:se:su:diva-7099Available from: 2007-10-11 Created: 2007-10-05 Last updated: 2010-01-13Bibliographically approved
In thesis
1. Filamentous cyanobacteria in the Baltic Sea - spatiotemporal patterns and nitrogen fixation
Open this publication in new window or tab >>Filamentous cyanobacteria in the Baltic Sea - spatiotemporal patterns and nitrogen fixation
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Summer blooms of filamentous, diazotrophic cyanobacteria are typical of the Baltic Sea Proper, and are dominated by Aphanizomenon sp. and the toxic Nodularia spumigena. Although occurring every summer, the blooms vary greatly in timing and spatial distribution, making monitoring difficult and imprecise. This thesis studies how the spatial variability of Baltic cyanobacterial blooms influences estimates of abundance, vertical and horizontal distribution and N2-fixation. Implications for sampling and monitoring of cyanobacterial blooms are also discussed.

The results of the thesis confirm the importance of diazotrophic cyanobacteria in providing N for summer production in the Baltic Proper. It also highlights the large spatial and temporal variation in these blooms and argues that improved spatial coverage and replication could make monitoring data more useful for demonstrating time trends, and for identifying the factors regulating the blooms. The vertical distribution of Aphanizomenon and Nodularia was found to be spatially variable, probably as a combination of species-specific adaptations and ambient weather conditions. Vertical migration in Aphanizomenon was more important towards the end of summer, and is probably regulated by a trade-off between P-availability and light and temperature.

Place, publisher, year, edition, pages
Stockholm: Systemekologiska institutionen, 2007. 32 p.
Aphanizomenon sp., Nodularia spumigena, Baltic Sea, image analysis, spatial variability, nitrogen fixation, vertical migration
Research subject
Marine Ecology
urn:nbn:se:su:diva-7099 (URN)978-91-7155-512-0 (ISBN)
Public defence
2007-11-02, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 8 C, Stockholm, 10:00
Available from: 2007-10-11 Created: 2007-10-05Bibliographically approved

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