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Vertical and horizontal distribution of Aphanizomenon sp. and Nodularia spumigena in the Baltic Sea
Stockholms universitet, Naturvetenskapliga fakulteten, Systemekologiska institutionen.
Manuskript (Övrigt vetenskapligt)
Identifikatorer
URN: urn:nbn:se:su:diva-24474OAI: oai:DiVA.org:su-24474DiVA, id: diva2:197622
Anmärkning
Part of urn:nbn:se:su:diva-7099Tillgänglig från: 2007-10-11 Skapad: 2007-10-05 Senast uppdaterad: 2010-01-13Bibliografiskt granskad
Ingår i avhandling
1. Filamentous cyanobacteria in the Baltic Sea - spatiotemporal patterns and nitrogen fixation
Öppna denna publikation i ny flik eller fönster >>Filamentous cyanobacteria in the Baltic Sea - spatiotemporal patterns and nitrogen fixation
2007 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: Systemekologiska institutionen, 2007. s. 32
Nyckelord
Aphanizomenon sp., Nodularia spumigena, Baltic Sea, image analysis, spatial variability, nitrogen fixation, vertical migration
Forskningsämne
marin ekologi
Identifikatorer
urn:nbn:se:su:diva-7099 (URN)978-91-7155-512-0 (ISBN)
Disputation
2007-11-02, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 8 C, Stockholm, 10:00
Opponent
Handledare
Tillgänglig från: 2007-10-11 Skapad: 2007-10-05Bibliografiskt granskad

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