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Filamentous cyanobacteria in the Baltic Sea - spatiotemporal patterns and nitrogen fixation
Stockholms universitet, Naturvetenskapliga fakulteten, Systemekologiska institutionen.
2007 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: Systemekologiska institutionen , 2007. , s. 32
Emneord [en]
Aphanizomenon sp., Nodularia spumigena, Baltic Sea, image analysis, spatial variability, nitrogen fixation, vertical migration
Forskningsprogram
marin ekologi
Identifikatorer
URN: urn:nbn:se:su:diva-7099ISBN: 978-91-7155-512-0 (tryckt)OAI: oai:DiVA.org:su-7099DiVA, id: diva2:197624
Disputas
2007-11-02, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 8 C, Stockholm, 10:00
Opponent
Veileder
Tilgjengelig fra: 2007-10-11 Laget: 2007-10-05bibliografisk kontrollert
Delarbeid
1. Automated measurements of filamentous cyanobacteria by digital image analysis
Åpne denne publikasjonen i ny fane eller vindu >>Automated measurements of filamentous cyanobacteria by digital image analysis
2007 Inngår i: Limnology and Oceanography: Methods, Vol. 5, s. 217-224Artikkel i tidsskrift (Fagfellevurdert) Published
Identifikatorer
urn:nbn:se:su:diva-24471 (URN)000248743300001 ()
Merknad
Part of urn:nbn:se:su:diva-7099Tilgjengelig fra: 2007-10-11 Laget: 2007-10-05bibliografisk kontrollert
2. The effect of hose diameter on depth-integrated sampling of filamentous cyanobacteria
Åpne denne publikasjonen i ny fane eller vindu >>The effect of hose diameter on depth-integrated sampling of filamentous cyanobacteria
Manuskript (Annet vitenskapelig)
Identifikatorer
urn:nbn:se:su:diva-24472 (URN)
Merknad
Part of urn:nbn:se:su:diva-7099Tilgjengelig fra: 2007-10-11 Laget: 2007-10-05 Sist oppdatert: 2010-01-13bibliografisk kontrollert
3. Nitrogen fixation and abundance of the diazotrophic cyanobacterium Aphanizomenon sp. in the Baltic Proper
Åpne denne publikasjonen i ny fane eller vindu >>Nitrogen fixation and abundance of the diazotrophic cyanobacterium Aphanizomenon sp. in the Baltic Proper
2007 Inngår i: Marine Ecology Progress Series, ISSN 0171-8630, Vol. 332, s. 107-118Artikkel i tidsskrift (Fagfellevurdert) Published
Identifikatorer
urn:nbn:se:su:diva-24473 (URN)000245542400009 ()
Merknad
Part of urn:nbn:se:su:diva-7099Tilgjengelig fra: 2007-10-11 Laget: 2007-10-05bibliografisk kontrollert
4. Vertical and horizontal distribution of Aphanizomenon sp. and Nodularia spumigena in the Baltic Sea
Åpne denne publikasjonen i ny fane eller vindu >>Vertical and horizontal distribution of Aphanizomenon sp. and Nodularia spumigena in the Baltic Sea
Manuskript (Annet vitenskapelig)
Identifikatorer
urn:nbn:se:su:diva-24474 (URN)
Merknad
Part of urn:nbn:se:su:diva-7099Tilgjengelig fra: 2007-10-11 Laget: 2007-10-05 Sist oppdatert: 2010-01-13bibliografisk kontrollert
5. Experimental vertical migration in Aphanizomenon sp.: the influence on biovolume concentration and filament length
Åpne denne publikasjonen i ny fane eller vindu >>Experimental vertical migration in Aphanizomenon sp.: the influence on biovolume concentration and filament length
Manuskript (Annet vitenskapelig)
Identifikatorer
urn:nbn:se:su:diva-24475 (URN)
Merknad
Part of urn:nbn:se:su:diva-7099Tilgjengelig fra: 2007-10-11 Laget: 2007-10-05 Sist oppdatert: 2010-01-13bibliografisk kontrollert

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