Extensive blooms of N2-fixing cyanobacteria occur regularly during summer in the Baltic Sea. In this thesis N2-fixation of common cyanobacteria in the Baltic Sea and the direct fate of newly fixed nitrogen in otherwise nitrogen-impoverished waters were investigated. The results advance our understanding of biogeochemical cycles and ecosystem functioning in relation to cyanobacterial blooms in the Baltic Sea with relevance for both ecosystem-based management in the Baltic Sea, and N2-fixation and nitrogen cycling in the global ocean.

Isabell Klawonn defends her doctoral thesis. Faculty opponent is Lasse Riemann from the University of Copenhagen.

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