The thesis investigates the effects of “jumping genes” in cyanobacteria. Genes that move between different locations in a bacterial genome cause genomic changes that can be both harmful and beneficial for the bacterium. The thesis investigates jumping genes in both symbiotic bacteria and in bacteria inhabiting the Baltic Sea. Both these environments have forced bacteria to adapt to new environments, either to the host organism or to the brackish water of the Baltic Sea. Jumping genes can facilitate the adaption to new environments, and were hence found in considerably larger amounts in recent symbionts and in bacteria of the Baltic Sea.

Theo Vigil Stenman defends his thesis. Faculty opponent is Siv Andersson from the University of Uppsala.

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