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Welcome to the home page of the Department of Symbiosis

The Department of Symbiosis studies the biology and ecology of associations between bacteria and eukaryotes, with our main emphasis on marine invertebrates from chemosynthetic environments such as sulfide-rich coastal sediments, vents and seeps.

Our research on symbioses between microbes and animals is centered around three questions:

Who are the symbiotic partners?

This question is easy to answer for the animal side of the symbiosis, but it remains a challenge to reveal the true diversity of microorganisms, even in such low-diversity habitats as symbioses.


What are they doing?

What is the metabolism of the symbionts? Which pathways do the symbionts use to gain energy and feed their host? How do the symbionts sequester carbon, nitrogen, and sulfur from the environment?


How has the symbiosis evolved?

How have biogeography, environmental conditions, and phylogenetic relationships influenced the evolution of the symbiosis? How have the partners adapted to the symbiosis?

Bathymodiolus shells
Oligochaete symbionts
3D reconstruction of symbiont distribution inside the mussel tissue
Deep Sea worm Osedax mucofloris (by Helena Wiklund)
Olavius Algarvensis (SEM picture)