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Fitness effects of host-bacterial interactions – the microbial perspective

View ORCID ProfilePeter Deines, View ORCID ProfileKatrin Hammerschmidt, View ORCID ProfileThomas CG Bosch
doi: https://doi.org/10.1101/609271
Peter Deines
1Zoological Institute, Christian Albrechts University Kiel, 24118 Kiel, Germany
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  • For correspondence: pdeines@zoologie.uni-kiel.de
Katrin Hammerschmidt
2Institute of General Microbiology, Christian Albrechts University Kiel, 24118 Kiel, Germany
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Thomas CG Bosch
1Zoological Institute, Christian Albrechts University Kiel, 24118 Kiel, Germany
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Abstract

Organisms and their resident microbial communities form a complex and mostly stable ecosystem. It is known that the specific composition and abundance of certain bacterial species affect host health and Darwinian fitness, but the processes that lead to these microbial patterns are unknown.

We investigate this by deconstructing the simple microbiome of the freshwater polyp Hydra. We contrast the performance of its two main bacterial associates, Curvibacter and Duganella, on germ free hosts with two in vitro environments over time. We show that interactions within the microbiome but also host modulation lead to the observed species frequencies and abundances. More specifically we find that rare microbiome members are essential for achieving the observed community composition, which ultimately sets the maximum carrying capacity. Bacterial fitness strongly depends on the environment: while Duganella performs better than Curvibacter in a non-host habitat, Curvibacter benefits through the host association.

This is of particular interest because Curvibacter and its host show a history of co-evolution, as inferred from phylogenies, whereas the colonization with Duganella seems to be a recent event. Our findings oppose the assumption that bacteria always benefit through the association with the host and poses questions regarding the long-term maintenance of such relationships.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted April 16, 2019.
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Fitness effects of host-bacterial interactions – the microbial perspective
Peter Deines, Katrin Hammerschmidt, Thomas CG Bosch
bioRxiv 609271; doi: https://doi.org/10.1101/609271
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Fitness effects of host-bacterial interactions – the microbial perspective
Peter Deines, Katrin Hammerschmidt, Thomas CG Bosch
bioRxiv 609271; doi: https://doi.org/10.1101/609271

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