title: Web of ecological interactions in an experimental gut microbiota.
abstract: The dynamics of all ecosystems are dictated by intrinsic, density-dependent mechanisms and by density-independent environmental forcing. In spite of the importance of the gastrointestinal microbiota in health and disease, the ecology of this system remains largely unknown. Here, we take an ecological approach to gut microbial community analysis, with statistical modelling of time series data from chemostats. This approach removes effects of host forcing, allowing us to describe a network of intrinsic interactions determining the dynamic structure of an experimental gut microbiota. Surprisingly, the main colonization pattern in this simplified model system resembled that of the human infant gut, suggesting a potentially important role of density-dependent interactions in the early gut microbiota. Knowledge of ecological structures in microbial systems may provide us with a means of controlling such systems by modifying the strength and nature of interactions among microbes and between the microbes and their environment.
authors.affiliation: Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biology, University of Oslo, Oslo N-0316, Norway.
authors.forename: Pål
authors.initials: P
authors.lastname: Trosvik
authors.forename: Knut
authors.initials: K
authors.lastname: Rudi
authors.forename: Knut Olav
authors.initials: KO
authors.lastname: Straetkvern
authors.forename: Kjetill S
authors.initials: KS
authors.lastname: Jakobsen
authors.forename: Tormod
authors.initials: T
authors.lastname: Naes
authors.forename: Nils Chr
authors.initials: NC
authors.lastname: Stenseth
mesh_terms: D001419:Bacteria / Q000145:classification / Q000254:growth & development*; D001439:Bacteroides / Q000254:growth & development; D001644:Bifidobacterium / Q000378:metabolism; D003016:Clostridium perfringens / Q000254:growth & development; D017753:Ecosystem; D004926:Escherichia coli / Q000254:growth & development; D041981:Gastrointestinal Tract / Q000382:microbiology*; D056265:Microbial Interactions; D008954:Models, Biological