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Title: Convergent bacterial microbiotas in the fungal agricultural systems of insects

The ability to cultivate food is an innovation that has produced some of the most successful ecological strategies on the planet. Although most well recognized in humans, where agriculture represents a defining feature of civilization, species of ants, beetles, and termites have also independently evolved symbioses with fungi that they cultivate for food. Despite occurring across divergent insect and fungal lineages, the fungivorous niches of these insects are remarkably similar, indicating convergent evolution toward this successful ecological strategy. Here, we characterize the microbiota of ants, beetles, and termites engaged in nutritional symbioses with fungi to define the bacterial groups associated with these prominent herbivores and forest pests. Using culture-independent techniques and the in silico reconstruction of 37 composite genomes of dominant community members, we demonstrate that different insect-fungal symbioses that collectively shape ecosystems worldwide have highly similar bacterial microbiotas comprised primarily of the genera Enterobacter, Rahnella, and Pseudomonas. Although these symbioses span three orders of insects and two phyla of fungi, we show that they are associated with bacteria sharing high whole-genome nucleotide identity. Due to the fine-scale correspondence of the bacterial microbiotas of insects engaged in fungal symbioses, our findings indicate that this represents an example of convergence ofmore » entire host-microbe complexes.« less
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [4] ;  [4] ;  [5] ;  [1] ;  [6] ;  [1]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. Max Planck Institute for Chemical Ecology, Jena (Germany)
  3. Univ. of Wisconsin, Madison, WI (United States); Smithsonian Tropical Research Institute, Balboa, Ancon (Panama)
  4. Dept. of Energy Joint Genome Institute, Walnut Creek, CA (United States)
  5. Univ. of Copenhagen, Copenhagen (Denmark)
  6. Southern Research Station, Asheville, NC (United States)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
AC02-05CH11231; FC02-07ER64494
Accepted Manuscript
Journal Name:
mBio (Online)
Additional Journal Information:
Journal Name: mBio (Online); Journal Volume: 5; Journal Issue: 6; Journal ID: ISSN 2150-7511
American Society for Microbiology
Research Org:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States