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Bacterial diversity across individual lichens.

Alexandra A Mushegian1, Celeste N Peterson, Christopher C M Baker

  • 1Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138, USA. amushegian@gmail.com

Applied and Environmental Microbiology
|May 3, 2011
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Summary

Bacterial communities in lichens are structured by ecological succession. Lichen centers host richer, more stable bacterial assemblages than their edges, indicating distinct habitat conditions influence microbial diversity.

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Published on: January 2, 2015

Area of Science:

  • Microbial Ecology
  • Symbiotic Microbiology
  • Lichenology

Background:

  • Symbiotic relationships, such as those found in lichens, create unique microhabitats that support diverse bacterial communities.
  • Understanding the spatial distribution of microbes within these symbiotic associations is crucial for deciphering ecological dynamics.

Purpose of the Study:

  • To investigate the spatial diversity of bacterial communities within and across multiple lichen individuals.
  • To determine if distinct zones within lichens (center vs. edge) exhibit differences in bacterial community structure and composition.

Main Methods:

  • Utilized terminal restriction fragment length polymorphism (T-RFLP) for initial community profiling.
  • Employed high-throughput pyrosequencing for in-depth analysis of bacterial community composition.
  • Surveyed bacterial assemblages across multiple individuals of closely related lichen species.

Main Results:

  • Lichen centers exhibited significantly richer and more consistent bacterial assemblages compared to lichen edges.
  • Bacterial communities at lichen edges were species-poor and compositionally disparate.
  • Spatial location within the lichen significantly influenced bacterial community structure.

Conclusions:

  • Ecological succession appears to be a key factor structuring bacterial communities within lichens.
  • Distinct microhabitat conditions between lichen centers and edges drive differences in microbial community assembly.
  • The lichen body provides a spatially structured environment influencing symbiotic bacterial diversity.