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Phenotypic Comparability from Genotypic Variability among Physically Structured Microbial Consortia.

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Microbial communities in Hawaiian orange crusts show distinct genetic makeup across layers, with island geography influencing composition more than layer type. This suggests convergent evolution drives similar appearances in different locations.

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Area of Science:

  • Microbial Ecology
  • Marine Biology
  • Genomics

Background:

  • Microbiomes, encompassing diverse microorganisms, significantly influence host development, health, and disease.
  • Understanding the genome-to-phenome connection necessitates examining microbial consortia organization and host interactions.
  • Laminated microbial crusts in Hawaii's anchialine ecosystems offer a unique model for studying microbial consortia structure.

Purpose of the Study:

  • To elucidate the genetic constituents within phenotypically similar layers of Hawaiian orange cyanobacterial-bacterial crusts.
  • To investigate how microbial community structure relates to geographic location and layer depth within these unique ecosystems.
  • To understand the functional implications of microbial arrangement in relation to oxygen gradients.

Main Methods:

  • High-throughput amplicon sequencing of ribosomal RNA hypervariable regions (Bacteria-specific V6 and Eukarya-biased V9).
  • Analysis of genetic constituents across distinct, phenotypically analogous layers (top orange, second orange, pink, green).
  • Comparative analysis of microbial similarity based on geographic site, island, and crust layer.

Main Results:

  • Microbial richness increased with crust layer depth.
  • Samples from the same geographic site were more similar to each other across layers than to analogous layers from different sites.
  • Samples from the same island were more similar regardless of layer than to analogous layers from other islands.
  • Cyanobacterial and algal taxa were abundant in surface/bottom layers; anaerobic/chemoautotrophic taxa concentrated in middle layers.

Conclusions:

  • Hawaiian orange crusts exhibit distinct genetic organization despite phenotypic similarity, driven by island-level factors.
  • The arrangement of oxygenated and anoxygenated niches is functionally unique compared to other laminated communities.
  • Convergent evolution, influenced by similar environmental conditions, is a likely driver for these observed microbial consortia.