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Protein Networks02:26

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The global Microcystis interactome.

Katherine V Cook1,2, Chuang Li3, Haiyuan Cai1

  • 1Plankton Ecology and Limnology Laboratory, Department of Biology The University of Oklahoma Norman Oklahoma.

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Harmful cyanobacterial blooms (cyanoHABs) feature a consistent bacterial microbiome globally. This study supports the hypothesized cyanoHAB interactome, revealing shared bacterial communities associated with Microcystis aeruginosa across continents.

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Area of Science:

  • Microbial ecology
  • Aquatic microbiology
  • Cyanobacterial bloom dynamics

Background:

  • Bacteria are crucial for aquatic ecosystems, yet their role in harmful cyanobacterial blooms (cyanoHABs) remains understudied.
  • Harmful cyanobacterial bloom species influence bacterial communities and depend on bacterial functions, suggesting a coevolved cyanoHAB interactome.
  • The composition and biogeography of bacteria associated with cyanoHABs are largely unknown.

Purpose of the Study:

  • To test the hypothesized Microcystis interactome by surveying the bacterial microbiome associated with Microcystis aeruginosa blooms globally.
  • To investigate the diversity and biogeography of bacteria associated with harmful cyanobacterial blooms.
  • To determine if microbiome composition and functional potential are similar across global Microcystis blooms.

Main Methods:

  • 16S rRNA gene sequencing was used to analyze bacterial communities associated with Microcystis aeruginosa blooms.
  • Metagenomic analysis was employed to assess the functional potential of the whole bacterial community.
  • Samples were collected from 12 lakes across four continents to capture a wide geographic distribution.

Main Results:

  • Microcystis aeruginosa was found to be cosmopolitan, present in lakes across a broad latitudinal and longitudinal gradient.
  • Bacterial microbiome communities showed high similarity across global blooms, with abundant taxa shared across most sites.
  • No evidence of dispersal limitation was found for either Microcystis or its associated microbiome bacteria.
  • Metagenomic analysis revealed complementary biochemical pathways between Microcystis and its associated bacteria.

Conclusions:

  • The study provides initial support for the hypothesized Microcystis interactome, demonstrating a high degree of similarity in associated bacterial communities across global blooms.
  • The findings suggest that specific functional groups of bacteria are consistently associated with Microcystis blooms worldwide.
  • This conserved microbial community structure has implications for understanding and potentially managing harmful cyanobacterial blooms.