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Louca S. The rates of global bacterial and archaeal dispersal. ISME J. 2021;16(1):159-167doi: 10.1038/s41396-021-01069-8.
Louca, S. (2022). The rates of global bacterial and archaeal dispersal. The ISME journal, 16(1), 159-167. https://doi.org/10.1038/s41396-021-01069-8
Louca, Stilianos. "The rates of global bacterial and archaeal dispersal." The ISME journal vol. 16,1 (2022): 159-167. doi: https://doi.org/10.1038/s41396-021-01069-8
Louca S. The rates of global bacterial and archaeal dispersal. ISME J. 2022 Jan;16(1):159-167. doi: 10.1038/s41396-021-01069-8. Epub 2021 Jul 19. PMID: 34282284; PMCID: PMC8692594.
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ISME J. 2022 Jan;16(1):159-167. doi: 10.1038/s41396-021-01069-8. Epub 2021 Jul 19.

The rates of global bacterial and archaeal dispersal.

The ISME journal

Stilianos Louca

Affiliations

  1. Department of Biology, University of Oregon, Eugene, OR, USA. [email protected].
  2. Institute of Ecology and Evolution, University of Oregon, Eugene, OR, USA. [email protected].

PMID: 34282284 PMCID: PMC8692594 DOI: 10.1038/s41396-021-01069-8

Abstract

The phylogenetic resolution at which microorganisms display geographic endemism, the rates at which they disperse at global scales, and the role of humans on global microbial dispersal are largely unknown. Answering these questions is necessary for interpreting microbial biogeography, ecology, and macroevolution and for predicting the spread of emerging pathogenic strains. To resolve these questions, I analyzed the geographic and evolutionary relationships between 36,795 bacterial and archaeal ("prokaryotic") genomes from ∼7000 locations around the world. I find clear signs of continental-scale endemism, including strong correlations between phylogenetic divergence and geographic distance. However, the phylogenetic scale at which endemism generally occurs is extremely small, and most "species" (defined by an average nucleotide identity ≥ 95%) and even closely related strains (average nucleotide identity ≥ 99.9%) are globally distributed. Human-associated lineages display faster dispersal rates than other terrestrial lineages; the average net distance between any two human-associated cell lineages diverging 50 years ago is roughly 580 km. These results suggest that many previously reported global-scale microbial biogeographical patterns are likely the result of recent or current environmental filtering rather than geographic endemism. For human-associated lineages, estimated transition rates between Europe and North America are particularly high, and much higher than for non-human associated terrestrial lineages, highlighting the role that human movement plays in global microbial dispersal. Dispersal was slowest for hot spring- and terrestrial subsurface-associated lineages, indicating that these environments may act as "isolated islands" of microbial evolution.

© 2021. The Author(s), under exclusive licence to International Society for Microbial Ecology.

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