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Continental-Scale Gene Flow Prevents Allopatric Divergence of Pelagic Freshwater Bacteria

Hötzinger, Matthias and Pitt, Alexandra and Huemer, Andrea and Hahn, Martin W. (2021). Continental-Scale Gene Flow Prevents Allopatric Divergence of Pelagic Freshwater Bacteria. Genome Biology and Evolution. 13 , evab019
[Research article]

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Abstract

Allopatric divergence is one of the principalmechanisms for speciation of macro-organisms. Microbes by comparison are assumed to disperse more freely and to be less limited by dispersal barriers. However, thermophilic prokaryotes restricted to geothermal springs have shown clear signals of geographic isolation, but robust studies on this topic for microbes with less strict habitat requirements are scarce. Furthermore, it has only recently been recognized that homologous recombination among conspecific individuals provides species coherence in a wide range of prokaryotes. Recombination barriers thus may define prokaryotic species boundaries, yet, the extent to which geographic distance between populations gives rise to such barriers is an open question. Here, we investigated gene flow and population structure in a widespread species of pelagic freshwater bacteria, Polynucleobacter paneuropaeus. Through comparative genomics of 113 conspecific strains isolated from freshwater lakes and ponds located across a North-South range of more than 3,000 km, we were able to reconstruct past gene flow events. The species turned out to be highly recombinogenic as indicated by significant signs of gene transfer and extensive genome mosaicism. Although genomic differences increased with spatial distance on a regional scale (<170 km), such correlations were mostly absent on larger scales up to 3,400 km. We conclude that allopatric divergence in European P. paneuropaeus is minor, and that effective gene flow across the sampled geographic range in combination with a high recombination efficacy maintains species coherence.

Authors/Creators:Hötzinger, Matthias and Pitt, Alexandra and Huemer, Andrea and Hahn, Martin W.
Title:Continental-Scale Gene Flow Prevents Allopatric Divergence of Pelagic Freshwater Bacteria
Series Name/Journal:Genome Biology and Evolution
Year of publishing :2021
Volume:13
Article number:evab019
Number of Pages:18
Publisher:OXFORD UNIV PRESS
ISSN:1759-6653
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:pelagic freshwater bacteria, microbial evolutionary ecology, gene flow, homologous recombination, Polynucleobacter, allopatric speciation
URN:NBN:urn:nbn:se:slu:epsilon-p-111681
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-111681
Additional ID:
Type of IDID
DOI10.1093/gbe/evab019
Web of Science (WoS)000637216700013
ID Code:23424
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:05 May 2021 13:23
Metadata Last Modified:05 May 2021 13:31

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