Population expansions shared among coexisting bacterial lineages are revealed by genetic evidence
Comparative population studies can help elucidate the influence of historical events upon current patterns of biodiversity among taxa that coexist in a given geographic area. In particular, comparative assessments derived from population genetics and coalescent theory have been used to investigate p...
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doaj-b1d4d5d8fd0349ff900722d9190cbee32020-11-24T23:01:59ZengPeerJ Inc.PeerJ2167-83592014-12-012e69610.7717/peerj.696696Population expansions shared among coexisting bacterial lineages are revealed by genetic evidenceMorena Avitia0Ana E. Escalante1Eria A. Rebollar2Alejandra Moreno-Letelier3Luis E. Eguiarte4Valeria Souza5Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, México DF, MéxicoDepartamento de Ecología de la Biodiversidad, Laboratorio Nacional de Ciencias de la Sostenibilidad, Instituto de Ecología, Universidad Nacional Autónoma de México, México DF, MéxicoDepartamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, México DF, MéxicoDivision of Biology, Imperial College London, Silwood Park Campus, Ascot, Berkshire, UKDepartamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, México DF, MéxicoDepartamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, México DF, MéxicoComparative population studies can help elucidate the influence of historical events upon current patterns of biodiversity among taxa that coexist in a given geographic area. In particular, comparative assessments derived from population genetics and coalescent theory have been used to investigate population dynamics of bacterial pathogens in order to understand disease epidemics. In contrast, and despite the ecological relevance of non-host associated and naturally occurring bacteria, there is little understanding of the processes determining their diversity. Here we analyzed the patterns of genetic diversity in coexisting populations of three genera of bacteria (Bacillus, Exiguobacterium, and Pseudomonas) that are abundant in the aquatic systems of the Cuatro Cienegas Basin, Mexico. We tested the hypothesis that a common habitat leaves a signature upon the genetic variation present in bacterial populations, independent of phylogenetic relationships. We used multilocus markers to assess genetic diversity and (1) performed comparative phylogenetic analyses, (2) described the genetic structure of bacterial populations, (3) calculated descriptive parameters of genetic diversity, (4) performed neutrality tests, and (5) conducted coalescent-based historical reconstructions. Our results show a trend of synchronic expansions across most populations independent of both lineage and sampling site. Thus, we provide empirical evidence supporting the analysis of coexisting bacterial lineages in natural environments to advance our understanding of bacterial evolution beyond medical or health-related microbes.https://peerj.com/articles/696.pdfHistorical demographyCoalescenceCuatro cienegasBacterial population geneticsMLST |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Morena Avitia Ana E. Escalante Eria A. Rebollar Alejandra Moreno-Letelier Luis E. Eguiarte Valeria Souza |
spellingShingle |
Morena Avitia Ana E. Escalante Eria A. Rebollar Alejandra Moreno-Letelier Luis E. Eguiarte Valeria Souza Population expansions shared among coexisting bacterial lineages are revealed by genetic evidence PeerJ Historical demography Coalescence Cuatro cienegas Bacterial population genetics MLST |
author_facet |
Morena Avitia Ana E. Escalante Eria A. Rebollar Alejandra Moreno-Letelier Luis E. Eguiarte Valeria Souza |
author_sort |
Morena Avitia |
title |
Population expansions shared among coexisting bacterial lineages are revealed by genetic evidence |
title_short |
Population expansions shared among coexisting bacterial lineages are revealed by genetic evidence |
title_full |
Population expansions shared among coexisting bacterial lineages are revealed by genetic evidence |
title_fullStr |
Population expansions shared among coexisting bacterial lineages are revealed by genetic evidence |
title_full_unstemmed |
Population expansions shared among coexisting bacterial lineages are revealed by genetic evidence |
title_sort |
population expansions shared among coexisting bacterial lineages are revealed by genetic evidence |
publisher |
PeerJ Inc. |
series |
PeerJ |
issn |
2167-8359 |
publishDate |
2014-12-01 |
description |
Comparative population studies can help elucidate the influence of historical events upon current patterns of biodiversity among taxa that coexist in a given geographic area. In particular, comparative assessments derived from population genetics and coalescent theory have been used to investigate population dynamics of bacterial pathogens in order to understand disease epidemics. In contrast, and despite the ecological relevance of non-host associated and naturally occurring bacteria, there is little understanding of the processes determining their diversity. Here we analyzed the patterns of genetic diversity in coexisting populations of three genera of bacteria (Bacillus, Exiguobacterium, and Pseudomonas) that are abundant in the aquatic systems of the Cuatro Cienegas Basin, Mexico. We tested the hypothesis that a common habitat leaves a signature upon the genetic variation present in bacterial populations, independent of phylogenetic relationships. We used multilocus markers to assess genetic diversity and (1) performed comparative phylogenetic analyses, (2) described the genetic structure of bacterial populations, (3) calculated descriptive parameters of genetic diversity, (4) performed neutrality tests, and (5) conducted coalescent-based historical reconstructions. Our results show a trend of synchronic expansions across most populations independent of both lineage and sampling site. Thus, we provide empirical evidence supporting the analysis of coexisting bacterial lineages in natural environments to advance our understanding of bacterial evolution beyond medical or health-related microbes. |
topic |
Historical demography Coalescence Cuatro cienegas Bacterial population genetics MLST |
url |
https://peerj.com/articles/696.pdf |
work_keys_str_mv |
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