DNA evidence for global dispersal and probable endemicity of protozoa

BMC Evolutionary Biology
David BassThomas Cavalier-Smith

Abstract

It is much debated whether microbes are easily dispersed globally or whether they, like many macro-organisms, have historical biogeographies. The ubiquitous dispersal hypothesis states that microbes are so numerous and so easily dispersed worldwide that all should be globally distributed and found wherever growing conditions suit them. This has been broadly upheld for protists (microbial eukaryotes) by most morphological and some molecular analyses. However, morphology and most previously used evolutionary markers evolve too slowly to test this important hypothesis adequately. Here we use a fast-evolving marker (ITS1 rDNA) to map global diversity and distribution of three different clades of cercomonad Protozoa (Eocercomonas and Paracercomonas: phylum Cercozoa) by sequencing multiple environmental gene libraries constructed from 47-80 globally-dispersed samples per group. Even with this enhanced resolution, identical ITS sequences (ITS-types) were retrieved from widely separated sites and on all continents for several genotypes, implying relatively rapid global dispersal. Some identical ITS-types were even recovered from both marine and non-marine samples, habitats that generally harbour significantly different protist communit...Continue Reading

References

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Citations

Dec 14, 2012·The ISME Journal·Scott T BatesNoah Fierer
Mar 16, 2012·The ISME Journal·Dominic Mao, Dennis Grogan
Oct 18, 2013·The ISME Journal·María AguilarThomas Cavalier-Smith
Oct 18, 2007·Proceedings. Biological Sciences·David BassThomas A Richards
Jan 8, 2008·Journal of Biology·Luciano B Beheregaray, Adalgisa Caccone
Feb 25, 2014·BMC Evolutionary Biology·Sigrid NeuhauserDavid Bass
Mar 31, 2012·Annual Review of Marine Science·David A CaronAstrid Schnetzer
Sep 17, 2015·Environmental Microbiology·Edward A D Mitchell
Jul 26, 2011·Protist·Alexis T HoweThomas Cavalier-Smith
Mar 10, 2016·The ISME Journal·Christoffer Bugge HarderFlemming Ekelund
Nov 4, 2009·The Journal of Eukaryotic Microbiology·David BassThomas A Richards
Apr 2, 2009·The Journal of Eukaryotic Microbiology·Jan Pawlowski, Fabien Burki
May 29, 2013·The Journal of Eukaryotic Microbiology·Vera Tai, Patrick J Keeling
Jul 7, 2010·Environmental Microbiology·Edvard GlücksmanDavid Bass
Jun 13, 2012·Molecular Ecology·Marie RagonPurificación López-García
Nov 4, 2010·Journal of Evolutionary Biology·J WolinskaS Giessler
Mar 1, 2012·Molecular Ecology·Simon Creer, Frederic Sinniger
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Datasets Mentioned

BETA
EF174336
EF174385

Methods Mentioned

BETA
PCR
light microscopy
electron microscopy
scrapings
electrophoresis

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