Diverse cryptic refuges for life during glaciation

Pointing, Stephen B.; Bollard-Breen, Barbara; Gillman, Lennard

doi:10.1073/pnas.1403594111

Cited by 24 publications

(14 citation statements)

References 18 publications

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“…An additional reservoir may be the moisture-sufficient soil around lakes where microbial mats are known to persist over inter-annual periods 55 . Local refugia may be important in facilitating resilience at the landscape scale where severe local extinction pressure occurs due to stochasticity and steep environmental gradients for abiotic variables 56 . Challenges remain in deciphering the relationship of diversity patterns to biomass and ecosystem function 32,57 , but the revelation that airborne connectivity is largely localised rather than being an inter-continental scale process emphasises the conservation value of the McMurdo Dry Valleys as a unique ecosystem.…”

Section: Resultsmentioning

confidence: 99%

Microbial dispersal limitation to isolated soil habitats in the McMurdo Dry Valleys of Antarctica

Archer

Lee

Caruso

et al. 2018

Preprint

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Section: Resultsmentioning

confidence: 99%

Microbial dispersal limitation to isolated soil habitats in the McMurdo Dry Valleys of Antarctica

Archer

Lee

Caruso

et al. 2018

Preprint

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“…Glaciation has had strong impacts on the biogeography and genetic diversity of a range of terrestrial species (Conroy and Cook, 2000;Milá et al, 2006;Wilson and Eigenmann Veraguth, 2010;Pointing et al, 2014;Newman and Austin, 2015) and has been shown to impact microbial diversity in soil (Vercken et al, 2010;Boyd et al, 2011;Park et al, 2011;Eisenlord et al, 2012;Stibal et al, 2012;Hamilton et al, 2013). Rapid demographic expansion resulting from glacial retreat has had profound impacts on the genetics of species (Hewitt, 1996;Conroy and Cook, 2000;Hewitt, 2000Hewitt, , 2004Wilson and Eigenmann Veraguth, 2010).…”

Section: Contributions Of Geography To Recombinationmentioning

confidence: 99%

Contributions of ancestral inter-species recombination to the genetic diversity of extant Streptomyces lineages

et al. 2016

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Streptomyces species produce many important antibiotics and have a crucial role in soil nutrient cycling. However, their evolutionary history remains poorly characterized. We have evaluated the impact of homologous recombination on the evolution of Streptomyces using multi-locus sequence analysis of 234 strains that represent at least 11 species clusters. Evidence of inter-species recombination is widespread but not uniform within the genus and levels of mosaicism vary between species clusters. Most phylogenetically incongruent loci are monophyletic at the scale of species clusters and their subclades, suggesting that these recombination events occurred in shared ancestral lineages. Further investigation of two mosaic species clusters suggests that genes acquired by inter-species recombination may have become fixed in these lineages during periods of demographic expansion; implicating a role for phylogeography in determining contemporary patterns of genetic diversity. Only by examining the phylogeny at the scale of the genus is apparent that widespread phylogenetically incongruent loci in Streptomyces are derived from a far smaller number of ancestral inter-species recombination events.

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“…While lichens and mosses are visible as patchily distributed surface biota, the biology of this region is dominated by cryptic microbial communities within soils and rocks (Fraser et al 2014;Pointing et al 2014). These sub-surface communities account for the majority of standing biomass in desert systems (Pointing and Belnap 2012) including polar deserts (Cary et al 2010;Wierzchos et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Genetic signatures indicate widespread antibiotic resistance and phage infection in microbial communities of the McMurdo Dry Valleys, East Antarctica

et al. 2015

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The McMurdo Dry Valleys of Antarctica support extensive yet cryptic microbial communities but little evidence for 'top-down' herbivory control. A question therefore arises as to how standing microbial biomass is regulated. Here, we present results from a survey of soil and rock microbial community metagenomes using the GeoChip microarray that demonstrate antibiotic resistance and phage infection are widespread. We interrogated a range of dry valley locations from maritime to extreme inland sites. Antibiotic resistance genes were identified in three categories: beta-lactamases, tetracycline and vanomycin plus a range of transporter genes. Frequency of recovery generally reflected microbial diversity, with greatest abundance among Halobacteria, Proteobacteria and the photosynthetic bacteria (Chlorobi, Chloroflexi and Cyanobacteria). However, no clear differences between locations and soil/rock communities were apparent. Phage signals were also recovered from all locations in soil and rock communities. The Leviviridae, Myoviridae, Podoviridae and Siphoviridae were ubiquitous . The Corticoviridae occurred only in moisturesufficient hyporheic soils, the Microviridae occurred only in maritime and hyporheic sites and an unidentified group within the order Caudovirales occurred only at dry inland sites. We postulate that widespread antibiotic resistance indicates potential inter-specific interaction and that phage signals indicate possible 'bottom-up' trophic regulation in the dry valleys.

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Diverse cryptic refuges for life during glaciation

Cited by 24 publications

References 18 publications

Microbial dispersal limitation to isolated soil habitats in the McMurdo Dry Valleys of Antarctica

Microbial dispersal limitation to isolated soil habitats in the McMurdo Dry Valleys of Antarctica

Contributions of ancestral inter-species recombination to the genetic diversity of extant Streptomyces lineages

Genetic signatures indicate widespread antibiotic resistance and phage infection in microbial communities of the McMurdo Dry Valleys, East Antarctica

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