Title: Routes and rates of bacterial dispersal impact surface soil microbiome composition and functioning

Journal Article · · The ISME Journal

Abstract Recent evidence suggests that, similar to larger organisms, dispersal is a key driver of microbiome assembly; however, our understanding of the rates and taxonomic composition of microbial dispersal in natural environments is limited. Here, we characterized the rate and composition of bacteria dispersing into surface soil via three dispersal routes (from the air above the vegetation, from nearby vegetation and leaf litter near the soil surface, and from the bulk soil and litter below the top layer). We then quantified the impact of those routes on microbial community composition and functioning in the topmost litter layer. The bacterial dispersal rate onto the surface layer was low (7900 cells/cm2/day) relative to the abundance of the resident community. While bacteria dispersed through all three routes at the same rate, only dispersal from above and near the soil surface impacted microbiome composition, suggesting that the composition, not rate, of dispersal influenced community assembly. Dispersal also impacted microbiome functioning. When exposed to dispersal, leaf litter decomposed faster than when dispersal was excluded, although neither decomposition rate nor litter chemistry differed by route. Overall, we conclude that the dispersal routes transport distinct bacterial communities that differentially influence the composition of the surface soil microbiome.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of California, Irvine, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science (BSS)
Grant/Contract Number:
AC02-05CH11231; SC0020382
OSTI ID:
1874627
Journal Information:
The ISME Journal, Journal Name: The ISME Journal Journal Issue: 10 Vol. 16; ISSN 1751-7362
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United Kingdom
Language:
English

References (64)

Belowground responses to elevation in a changing cloud forest journal February 2016
Fungi exposed to chronic nitrogen enrichment are less able to decay leaf litter journal January 2017
Variation in range size and dispersal capabilities of microbial taxa journal January 2018
Microbial decomposers not constrained by climate history along a Mediterranean climate gradient in southern California journal June 2018
Temporal variability and effect of environmental variables on airborne bacterial communities in an urban area of Northern Italy journal October 2012
Characterization of Aureobasidium pullulans isolated from airborne spores in Thailand journal January 2003
Decomposition of 51 semidesert species from wide-ranging phylogeny is faster in standing and sand-buried than in surface leaf litters: implications for carbon and nutrient dynamics journal July 2015
Phyllosphere microbiology journal June 2002
Seed rain, soil seed bank, seed loss and regeneration of Castanopsis fargesii (Fagaceae) in a subtropical evergreen broad-leaved forest journal January 2007
Plant species effects on nutrient cycling: revisiting litter feedbacks journal June 2015
Tandem Fluorescence Measurements of Organic Matter and Bacteria Released in Sea Spray Aerosols journal March 2021
Experimental tests of the bacterial distance–decay relationship journal June 2010
Fungal community on decomposing leaf litter undergoes rapid successional changes journal October 2012
Effects of patch connectivity and heterogeneity on metacommunity structure of planktonic bacteria and viruses journal November 2012
Ultra-high-throughput microbial community analysis on the Illumina HiSeq and MiSeq platforms journal March 2012
Potential sources of microbial colonizers in an initial soil ecosystem after retreat of an alpine glacier journal January 2016
Temporal variation overshadows the response of leaf litter microbial communities to simulated global change journal May 2015
Microbial legacies alter decomposition in response to simulated global change journal October 2016
Effects of dispersal and selection on stochastic assembly in microbial communities journal August 2016
Dispersal alters bacterial diversity and composition in a natural community journal October 2017
Dispersal timing determines the importance of priority effects in bacterial communities journal October 2017
Plant litter decomposition in a semi-arid ecosystem controlled by photodegradation journal August 2006
Bayesian community-wide culture-independent microbial source tracking journal July 2011
Microbial biogeography: putting microorganisms on the map journal February 2006
Abundance and survival of microbial aerosols in the troposphere and stratosphere journal July 2019
Reproducible, interactive, scalable and extensible microbiome data science using QIIME 2 journal July 2019
Decomposition responses to climate depend on microbial community composition journal November 2018
Rapid determination of 16S ribosomal RNA sequences for phylogenetic analyses. journal October 1985
Dispersal and Species Diversity: A Meta‐Analysis journal June 2006
Conceptual Synthesis in Community Ecology journal June 2010
Investigating the culturable atmospheric fungal and bacterial microbiome in West Texas: implication of dust storms and origins of the air parcels journal September 2020
The SILVA ribosomal RNA gene database project: improved data processing and web-based tools journal November 2012
The UNITE database for molecular identification of fungi: handling dark taxa and parallel taxonomic classifications journal October 2018
Relationships between fungal community composition in decomposing leaf litter and home‐field advantage effects journal April 2019
Contribution of different dispersal sources to the metabolic response of lake bacterioplankton following a salinity change journal December 2016
Distribution of thermophilic endospores in a temperate estuary indicate that dispersal history structures sediment microbial communities: Dispersal structures sediment microbial communities journal February 2018
Dispersal alters soil microbial community response to drought journal July 2019
New insights into the structure and function of phyllosphere microbiota through high-throughput molecular approaches journal August 2013
Dispersal enhances beta diversity in nectar microbes journal June 2017
An experimental analysis of species sorting and mass effects in freshwater bacterioplankton journal July 2014
Measuring ectomycorrhizal fungal dispersal: macroecological patterns driven by microscopic propagules: MEASURING MYCORRHIZAL FUNGAL DISPERSAL journal June 2012
The effect of bagging branches on levels of endophytic fungal infection in Japanese beech leaves journal April 2004
Measurement of Horizontal and Vertical Movement of Ralstonia solanacearum in Soil journal October 2006
The metacommunity concept: a framework for multi-scale community ecology: The metacommunity concept journal June 2004
Local and regional factors influencing bacterial community assembly: Bacterial community assembly journal April 2011
Do bacterial and fungal communities assemble differently during primary succession? journal January 2014
Life in leaf litter: novel insights into community dynamics of bacteria and fungi during litter decomposition journal August 2016
Gene flow and the geographic structure of natural populations journal May 1987
Indoor-Air Microbiome in an Urban Subway Network: Diversity and Dynamics journal August 2014
Ecological Succession and Stochastic Variation in the Assembly of Arabidopsis thaliana Phyllosphere Communities journal December 2013
Biotic Interactions Are More Important than Propagule Pressure in Microbial Community Invasions journal October 2020
A Latitudinal Diversity Gradient in Terrestrial Bacteria of the Genus Streptomyces journal April 2016
Optimization of a Method To Quantify Soil Bacterial Abundance by Flow Cytometry journal October 2019
How Does It Feel to Be Like a Rolling Stone? Ten Questions About Dispersal Evolution journal December 2007
The Importance of Dispersal for Bacterial Community Composition and Functioning journal October 2011
Needles of Pinus halepensis as Biomonitors of Bioaerosol Emissions journal November 2014
Pitfall Trap Size and Capture of Three Taxa of Litter-Dwelling Arthropods: Implications for Biodiversity Studies journal June 2002
Altered water and nitrogen input shifts succession in a southern California coastal sage community journal September 2014
Biological Determinants of Species Diversity journal January 1985
Airborne Bacteria in Earth's Lower Stratosphere Resemble Taxa Detected in the Troposphere: Results From a New NASA Aircraft Bioaerosol Collector (ABC) journal August 2018
Historical Factors Associated With Past Environments Influence the Biogeography of Thermophilic Endospores in Arctic Marine Sediments journal February 2019
Microbial Shifts Following Five Years of Cover Cropping and Tillage Practices in Fertile Agroecosystems journal November 2020
Dispersal of Salmonella Typhimurium by Rain Splash onto Tomato Plants journal March 2012
Endosymbiont interference and microbial diversity of the Pacific coast tick, Dermacentor occidentalis , in San Diego County, California journal January 2017