Biogeographical patterns in soil bacterial communities across the Arctic region

Malard, Lucie; Anwar, Muhammad Zohaib; Jacobsen, Carsten Suhr; Pearce, David A.

doi:10.1101/655431

Cited by 13 publications

(19 citation statements)

References 67 publications

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“…This suggests that soil microclimate, which better expresses the temperature and moisture conditions affecting below‐ground and ground‐dwelling organisms and which can be strongly decoupled from air temperature in space and time (see also Bramer et al., 2018; Graae et al., 2012; Scherrer & Körner, 2011; Suggitt et al., 2011), likely also better explains the distributions of soil microorganisms. Furthermore, other edaphic factors (particularly soil pH) and biotic interactions are known to be major drivers for the diversity and community structure of soil fungi and bacteria (Bahram et al., 2018; Bates et al., 2013; Fierer et al., 2009; Li et al., 2018; Malard, Anwar, Jacobsen, & Pearce, 2019; Yashiro et al., 2016), and also but to a lesser extent for the diversity of protists (Seppey et al., 2020). Thus, they can also be expected to strongly contribute to explain the distribution of individual soil microorganisms.…”

Section: Discussionmentioning

confidence: 99%

Greater topoclimatic control of above‐ versus below‐ground communities

Mod

Scherrer

Cola

et al. 2020

Global Change Biology

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Assessing the degree to which climate explains the spatial distributions of different taxonomic and functional groups is essential for anticipating the effects of climate change on ecosystems. Most effort so far has focused on above-ground organisms, which offer only a partial view on the response of biodiversity to environmental gradients. Here including both above-and below-ground organisms, we quantified the degree of topoclimatic control on the occurrence patterns of >1,500 taxa and phylotypes along a This is an open access article under the terms of the Creat ive Commo ns Attri butio n-NonCo mmerc ial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Section: Discussionmentioning

confidence: 99%

Greater topoclimatic control of above‐ versus below‐ground communities

Mod

Scherrer

Cola

et al. 2020

Global Change Biology

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“…Biogeographical patterns have been identified in the phyllosphere of other tree species [ 15 , 80 ]. However, few studies have examined the biogeographical patterns of different microbial populations in the phyllosphere (e.g., rare versus abundant and core versus non-core taxa) as in other environments [ 16 , 45 , 81 ]. Our results revealed that biogeographical patterns were strongest in non-core taxa, exhibiting a non-random distribution across space and environmental gradients that contrasted with the cosmopolitan distribution of the relatively dominant core microbiome.…”

Section: Discussionmentioning

confidence: 99%

A core phyllosphere microbiome exists across distant populations of a tree species indigenous to New Zealand

et al. 2020

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The phyllosphere microbiome is increasingly recognised as an influential component of plant physiology, yet it remains unclear whether stable host-microbe associations generally exist in the phyllosphere. Leptospermum scoparium (mānuka) is a tea tree indigenous to New Zealand, and honey derived from mānuka is widely known to possess unique antimicrobial properties. However, the host physiological traits associated with these antimicrobial properties vary widely, and the specific cause of such variation has eluded scientists despite decades of research. Notably, the mānuka phyllosphere microbiome remains uncharacterised, and its potential role in mediating host physiology has not been considered. Working within the prevailing core microbiome conceptual framework, we hypothesise that the phyllosphere microbiome of mānuka exhibits specific host association patterns congruent with those of a microbial community under host selective pressure (null hypothesis: the mānuka phyllosphere microbiome is recruited stochastically from the surrounding environment). To examine our hypothesis, we characterised the phyllosphere and associated soil microbiomes of five distinct and geographically distant mānuka populations across the North Island of New Zealand. We identified a habitat-specific and relatively abundant core microbiome in the mānuka phyllosphere, which was persistent across all samples. In contrast, non-core phyllosphere microorganisms exhibited significant variation across individual host trees and populations that was strongly driven by environmental and spatial factors. Our results demonstrate the existence of a dominant and ubiquitous core microbiome in the phyllosphere of mānuka, supporting our hypothesis that phyllosphere microorganisms of mānuka exhibit specific host association and potentially mediate physiological traits of this nationally and culturally treasured indigenous plant. In addition, our results illustrate biogeographical patterns in mānuka phyllosphere microbiomes and offer insight into factors contributing to phyllosphere microbiome assembly.

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“…Total organic carbon, pH and conductivity were identified as the key drivers of bacterial diversity across the Arctic landscape and are also commonly identified in studies across the globe (8,(34)(35)(36)(37)(38). While pH was previously identified as the primary driver of bacterial diversity in Arctic soils across the whole Arctic region (19); here, at the landscape scale, TOC was identified as the primary factor influencing bacterial community structure and was tightly linked with soil moisture. Generally, soil organic carbon content increases with increasing precipitation and decreasing temperature (39).…”

Section: Key Environmental Factors Influencing Bacterial Communitiesmentioning

confidence: 73%

“…S1] across an Arctic landscape [Fig 1]. Indeed, while the role of environmental parameters such as pH (17,18), total organic content (TOC) (19), moisture content (20) and C:N ratio (21) on community composition in the Arctic has been demonstrated, much less is known about the influence of spatial parameters (19). However, determining the influence of environmental factors on communities remains an essential step to avoid overestimating the role of the spatial scale.…”

Section: Introductionmentioning

confidence: 99%

Influence of Spatial Scale on Structure of Soil Bacterial Communities across an Arctic Landscape

Malard

Anwar

Jacobsen

et al. 2021

Appl Environ Microbiol

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Bacterial community composition is largely influenced by environmental factors, and this applies to the Arctic region. However, little is known about the role of spatial factors in structuring such communities. In this study, we evaluated the influence of spatial scale on bacterial community structure across an Arctic landscape. Our results showed that spatial factors accounted for approximately 10% of the variation at the landscape scale, equivalent to observations across the whole Arctic region, suggesting that while the role and magnitude of other processes involved in community structure may vary, the role of dispersal may be stable globally in the region. We assessed dispersal limitation by identifying the spatial autocorrelation distance, standing at approximately 60 m, which would be required in order to obtain fully independent samples and may inform future sampling strategies in the region. Finally, indicator taxa with strong statistical correlations with environment variables were identified. However, we showed that these strong taxa-environment associations may not always be reflected in the geographical distribution of these taxa. IMPORTANCE The significance of this study is threefold. It investigated the influence of spatial scale on the soil bacterial community composition across a typical Arctic landscape and demonstrated that conclusions reached when examining the influence of specific environmental variables on bacterial community composition are dependent upon the spatial scales over which they are investigated. This study identified a dispersal limitation (spatial autocorrelation) distance of approximately 60 m, required to obtain samples with fully independent bacterial communities, and therefore, should serve to inform future sampling strategies in the region and potentially elsewhere. The work also showed that strong taxa-environment statistical associations may not be reflected in the observed landscape distribution of the indicator taxa.

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Biogeographical patterns in soil bacterial communities across the Arctic region

Cited by 13 publications

References 67 publications

Greater topoclimatic control of above‐ versus below‐ground communities

Greater topoclimatic control of above‐ versus below‐ground communities

A core phyllosphere microbiome exists across distant populations of a tree species indigenous to New Zealand

Influence of Spatial Scale on Structure of Soil Bacterial Communities across an Arctic Landscape

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