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    Investigating Spatial Patterns of Variability in Bacterial Communities Inhabiting Arid Avicennia marina Forests

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    Thesis_Thomson_Final.pdf
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    6.228Mb
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    Description:
    MS Thesis
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    Type
    Thesis
    Authors
    Thomson, Timothy cc
    Advisors
    Jones, Burton cc
    Committee members
    Moran, Xose Anxelu G. cc
    Pain, Arnab cc
    Ellis, Joanne I.
    Program
    Marine Science
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Date
    2019-06
    Embargo End Date
    2019-07-08
    Permanent link to this record
    http://hdl.handle.net/10754/655957
    
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    Access Restrictions
    At the time of archiving, the student author of this thesis opted to temporarily restrict access to it. The full text of this thesis became available to the public after the expiration of the embargo on 2019-07-08.
    Abstract
    Mangrove forests provide a suite of critical ecosystem services ranging from local to global scales.Soil conditions and associated micro-organisms play a fundamental role in maintaining these services, that include nutrient cycling, carbon sequestration and plant growth-promoting properties. Despite its importance, the microbial abundance and function of mangrove soil has received little effort in current research. On the ecotone between the land and the sea, mangrove soils are subject to high variability of geomorphological and ecological conditions that imply a strong distinction of ecological niches. These conditions can diversify the structure and function of the prevalent microbiome. To identify the structure of bacterial communities of mangrove soils, 16S rRNA gene sequencing techniques were applied on samples from arid Avicennia marina forests across different spatial scales: (i) at different depths of the soil profile(surface/subsurface); (ii) between two distinct zones within a given forest (seaward/landward); (iii) among forests with varying local hydrodynamic conditions (exposed/sheltered); and (iiii) among forests in different geographic regions (Saudi Arabia and Australia). This study found that the bacterial soil community varied more within each forest than between forests in different countries. Notably, differences between countries became more apparent at the finest taxonomic resolution (ASVs). Bacterial communities from the landward zone of the mangrove forest are more conserved across countries than those from the dynamic seaward zone. Theoretically assigned functions showed high levels of sulfate respiration and chemoheterotrophy as major metabolic pathways. Differences across local factors in the functional traits reflect the within forest variability. The distinct microbial assemblages from the landward zone were associated with high salinity and phosphorus, and nitrogen and larger grain size were associated with the seaward samples. Understanding patterns of microbial communities in mangrove soils is important to predict changes and mitigate anthropogenic pressures on the ecosystem.
    Citation
    Thomson, T. (2019). Investigating Spatial Patterns of Variability in Bacterial Communities Inhabiting Arid Avicennia marina Forests. KAUST Research Repository. https://doi.org/10.25781/KAUST-07O2Z
    DOI
    10.25781/KAUST-07O2Z
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-07O2Z
    Scopus Count
    Collections
    Biological and Environmental Sciences and Engineering (BESE) Division; Marine Science Program; Theses

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