Disentangling the effect of host-genotype and environment on the microbiome of the coral Acropora tenuis

Glasl, Bettina, Smith, Caitlin E., Bourne, David G., and Webster, Nicole S. (2019) Disentangling the effect of host-genotype and environment on the microbiome of the coral Acropora tenuis. PeerJ, 7. e6377.

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Abstract

Genotype-specific contributions to the environmental tolerance and disease susceptibility of corals are widely accepted. Yet our understanding of how host genotype influences the composition and stability of the coral microbiome subjected to environmental fluctuations is limited. To gain insight into the community dynamics and environmental stability of microbiomes associated with distinct coral genotypes, we assessed the microbial community associated with Acropora tenuis under single and cumulative pressure experiments. Experimental treatments comprised either a single pulse of reduced salinity (minimum of 28 psu) or exposure to the cumulative pressures of reduced salinity (minimum of 28 psu), elevated seawater temperature (+2°C), elevated pCO2(900 ppm), and the presence of macroalgae. Analysis of 16S rRNA gene amplicon sequence data revealed that A. tenuis microbiomes were highly host-genotype specific and maintained high compositional stability irrespective of experimental treatment. On average, 48% of the A. tenuis microbiome was dominated by Endozoicomonas. Amplicon sequence variants (ASVs) belonging to this genus were significantly different between host individuals. Although no signs of stress were evident in the coral holobiont and the vast majority of ASVs remained stable across treatments, a microbial indicator approach identified 26 ASVs belonging to Vibrionaceae, Rhodobacteraceae, Hahellaceae, Planctomycetes, Phylobacteriaceae, Flavobacteriaceae, and Cryomorphaceae that were significantly enriched in corals exposed to single and cumulative stressors. While several recent studies have highlighted the efficacy of microbial indicators as sensitive markers for environmental disturbance, the high host-genotype specificity of coral microbiomes may limit their utility and we therefore recommend meticulous control of host-genotype effects in coral microbiome research.

Item ID: 57486
Item Type: Article (Research - C1)
ISSN: 2167-8359
Copyright Information: Copyright 2019 Glasl et al. Distributed under Creative Commons CC-BY 4.0
Funders: Advance Queensland PhD Scholarship, AIMS@JCU, Great Barrier Reef Marine Park Authority (GBRMPA)
Projects and Grants: GBRMPA Science for Management Awards
Date Deposited: 21 Mar 2019 01:31
FoR Codes: 06 BIOLOGICAL SCIENCES > 0605 Microbiology > 060504 Microbial Ecology @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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