Unraveling individual and combined toxicity of microplastics and tetracycline at environment-related concentrations to coral holobionts

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: 490, P. 137823 - 137823

Published: March 3, 2025

Language: Английский

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Corals and Their Microbiomes Are Differentially Affected by Exposure to Elevated Nutrients and a Natural Thermal Anomaly

Frontiers in Marine Science, Journal Year: 2018, Volume and Issue: 5

Published: March 28, 2018

Nutrient pollution can increase the prevalence and severity of coral disease bleaching in ambient temperature conditions or during experimental thermal challenge. However, there have been few opportunities to study effects nutrient natural anomalies. Here we present results from an experiment conducted 2014 event Florida Keys, USA, that exposed Agaricia sp. (Undaria) Siderastrea siderea corals 3 types elevated nutrients: nitrogen alone, phosphorous combination phosphorus. Overall, was high regardless treatment, but enrichment alone both prolonged increased mortality corals. At same time, temperatures Dark Spot Syndrome (DSS), a typically associated with cold exposure did not disease, suggesting stress overwhelms on this such extreme event. Analysis 85 microbial metagenomes also showed correlated significant shifts composition function microbiomes, DSS had microbiomes distinct apparently healthy In particular, identified viral, archaeal, fungal families. These were likely driven by other environmental co-variates occurring no taxa signs DSS. Furthermore, although affect alpha diversity, it significantly microbiome beta-diversity, effect independent time. suggest strong anomalies local interact act independently alter health variety ways, ultimately contribute bleaching, reefs Keys.

Language: Английский

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Coral microbiome diversity reflects mass coral bleaching susceptibility during the 2016 El Niño heat wave

Ecology and Evolution, Journal Year: 2019, Volume and Issue: 9(3), P. 938 - 956

Published: Jan. 17, 2019

Repeat marine heat wave-induced mass coral bleaching has decimated reefs in Seychelles for 35 years, but how coral-associated microbial diversity (microalgal endosymbionts of the family Symbiodiniaceae and bacterial communities) potentially underpins broad-scale dynamics remains unknown. We assessed microbiome composition during 2016 wave peak at two contrasting reef sites (clear vs. turbid) Seychelles, key species considered sensitive (Acropora muricata, Acropora gemmifera) or tolerant (Porites lutea, Coelastrea aspera). For all sites, we sampled bleached versus unbleached colonies to examine microbiomes align with stress susceptibility. Over 30% corals 2016, half which were from sp. Pocillopora that largely transitioned mortality by 2017. ITS2-sequencing revealed P. lutea generally associated C3z/C3 C15 types, respectively, whereas C. aspera exhibited a plastic association multiple D types C3z types. 16S rRNA gene sequencing communities host-specific, through differences most abundant families, Hahellaceae (comprising Endozoicomonas), Rhodospirillaceae, Rhodobacteraceae. Both lower diversity, richness, community evenness compared more bleaching-resistant aspera. Different susceptibility among was thus consistent distinct profiles. These profiles conserved across species. As this pattern could also reflect parallel response environmental changes, detailed functional associations will need be determined future studies. Further understanding such microbiome-environmental interactions is likely critical target effective management within oceanically isolated Seychelles.

Language: Английский

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Disentangling causation: complex roles of coral‐associated microorganisms in disease

Environmental Microbiology, Journal Year: 2017, Volume and Issue: 20(2), P. 431 - 449

Published: Oct. 13, 2017

Rapidly changing climate regimes combined with other anthropogenic pressures are implicated in increased disease epizootics among reef building corals, resulting habitat structure. These accumulated stressors directly contribute to outbreaks by compromising the coral host immune system, modulating virulence of microbial pathogens and/or disrupting balance within microbiome holobiont. Disentangling causation has been challenging, and while progress made for certain diseases terms roles associated microorganisms play, it is evident that like marine or terrestrial systems, compromised health cannot always be attributed a single causative agent. Here, we summarize current state knowledge induced diseases, discuss challenges strategies further disentangle causation. With major environmental reefs face over next century, understanding interactions between host, agent(s) lead disease, still priority enable development effective resilience into populations.

Language: Английский

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Comparative genome-centric analysis reveals seasonal variation in the function of coral reef microbiomes

The ISME Journal, Journal Year: 2020, Volume and Issue: 14(6), P. 1435 - 1450

Published: March 2, 2020

Abstract Microbially mediated processes contribute to coral reef resilience yet, despite extensive characterisation of microbial community variation following environmental perturbation, the effect on microbiome function is poorly understood. We undertook metagenomic sequencing sponge, macroalgae and seawater microbiomes from a macroalgae-dominated inshore define their functional potential evaluate seasonal shifts in microbially processes. In total, 125 high-quality metagenome-assembled genomes were reconstructed, spanning 15 bacterial 3 archaeal phyla. Multivariate analysis relative abundance revealed changes relation fluctuations (e.g. biomass, temperature). For example, shift Alphaproteobacteria Bacteroidota-dominated occurred during summer, resulting an increased genomic degrade macroalgal-derived polysaccharides. An 85% reduction Chloroflexota was observed sponge with consequences for nutrition, waste product removal, detoxification holobiont. A Firmicutes:Bacteroidota ratio detected over summer implications polysaccharide degradation macroalgal microbiomes. These results highlight that dominant taxa alter repertoire host-associated microbiomes, how perturbation can affect ecosystems.

Language: Английский

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