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  • 1
    Online Resource
    Online Resource
    Insights into the bacterial community composition of farmed Caulerpa lentillifera : A comparison between contrasting health states
    Wiley ; 2021
    In:  MicrobiologyOpen Vol. 10, No. 6 ( 2021-12)
    Details
    In: MicrobiologyOpen, Wiley, Vol. 10, No. 6 ( 2021-12)
    Abstract: The bacterial communities of Caulerpa lentillifera were studied during an outbreak of an unknown disease in a sea grape farm from Vietnam. Clear differences between healthy and diseased cases were observed at the order, genus, and Operational Taxonomic Unit (OTU) level. A richer diversity was detected in the diseased thalli of C. lentillifera , as well as the dominance of the orders Flavobacteriales (phylum Bacteroidetes) and Phycisphaerales (Planctomycetes). Aquibacter, Winogradskyella , and other OTUs of the family Flavobacteriaceae were hypothesized as detrimental bacteria, this family comprises some well‐known seaweed pathogens. Phycisphaera together with other Planctomycetes and Woeseia were probably saprophytes of C. lentillifera . The Rhodobacteraceae and Rhodovulum dominated the bacterial community composition of healthy C. lentillifera . The likely beneficial role of Bradyrhizobium, Paracoccus , and Brevundimonas strains on nutrient cycling and phytohormone production was discussed. The bleaching of diseased C. lentillifera might not only be associated with pathogens but also with an oxidative response. This study offers pioneering insights on the co‐occurrence of C. lentillifera ‐attached bacteria, potential detrimental or beneficial microbes, and a baseline for understanding the C. lentillifera holobiont. Further applied and basic research is urgently needed on C. lentillifera microbiome, shotgun metagenomic, metatranscriptomic, and metabolomic studies as well as bioactivity assays are recommended.
    Type of Medium: Online Resource
    ISSN: 2045-8827 , 2045-8827
    URL: Issue
    URL: Article
    DOI: 10.1002/mbo3.v10.6
    DOI: 10.1002/mbo3.1253
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2661368-2
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  • 2
    Online Resource
    Online Resource
    Dominance of Endozoicomonas bacteria throughout coral bleaching and mortality suggests structural inflexibility of the Pocillopora verrucosa microbiome
    Wiley ; 2018
    In:  Ecology and Evolution Vol. 8, No. 4 ( 2018-02), p. 2240-2252
    Details
    In: Ecology and Evolution, Wiley, Vol. 8, No. 4 ( 2018-02), p. 2240-2252
    Abstract: The importance of Symbiodinium algal endosymbionts and a diverse suite of bacteria for coral holobiont health and functioning are widely acknowledged. Yet, we know surprisingly little about microbial community dynamics and the stability of host‐microbe associations under adverse environmental conditions. To gain insight into the stability of coral host‐microbe associations and holobiont structure, we assessed changes in the community structure of Symbiodinium and bacteria associated with the coral Pocillopora verrucosa under excess organic nutrient conditions. Pocillopora ‐associated microbial communities were monitored over 14 days in two independent experiments. We assessed the effect of excess dissolved organic nitrogen ( DON ) and excess dissolved organic carbon ( DOC ). Exposure to excess nutrients rapidly affected coral health, resulting in two distinct stress phenotypes: coral bleaching under excess DOC and severe tissue sloughing ( 〉 90% tissue loss resulting in host mortality) under excess DON . These phenotypes were accompanied by structural changes in the Symbiodinium community. In contrast, the associated bacterial community remained remarkably stable and was dominated by two Endozoicomonas phylotypes, comprising on average 90% of 16S rRNA gene sequences. This dominance of Endozoicomonas even under conditions of coral bleaching and mortality suggests the bacterial community of P. verrucosa may be rather inflexible and thereby unable to respond or acclimatize to rapid changes in the environment, contrary to what was previously observed in other corals. In this light, our results suggest that coral holobionts might occupy structural landscapes ranging from a highly flexible to a rather inflexible composition with consequences for their ability to respond to environmental change.
    Type of Medium: Online Resource
    ISSN: 2045-7758 , 2045-7758
    URL: Issue
    URL: Article
    DOI: 10.1002/ece3.2018.8.issue-4
    DOI: 10.1002/ece3.3830
    Language: English
    Publisher: Wiley
    Publication Date: 2018
    detail.hit.zdb_id: 2635675-2
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  • 3
    Online Resource
    Online Resource
    Sugar enrichment provides evidence for a role of nitrogen fixation in coral bleaching
    Wiley ; 2017
    In:  Global Change Biology Vol. 23, No. 9 ( 2017-09), p. 3838-3848
    Details
    In: Global Change Biology, Wiley, Vol. 23, No. 9 ( 2017-09), p. 3838-3848
    Abstract: The disruption of the coral–algae symbiosis (coral bleaching) due to rising sea surface temperatures has become an unprecedented global threat to coral reefs. Despite decades of research, our ability to manage mass bleaching events remains hampered by an incomplete mechanistic understanding of the processes involved. In this study, we induced a coral bleaching phenotype in the absence of heat and light stress by adding sugars. The sugar addition resulted in coral symbiotic breakdown accompanied by a fourfold increase of coral‐associated microbial nitrogen fixation. Concomitantly, increased N:P ratios by the coral host and algal symbionts suggest excess availability of nitrogen and a disruption of the nitrogen limitation within the coral holobiont. As nitrogen fixation is similarly stimulated in ocean warming scenarios, here we propose a refined coral bleaching model integrating the cascading effects of stimulated microbial nitrogen fixation. This model highlights the putative role of nitrogen‐fixing microbes in coral holobiont functioning and breakdown.
    Type of Medium: Online Resource
    ISSN: 1354-1013 , 1365-2486
    URL: Issue
    URL: Article
    DOI: 10.1111/gcb.2017.23.issue-9
    DOI: 10.1111/gcb.13695
    Language: English
    Publisher: Wiley
    Publication Date: 2017
    detail.hit.zdb_id: 2020313-5
    SSG: 12
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