Algicidal bacteria isolated from the surface of seaweeds from the coast of Osaka Bay in the Seto Inland Sea, Japan

Imai, Ichiro; Fujimaru, Daisuke; Nishigaki, Tomokazu; Kurosaki, Morito; Sugita, Haruo

doi:10.2989/18142320609504170

Cited by 38 publications

(30 citation statements)

References 20 publications

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“…Principal component analysis identified 17 OTUs, in addition to the Endozoicomonas OTUs (OTU 69 and 71), which were responsible for driving the differences in microbial communities associated with the different samples. These other OTUs were related to members of the Rhodobacterales and Vibrionales, several members of which have previously been identified as putative pathogens, or associated with disease lesions of scleractinian corals and other marine invertebrates (Imai et al, 2006;Koren and Rosenberg, 2008;Becker et al, 2009;Sekar et al, 2009;Sunagawa et al, 2009;Case et al, 2011;Fernandes et al, 2011;Figure 3b). OTUs from these groups were also found to have a highly significant negative correlation to Endozoicomonas.…”

Section: Resultsmentioning

confidence: 90%

“…Of particular interest are OTU 25 and 51 which are closely related to known algal pathogens that cause bleaching and mortality of both macro-and microalgae (Imai et al, 2006;Case et al, 2011;Fernandes et al, 2011). Colonies of both the 'Back Reef' and 'Deep Slope' habitats at all locations were observed to be paler in colour than those of the 'Upper Slope' habitats (Supplementary Figure S2).…”

Section: Reef Environment Controls Coral Microbiome O Pantos Et Almentioning

confidence: 99%

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Habitat-specific environmental conditions primarily control the microbiomes of the coral Seriatopora hystrix

et al. 2015

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Reef-building corals form complex relationships with a range of microorganisms including bacteria, archaea, fungi and the unicellular microalgae of the genus Symbiodinium, which together form the coral holobiont. These symbionts are known to have both beneficial and deleterious effects on their coral host, but little is known about what the governing factors of these relationships are, or the interactions that exist between the different members of the holobiont and their environment. Here we used 16S ribosomal RNA gene amplicon sequencing to investigate how archaeal and bacterial communities associated with the widespread scleractinian coral Seriatopora hystrix are influenced by extrinsic (reef habitat and geographic location) and intrinsic (host genotype and Symbiodinium subclade) factors. Bacteria dominate the microbiome of S. hystrix, with members of the Alphaproteobacteria, Gammaproteobacteria and Bacteriodetes being the most predominant in all samples. The richness and evenness of these communities varied between reef habitats, but there was no significant difference between distinct coral host lineages or corals hosting distinct Symbiodinium subclades. The coral microbiomes correlated to reef habitat (depth) and geographic location, with a negative correlation between Alpha-and Gammaproteobacteria, driven by the key members of both groups (Rhodobacteraceae and Hahellaceae, respectively), which showed significant differences between location and depth. This study suggests that the control of microbial communities associated with the scleractinian coral S. hystrix is driven primarily by external environmental conditions rather than by those directly associated with the coral holobiont.

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Section: Resultsmentioning

confidence: 90%

Section: Reef Environment Controls Coral Microbiome O Pantos Et Almentioning

confidence: 99%

Habitat-specific environmental conditions primarily control the microbiomes of the coral Seriatopora hystrix

et al. 2015

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“…and seawater at the seaweed bed, and these strains were identifi ed on the basis of the analyses of 16S rDNA genes. These bacteria also belonged to gamma-proteobacteria and the phylum Bacteroides, and the strains belonging to alpha-proteobacteria were newly identifi ed (Imai et al 2006a ). Table 25.1 shows the prey range of algicidal bacteria isolated from the surface of seaweeds and seawater in the seaweed bed of Misaki-kouen of Osaka Bay in 1999 (Imai et al 2006a ).…”

Section: Seaweed Beds As Prevention Strategies For Red Tidesmentioning

confidence: 99%

“…These bacteria also belonged to gamma-proteobacteria and the phylum Bacteroides, and the strains belonging to alpha-proteobacteria were newly identifi ed (Imai et al 2006a ). Table 25.1 shows the prey range of algicidal bacteria isolated from the surface of seaweeds and seawater in the seaweed bed of Misaki-kouen of Osaka Bay in 1999 (Imai et al 2006a ). The dinofl agellate K. mikimotoi was the most susceptible species, followed by the raphidophyte F. japonica , H. akashiwo (IWA) and C. ovata .…”

Section: Seaweed Beds As Prevention Strategies For Red Tidesmentioning

confidence: 99%

Interactions Between Harmful Algae and Algicidal and Growth-Inhibiting Bacteria Associated with Seaweeds and Seagrasses

Imai

2015

Marine Protists

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Phytoplankton and bacteria are the main components of marine ecosystems and hence comprise abundant numbers and biomass in the sea. There exist close and diverse interactions between phytoplankton and bacteria in marine ecosystems. Among these relationships, bacteria possessing algicidal and growthinhibiting activities against phytoplankton have been increasingly gathering attention and are expected to control phytoplankton dynamics especially harmful algal blooms in coastal environments. Algicidal activities are divided into two types, i.e., the direct attack type, needing direct attachment to host algal cells, and the indirect attack type, producing algicidal matter. Some bacteria kill part of algal populations, and they are growth-inhibiting bacteria. In harmful algal blooms (HABs) of such as the raphidophytes Heterosigma akashiwo and Chattonella spp., bacteria play an important role in the bloom terminations. Most algicidal bacteria are particle-associated forms in coastal seas. A new fi nding is that huge numbers of algicidal bacteria against HAB species (dinofl agellates and raphidophytes) were attached to the surface of seaweeds such as the green alga Ulva pertusa, the red alga Gelidium spp. and the brown algae Sargassum muticum and S. thunbergii . The densities of these algicidal bacteria reached as many as 10 6 g −1 wet weight. Further, algicidal bacteria were found in the biofi lm of the seagrass Zostera marina with high densities of 10 7 g −1 wet blade or more. In the case of the toxic dinofl agellate Alexandrium tamarense , growth-inhibiting bacteria with strong activities were isolated from the blade of Z. marina . In developed countries, seagrass-and seaweed beds have been lost by reclamation for increasing land of commercial uses. We here propose restoration of seagrass-and seaweed beds, not only for increasing the nursery grounds of various marine lives but also for creating preventative strategies for HAB occurrences. This is a kind of activity in conformity with the Sato-Umi concept recently proposed.

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“…R11, a variety of virulence factors were found including quorum sensing genes (Fernandes et al 2011). Several studies have shown members of the Roseobacter clade to be algacidal and opportunistically pathogenic (Amaro et al 2005;Imai et al 2006;Seyedsayamdost et al 2011). …”

Section: Discussionmentioning

confidence: 99%

Investigating the Driving Mechanisms Behind Differences in Bleaching and Disease Susceptibility Between Two Scleractinian Corals, Pseudodiploria Strigosa and Diploria Labyrinthiformis

Pratte¹

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Algicidal bacteria isolated from the surface of seaweeds from the coast of Osaka Bay in the Seto Inland Sea, Japan

Cited by 38 publications

References 20 publications

Habitat-specific environmental conditions primarily control the microbiomes of the coral Seriatopora hystrix

Habitat-specific environmental conditions primarily control the microbiomes of the coral Seriatopora hystrix

Interactions Between Harmful Algae and Algicidal and Growth-Inhibiting Bacteria Associated with Seaweeds and Seagrasses

Investigating the Driving Mechanisms Behind Differences in Bleaching and Disease Susceptibility Between Two Scleractinian Corals, Pseudodiploria Strigosa and Diploria Labyrinthiformis

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