Diatom Biofilms: Ecosystem Engineering and Niche Construction

Paterson, David M.; Hope, Julie A.

doi:10.1002/9781119526483.ch6

Cited by 3 publications

(2 citation statements)

References 119 publications

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“…Bacteria are considered as one of the main factors that could promote the growth of diatoms and the secretion of extracellular polymeric substances (EPS) in biofilms. The latter are the dominant components in the diatom-biofilm [ 6 , 7 ]. In addition, earlier studies reported that the growth of algae depended on bacteria or bacterial enzymes, and algae synthesized necessary substances such as vitamin B12 via these enzymes [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Revealing the Bacterial Quorum-Sensing Effect on the Biofilm Formation of Diatom Cylindrotheca sp. Using Multimodal Imaging

et al. 2023

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Diatoms contribute to carbon fixation in the oceans by photosynthesis and always form biofouling organized by extracellular polymeric substances (EPS) in the marine environment. Bacteria-produced quorum-sensing signal molecules N-acyl homoserine lactones (AHLs) were found to play an important role in the development of Cylindrotheca sp. in previous studies, but the EPS composition change was unclear. This study used the technology of alcian blue staining and scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM), and time-of-flight secondary ion mass spectrometry (ToF-SIMS) to directly observe the biofilm formation process. The results showed that AHLs promote the growth rates of diatoms and the EPS secretion of biofilm components. AHLs facilitated the diatom-biofilm formation by a forming process dependent on the length of carbon chains. AHLs increased the biofilm thickness and the fluorescence intensity and then altered the three-dimensional (3D) structures of the diatom-biofilm. In addition, the enhanced EPS content in the diatom-biofilm testified that AHLs aided biofilm formation. This study provides a collection of new experimental evidence of the interaction between bacteria and microalgae in fouling biofilms.

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Section: Introductionmentioning

confidence: 99%

Revealing the Bacterial Quorum-Sensing Effect on the Biofilm Formation of Diatom Cylindrotheca sp. Using Multimodal Imaging

et al. 2023

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“…The ecological functions of intertidal sediments are partly due to the rich microbial communities (i.e, microphytobenthos (MPB) mainly comprising epipelic diatoms, and prokaryotes mainly composed of bacteria) that inhabit in the permeable bottom sediments (Underwood and Paterson, 1993;Orvain et al, 2014;Paterson and Hope, 2021). The pore volume in the sedimentary bed provides high diversity of niches and supports a rich community of benthic microbial communities (Hunter et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Biophysical contexture of coastal biofilm-sediments varies heterogeneously and seasonally at the centimeter scale across the bed-water interface

Chen

Kang²,

Zhang³

et al. 2023

Front. Mar. Sci.

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Coastal sediments filter and accumulate organic and inorganic materials from the terrestrial and marine environment, and thus provide a high diversity of microbial niches. However, sediment-based analyses typically examine bulk samples and seldom consider variation at a scale relevant to changes in environmental conditions, due to the lack of mid-long term field data which can cover both the seasonal and sediment depth variations. In this study, microbial production and bacterial community structure were determined together with grain parameters over 10 months of intertidal silty sands on Jiangsu Coast, China. We demonstrated that the microbiological effects did not merely present on the surface, but greatly varied and stratified in both physical and biological contexture within the top 4 cm layer. Bacterial community structure showed a clear vertical variation with higher operational taxonomic unit (OTU) numbers at 1~2 cm depth than in the top 2 mm, probably because of the decreasing disturbance by hydrodynamic forces. However, the microbial production rates and metabolic activities, represented by the production of extracellular polymeric substances (EPS), were always higher in the top. Seasonal changes were strongly reflected in the vertical patterns of EPS but could not explain the variation across sites. The overall EPS secretion in spring and summer was generally at high level than that in autumn and winter, with the maximum value of 5~6 times higher. Interestingly, the stratification of biological and physical properties followed a fixed relationship, where with the decrease of the grain size D50, the EPS content increased exponentially, and this relationship was independent of temporal or spatial variation. Despite the significant seasonal variation of microbial activity and sedimentary grain size individually, the basic function between EPS content and D50 however did not alter. Filling these knowledge gaps will not only help to decipher the fate of grain-biofilm aggregates and organic matter burial under global changes, but also provide field evidence for the development of sediment transport models as well as blue carbon models incorporating microbial processes.

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Extracellular Polymeric Substance Production by Benthic Pennate Diatoms

Underwood

2024

Diatom Photosynthesis

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Diatom Biofilms: Ecosystem Engineering and Niche Construction

Cited by 3 publications

References 119 publications

Revealing the Bacterial Quorum-Sensing Effect on the Biofilm Formation of Diatom Cylindrotheca sp. Using Multimodal Imaging

Revealing the Bacterial Quorum-Sensing Effect on the Biofilm Formation of Diatom Cylindrotheca sp. Using Multimodal Imaging

Biophysical contexture of coastal biofilm-sediments varies heterogeneously and seasonally at the centimeter scale across the bed-water interface

Extracellular Polymeric Substance Production by Benthic Pennate Diatoms

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