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  • 1
    Online Resource
    Online Resource
    Unterscheiden sich Makroalgen in ihren bakteriellen Aufwuchsgemeinschaften? (2005)
    Kiel
    Details Availability
    Keywords: Hochschulschrift ; Seetang ; Aufwuchs
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (84 Seiten = 8 MB) , Illustrationen, Graphen
    Edition: 2021
    URL: https://oceanrep.geomar.de/6129/
    Language: German
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  • 2
    Online Resource
    Online Resource
    Isolated thallus-associated compounds from the macroalga Fucus vesiculosus mediate bacterial surface colonization in the field similar to that on the natural alga (2009)
    Associated volumes
    Details Availability
    In: Biofouling, London [u.a.] : Taylor & Francis, 1988, 26(2010), 3, Seite 247-255, 1029-2454
    In: volume:26
    In: year:2010
    In: number:3
    In: pages:247-255
    Description / Table of Contents: This study investigated whether surface-associated compounds isolated from the macroalga Fucus vesiculosus had the potential to mediate microbial and/or macrobial epibiosis similar to that on the natural alga. To selectively yield thallus-associated compounds and avoid contamination by intracellular algal compounds, cell lysis was monitored by surface microscopy of algal cells and chemical profiling of algal surface extracts by coupled gas chromatography mass spectroscopy. The optimized extraction resulted in polar and non-polar algal surface extracts. The non-polar surface extract was immobilized in hydrogel, the polar surface extract was homogeneously perfused through the gel to ensure a temporally constant delivery of polar extract components. During a 7 day field trial, bacterial biofilms were formed on control gels and gels featuring polar and/or non-polar extract components. PERMANOVA revealed that bacterial community profiles on controls and on gels featuring polar or non-polar extract were significantly different from the profile on F. vesiculosus, while the profile on the gels bearing both polar and non-polar extracts was not. Moreover, the polar surface extracts inhibited the settlement of barnacle cyprids. Considering the pronounced effects of bacterial biofilms on invertebrate larval settlement, these results suggest that algal surface chemistry affects macrofouling not only directly but also indirectly, via its control of biofilm formation and composition.
    Type of Medium: Online Resource
    Pages: Ill., graph. Darst
    ISSN: 1029-2454
    URL: http://www.informaworld.com/smpp/content~db=all~content=a918225841~frm=abslink
    DOI: 10.1080/08927010903474189
    Language: English
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  • 3
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    Metaorganisms in extreme environments: do microbes play a role in organismal adaptation? (2018)
    Elsevier
    In:  Zoology, 127 . pp. 1-19.
    Details
    Publication Date: 2021-02-08
    Description: From protists to humans, all animals and plants are inhabited by microbial organisms. There is an increasing appreciation that these resident microbes influence the fitness of their plant and animal hosts, ultimately forming a metaorganism consisting of a uni- or multicellular host and a community of associated microorganisms. Research on host–microbe interactions has become an emerging cross-disciplinary field. In both vertebrates and invertebrates a complex microbiome confers immunological, metabolic and behavioural benefits; conversely, its disturbance can contribute to the development of disease states. However, the molecular and cellular mechanisms controlling the interactions within a metaorganism are poorly understood and many key interactions between the associated organisms remain unknown. In this perspective article, we outline some of the issues in interspecies interactions and in particular address the question of how metaorganisms react and adapt to inputs from extreme environments such as deserts, the intertidal zone, oligothrophic seas, and hydrothermal vents
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.zool.2018.02.004
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Compounds associated with algal surfaces mediate epiphytic colonization of the marine macroalga Fucus vesiculosus (2013)
    Oxford University Press
    In:  FEMS Microbiology Ecology, 84 (2). pp. 411-420.
    Details
    Publication Date: 2017-01-05
    Description: The macroalga Fucus vesiculosus carries a specific community of surface bacteria. To identify chemical compounds that possibly mediate abundance and community composition of algae-associated bacteria, we tested the effect of surface-available algal compounds on bacterial settlement and community composition under field conditions. Compounds on algal thalli were separated from the surface by extraction with organic solvents and investigated on growth inhibition and settlement of bacterial isolates. Based on in vitro data, partially purified extract fractions were then exposed to bacterial colonizers in vivo followed by bacterial enumeration and community analysis. The polar fraction of the algal surface extract revealed a significant profouling effect for Vibrionales, whereas the nonpolar fraction containing the xanthophyll pigment fucoxanthin and other unidentified nonpolar surface compounds revealed a significant 80% reduction of surface colonizing bacteria. The analysis of bacterial surface communities by 454 pyrosequencing demonstrated that the antifouling activity of nonpolar algal surface compounds was targeting the abundance of natural bacterial colonizers rather than the relative composition of bacterial members within the community. Moreover, the bacterial community composition on F.vesiculosus was markedly different from artificial control substrates and chemically manipulated experimental treatments, suggesting that other, nonextractable surface features and/or physical properties render algal-specific epiphytic bacterial communities.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/1574-6941.12071
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  • 5
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    Fluorescence-Based Quasicontinuous and In Situ Monitoring of Biofilm Formation Dynamics in Natural Marine Environments (2014)
    American Society for Microbiology
    In:  Applied and Environmental Microbiology, 80 (12). pp. 3721-3728.
    Details
    Publication Date: 2019-09-23
    Description: Analyzing the dynamics of biofilm formation helps to deepen our understanding of surface colonization in natural environments. While methods for screening biofilm formation in the laboratory are well established, studies in marine environments have so far been based upon destructive analysis of individual samples and provide only discontinuous snapshots of biofilm establishment. In order to explore the development of biofilm over time and under various biotic and abiotic conditions, we applied a recently developed optical biofilm sensor to quasicontinuously analyze marine biofilm dynamics in situ. Using this technique in combination with microscope-assisted imaging, we investigated biofilm formation from its beginning to mature multispecies biofilms. In contrast to laboratory studies on biofilm formation, a smooth transition from initial attachment to colony formation and exponential growth could not be observed in the marine environment. Instead, initial attachment was followed by an adaptation phase of low growth and homogeneously distributed solitary bacterial cells. Moreover, we observed a diurnal variation of biofilm signal intensity, suggesting a transient state of biofilm formation of bacteria. Overall, the biofilm formation dynamics could be modeled by three consecutive development stages attributed to initial bacterial attachment, bacterial growth, and attachment and growth of unicellular eukaryotic microorganisms. Additional experiments showed that the presence of seaweed considerably shortened the adaptation phase in comparison with that on control surfaces but yielded similar growth rates. The outlined examples highlight the advantages of a quasicontinuous in situ detection that enabled, for the first time, the exploration of the initial attachment phase and the diurnal variation during biofilm formation in natural ecosystems
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1128/AEM.00298-14
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Ecology of antifouling resistance in the bladder wrack Fucus vesiculosus: patterns of microfouling and antimicrobial protection (2010)
    Inter Research
    In:  Marine Ecology Progress Series, 411 . pp. 33-48.
    Details
    Publication Date: 2018-06-14
    Description: The impact of moderate environmental stress may be modulated by stress-induced shifts of biotic interactions such as host – epibiont relationships. We studied the stress regime in shallow Western Baltic habitats, the variability of fouling at different temporal and spatial scales, and whether common stressors - low light, high temperature, grazing – affect the abundance and composition of the biofilm on a regionally important macroalga, the bladder wrack Fucus vesiculosus. We further explore the alga’s capacity to chemically modulate the recruitment of microfoulers and whether this ability is impacted by stress. In laboratory, mesocosm and field experiments fouling pressure and epibiotic cover on the algae varied strongly with changing environmental conditions such as temperature, irradiance, depth or grazing. The expectation that abiotic stress affects the fouling-modulating ability of the alga and, thus, indirectly produces the observed variability of epibiosis was not generally confirmed. Indeed, while the strength of chemical antifouling resistance varied seasonally, with a maximum in winter/spring and a minimum in late summer, this could not be related to temporal patterns of environmental stress, fouling pressure, or growth of Fucus. Only the seasonal variation in reproduction seemed to be in phase with antifouling activity. Controlled experiments confirmed that resistance strength was not affected by temperature or grazing, and only moderately by light. We conclude that the fouling modulation ability of Fucus vesiculosus may suffer from light-reduction (e.g. by eutrophication effects) while they are not sensitive to the predicted warming or enhanced grazing.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.3354/meps08644
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Blue-light-activated diurnal defense in /Fucus vesiculosus/ (2007)
    In:  [Talk] In: 42. European Marine Biology Symposium (EMBS), 30.08.2007, Kiel, Germany .
    Details
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 8
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    Specific bacterial biofilms on macroalgae: phylogeny matters more than habitat (2006)
    In:  [Other] In: 13. International Congress on Marine Corrosion and Biofouling, 27.07, Rio de Janeiro, Brazil .
    Details
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 9
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    rRNA-based profiling of bacteria in the axilla of healthy males suggests right-left asymmetry in bacterial activity (2011)
    Oxford University Press
    In:  FEMS Microbiology Ecology, 77 (1). pp. 146-153.
    Details
    Publication Date: 2017-01-05
    Description: The activity of the human armpit microbiota triggers the formation of body odor. We used differential 16S rRNA gene (rDNA)- and rRNA-based terminal-restriction fragment length polymorphism fingerprinting in combination with cloning and sequencing to identify active members of the human armpit microbiota. DNA and RNA were isolated from skin scrub samples taken from both armpits of 10 preconditioned, healthy males. The fingerprint profiles indicated pronounced similarities between the armpit microbiota in the right and the left axillae of an individual test person, but larger differences between the axilla microbiota of different individuals. Using 16S rDNA and rRNA sequence data, the majority of peaks in the armpit profiles were assigned to bacteria affiliated with well-known genera of skin bacteria. The relative abundances of all groups were similar among the rDNA and rRNA samples, suggesting that all groups of armpit bacteria were active. Surprisingly, the relative abundance of sequences affiliated with Peptoniphilus sp. was by far and with statistical significance the highest in the rRNA samples of the right armpits. Thus, bacteria affiliated with Peptoniphilus sp. might have been particularly active in the right axillae of the test persons, possibly owing to the handedness of the test persons, which might cause different environmental conditions in the right axillae.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/j.1574-6941.2011.01097.x
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  • 10
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    Epibacterial community patterns on marine macroalgae are host-specific but temporally variable (2011)
    Wiley
    In:  Environmental Microbiology, 13 (3). pp. 655-665.
    Details
    Publication Date: 2019-09-23
    Description: Marine macroalgae are constantly exposed to epibacterial colonizers. The epiphytic bacterial patterns and their temporal and spatial variability on host algae are poorly understood. To investigate the interaction between marine macroalgae and epiphytic bacteria, this study tested if the composition of epibacterial communities on different macroalgae was specific and persisted under varying biotic and abiotic environmental conditions over a 2-year observation time frame. Epibacterial communities on the co-occurring macroalgae Fucus vesiculosus, Gracilaria vermiculophylla and Ulva intestinalis were repeatedly sampled in summer and winter of 2007 and 2008. The epibacterial community composition was analysed by denaturing gradient gel electrophoresis (DGGE) and 16S rRNA gene libraries. Epibacterial community profiles did not only differ significantly at each sampling interval among algal species, but also showed consistent seasonal differences on each algal species at a bacterial phylum level. These compositional patterns re-occurred at the same season of two consecutive years. Within replicates of the same algal species, the composition of bacterial phyla was subject to shifts at the bacterial species level, both within the same season but at different years and between different seasons. However, 7–16% of sequences were identified as species specific to the host alga. These findings demonstrate that marine macroalgae harbour species-specific and temporally adapted epiphytic bacterial biofilms on their surfaces. Since several algal host-specific bacteria were highly similar to other bacteria known to either avoid subsequent colonization by eukaryotic larvae or to exhibit potent antibacterial activities, algal host-specific bacterial associations are expected to play an important role for marine macroalgae.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/j.1462-2920.2010.02371.x
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