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Disentangling the influence of environment, host specificity and thallus differentiation on bacteria communities in siphonous green seaweeds
Morrissey, K.L.; Çavas, L.; Willems, A.; De Clerck, O. (2019). Disentangling the influence of environment, host specificity and thallus differentiation on bacteria communities in siphonous green seaweeds. Front. Microbiol. 10: 717. https://dx.doi.org/10.3389/fmicb.2019.00717
In: Frontiers in Microbiology. Frontiers Media: Lausanne. ISSN 1664-302X; e-ISSN 1664-302X, meer
Peer reviewed article  

Beschikbaar in  Auteurs 

Trefwoorden
    Caulerpa J.V. Lamouroux, 1809 [WoRMS]
    Marien/Kust
Author keywords
    Caulerpa; microbiome; bacterial variation; host specificity;morphological niche

Auteurs  Top 
  • Morrissey, K.L., meer
  • Çavas, L.
  • Willems, A., meer
  • De Clerck, O., meer

Abstract
    Siphonous green seaweeds, such as Caulerpa, are among the most morphologically complex algae with differentiated algal structures (morphological niches). Caulerpa is also host to a rich diversity of bacterial endo- and epibionts. The degree to which these bacterial communities are species-, or even niche-specific remains largely unknown. To address this, we investigated the diversity of bacteria associated to different morphological niches of both native and invasive species of Caulerpa from different geographic locations along the Turkish coastline of the Aegean sea. Associated bacteria were identified using the 16S rDNA marker gene for three morphological niches, such as the endobiome, epibiome, and rhizobiome. Bacterial community structure was explored and deterministic factors behind bacterial variation were investigated. Of the total variation, only 21.5% could be explained. Pronounced differences in bacterial community composition were observed and variation was partly explained by a combination of host species, biogeography and nutrient levels. The majority of the explained bacterial variation within the algal holobiont was attributed to the micro-environments established by distinct morphological niches. This study further supports the hypothesis that the bacterial assembly is largely stochastic in nature and bacterial community structure is most likely linked to functional genes rather than taxonomy.

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