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Local ciliate communities associated with aquatic macrophytes.

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    Ciliate communities on aquatic plants varied, with no single plant species hosting a unique ciliate assemblage. Plant traits, like biofilm presence, influence ciliate abundance and diversity in river ecosystems.

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    Area of Science:

    • Ecology
    • Freshwater Biology
    • Protozoology

    Background:

    • Chalk streams are vital freshwater ecosystems.
    • Aquatic macrophytes provide habitats for diverse microbial communities.
    • Ciliated protozoa play key roles in aquatic food webs.

    Purpose of the Study:

    • To compare ciliated protozoan communities associated with three common lotic macrophyte species.
    • To investigate the influence of macrophyte species on ciliate abundance and diversity.
    • To explore factors affecting ciliate community structure on aquatic plants.

    Main Methods:

    • Sampling within the River Frome catchment, England.
    • Identification and enumeration of ciliated protozoa on Ranunculus penicillatus subsp. pseudofluitans, Nasturtium officinale, and Sparganium emersum.
    • Analysis of ciliate abundance, species richness, and community composition in relation to macrophyte species.

    Main Results:

    • A total of 77 ciliate species were identified.
    • No plant species hosted a unique ciliate assemblage.
    • Ciliate abundance and species richness varied significantly among plant species.
    • Ranunculus penicillatus subsp. pseudofluitans supported the most consistent and species-rich communities.
    • Nasturtium officinale exhibited low ciliate abundance and reduced biofilm, potentially due to phenethyl isothiocyanate production.
    • Sparganium emersum communities were unstable.

    Conclusions:

    • Macrophyte traits, including morphology, decay patterns, and defense mechanisms, significantly influence biofilm quantity and quality.
    • Biofilm characteristics are key determinants of ciliate community structure and abundance on aquatic plants.
    • Plant species-specific chemical defenses, like those in Nasturtium officinale, can suppress microbial growth and associated ciliate communities.