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    Gregarious true- colonies of ciliate Vorticella oceanica on a chain forming diatom Chaetoceros coarctatus: indicating change in the nature of association

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    Date
    2019
    Author
    Nanajkar, M.
    Fernandes, V.
    Bogati, K.
    Chatterjee, T.
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    Abstract
    Eco-commensal association between the chain forming planktonic diatom Chaetoceros coarctatus and the peritrich aloricate ciliate Vorticella oceanica is well known in tropical waters. This epibiosis provides several advantages to the epibiont V. oceanica, and includes protection, buoyancy, drift, supply of resources and possible assistance in reproduction. While it is a well-established fact that the host usually remains neutrally affected, without any gain or loss due to the attached epibiont, in the present study, the host showed signs of negative impact due to overgrowth of the epibiont. The present study noted for the first time a gregarious stage of V. oceanica �true colony� from the coastal waters off the central west coast of India. The true-colonies of V. oceanica impacted the C. coarctatus chains as V. oceanica swarmed with high density and disintegrated the host setae. This study discusses all the stages of attachment of this species- specific consortium, along an estuarine gradient, and its possible ecological implications.
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    https://doi.org/10.1007/s13199-019-00640-4
    http://drs.nio.org/drs/handle/2264/8204
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