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Chemical defense in ascidians Eudistoma viride and Didemnum psammathodes in Tuticorin, southeast coast of India: Bacterial epibiosis and fouling deterrent activity



Chemical defense in ascidians Eudistoma viride and Didemnum psammathodes in Tuticorin, southeast coast of India: Bacterial epibiosis and fouling deterrent activity



Indian Journal of Marine Sciences 32(4): 337-339



The culturable epibacterial abundance in the ascidians Eudistoma viride and Didemnum psammathodes was studied and correlated with their antifouling activity. The epibacterial abundance varied significantly between E. viride and D. psammathodes. The antibacterial assay of the crude extracts of the ascidians showed inhibitory activity against all the 20 biofilm bacteria. However, E. viride showed prominent antibacterial activity than that of D. psammathodes with an average inhibition zone of 29.1 mm. The comparison between epibacterial abundance and the antifouling activity showed an interesting significant negative correlation (-0.910 (P<0.001)). Though the ascidians showed activity against all biofilm bacteria, the presence of epibacteria still on its surface could be attributed to their selective inhibition against certain bacteria due to chemical defense mechanism or the ascidians may exhibit a surface property suitable for particular epibacteria which may be symbiotic and contribute to the reduced abundance of other bacterial epibionts.

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