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An insight to the microbiota in the trophosome of the cold seep tubeworm, Lamellibrachia sp. from the Cauvery-Mannar basin
  • Akshay Unnikrishnan,
  • Narsinh L. Thakur,
  • Aninda Mazumdar
Akshay Unnikrishnan
Academy of Scientific and Innovative Research
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Narsinh L. Thakur
Academy of Scientific and Innovative Research

Corresponding Author:[email protected]

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Aninda Mazumdar
Academy of Scientific and Innovative Research
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Abstract

Cold seeps are unique ecosystem deep in the ocean, driven by the chemosynthetic based benthic communities. One of the unique organisms found in this ecosystem is the polychaete annelid tubeworm belonging to the Siboglinidae family. This organism depends on sulfur oxidising endosymbionts that are housed in the bacteriocytes for its nutrition. However, little information is available on the complete microbiota present in the trophosome. The detailed investigation was carried out by employing a 16S rDNA based metagenomic analysis of the trophosome from the tubeworm collected from the Mannar basin pockmark area in the Indian Ocean. Despite being dominated by sulfur oxidizing bacteria, there was a high percentage of OTUs belonging to Pseudomonales and Bacteroidales. These bacteria may be involved in the metabolism of methane and complex polymers which aids in the nutrition of the tubeworm and requires further investigation with regards to their role. The sulfur oxidizing bacteria showed more than 99% identity with symbiont sequences of Escarpia sp and other Lamellibrachia sp from the Western Mediterranean Sea and Gulf of Mexico respectively. This data constitutes the first report on the bacterial community present in the trophosome of the cold seep tubeworm Lamellibrachia sp from the pockmark of Mannar basin.