Assemblage of benthic diatoms and culturable heterotrophs in shallow-water hydrothermal vent of the D. Joao de Castro Seamount, Azores in the Atlantic Ocean

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dc.contributor.author Raghukumar, C.
dc.contributor.author Mohandass, C.
dc.contributor.author Cardigos, F.
dc.contributor.author DeCosta, P.M.
dc.contributor.author Santos, R.S.
dc.contributor.author Colaco, A.
dc.date.accessioned 2009-01-20T08:31:54Z
dc.date.available 2009-01-20T08:31:54Z
dc.date.issued 2008
dc.identifier.citation Current Science, Vol.95(12); 1715-1723
dc.identifier.uri http://drs.nio.org/drs/handle/2264/2114
dc.description.abstract The shallow-water hydrothermal vent of D. Joao de Castro Seamount in the North Atlantic, between the Azorean islands Sao Miguel and Terceira, is characterized by yellow and white zones which are distinct in physical and chemical characteristics. The white zone is characterized by high content of H sub(2)S, CH sub(4), H sub(2), Pb and Co, and temperature of approx. 37 degrees C. The yellow zone is characterized by high concentrations of Fe, Ba and Mn and temperature of approx. 60 degrees C. In this recently described vent site, we have studied species diversity of benthic diatoms and heterotrophic microorganisms and their metal tolerance. Species diversity of benthic diatoms was marginally higher in white than the yellow zone. A higher number of heterotrophic organisms were isolated from the yellow zone than the white zone. Most of the culturable heterotrophic bacterial isolates showed better growth in the presence of Fe, Mn and Pb than in their absence. Here we report the presence of culturable filamentous fungi and thraustochytrid protests from the shallow-water hydrothermal vent. Growth and protease production in one of the thraustochytrid cultures, were not affected by the addition of Fe, Mn and Pb to the culture medium. The presence of such metalresistant bacteria and thraustochytrids may suggest their adaptation to survive in metal-enriched waters of hydrothermal vents.
dc.language.iso en
dc.publisher Current Science Association, India
dc.rights Copyright [2008]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
dc.subject benthic diatoms
dc.subject hydrothermal vent
dc.subject Atlantic Ocean
dc.subject heterotrophic organisms
dc.title Assemblage of benthic diatoms and culturable heterotrophs in shallow-water hydrothermal vent of the D. Joao de Castro Seamount, Azores in the Atlantic Ocean
dc.type Journal Article


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