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Retrieved bacteria from Noctiluca miliaris (green) bloom of the northeastern Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title Retrieved bacteria from Noctiluca miliaris (green) bloom of the northeastern Arabian Sea
 
Creator Basu, S.
Matondkar, S.G.P.
Furtado, I.
 
Subject bacteria
algal blooms
Noctiluca miliaris
Bacillus
 
Description In recent years, seasonal blooms of the dinoflagellate Noctiluca miliaris have appeared in the open-waters of the northern Arabian Sea (NAS). This study provides the first characterization of bacteria from a seasonal bloom of green Noctiluca of NAS (20 degrees N - 17 degrees N and 64 degrees E - 70 degrees E), during the spring-inter-monsoon cruise of Sagar Sampada 253, in March 2007. Bacterial growth as assessed by most-probable number (MPN) and plate counts, revealed 'variable-physiotypes' over a wide range of salinities (0 percent to 25 percent w/v NaCl), pH levels (5-8.5), and organic nutrient strengths, in comparison to non-bloom waters. MPN indices of bacteria in surface waters of bloom stations DWK and PRB, corresponded to (3.08-4.41)?10 sup(3) cells/mL at 3.5 percent NaCl (w/v), and (2.82-9.49)?10 sup(2) cells/mL at 25 percent (w/v) NaCl in tryptone-yeast extract broth (TYE). Plate counts were (1.12-4)?10 sup(6) CFU/mL at 0 percent (w/v) NaCl, (1.28-3.9)?10 sup(6) CFU/mL at 3.5 percent (w/v) NaCl, and (0.4-7)?10 sup(4) CFU/mL at 25 percent NaCl (w/v) on TYE. One-tenth-strength Zobell's gave (0.6-3.74)?10 sup(5) CFU/mL at pH 5 to (3.58-7.5)?10 sup(5) CFU/mL at pH 8.5. These bacteria were identified to the genera Bacillus, Cellulomonas, Staphylococcus, Planococcus, Dietzia, Virgibacillus, Micrococcus, Sporosarcinae, Leucobacter, and Halomonas. The identity of three strains (GUFBSS253N2, GUFBSS253N30, and GUFBSS253N84) was confirmed through 16S rDNA sequence homology as Bacillus cohnii, Bacillus flexus, and Bacillus cereus. The approx. 2-3 fold higher plate counts of culturable bacteria from the open-waters of the NAS indicate that these bacteria could critically determine the biogeochemical dynamics of the bloom and its milieu. The role of these bacteria in sustaining/terminating the bloom is under evaluation.
 
Date 2013-03-05T07:28:50Z
2013-03-05T07:28:50Z
2013
 
Type Journal Article
 
Identifier Chinese Journal of Oceanology and Limnology, vol.31(1); 2013; 10-20
http://drs.nio.org/drs/handle/2264/4254
 
Language en
 
Rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2012] Springer.
 
Publisher Chinese Society for Oceanology and Limnology