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Title: Assessment of mercury pollution through mercury resistant marine bacteria in Bhitarkanika mangrove ecosystem, Odisha, India
Authors: Dash, Hirak Ranjan
Das, Surajit
Keywords: Mercury resistant bacteria;Mangrove;merA;Bhitarkanika mangrove ecosystem;Mercury pollution
Issue Date: Jun-2014
Publisher: NISCAIR-CSIR, India
Abstract: Level of mercury pollution by estimating the number of mercury resistant marine bacteria is examined in this study. Total mercury levels in the water and sediment samples were estimated between 0.14 and 0.66 ppb (0.00014 and 0.00066 ppm) and from 0.23 to 0.97 ppb (0.00023 to 0.00097 ppm) respectively. pH, temperature and salinity level of the water samples were in the range of 7.13-7.16, 27.35-36.1ºC and 14.25-15.6 ppt respectively during this period. Mercury resistant marine bacteria followed the trend of mercury level and ranged from 2.60×103 to 7.05×104 CFU/mL and from 0.16×103 to 7.4×104 CFU/g in water and sediment respectively. Percentage of mercury resistant bacteria varied from 0.12 to 89.28 in water and 0.14 to 88.88 in sediment. Some of the resistant isolates (positive for mer operon mediated mercury resistance) were characterized further. They were found to be under the genera Vibrio and Bacillus which can resist other toxic metals (Cd, Zn, Pb, As) as well as antibiotics (AM, VA, NX, AZM, A, AC) confirming the pollution level in the ecosystem.
Page(s): 1109-1121
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.43(06) [June 2014]

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