Indian Journal of Geo-Marine Sciences

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Published by: NISCAIR (CSIR)

Subjects: Earth Science Geo-Marine Science

This journal was started in 1972 and this multi-disciplinary journal publishes full papers and short communications in the following areas: marine biology, marine chemistry, marine geology, physical oceanography, ocean engineering, marine instrumentation, marine corrosion and material science, satellite oceanography & modeling, marine engineering, marine pollution, marine archaeology, coastal zone management.

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Editor, IJGMS, National Institute of Science Communication And Information Resources, CSIR, K S Krishnan Marg, Pusa Campus, New Delhi 110 012, India Phone:25846301,03-07 (Extn-248); Fax:(91)(11) 25847062 E-mail: sundaresanj@hotmail.com


ISSN No. :    0379-5136
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Assessment of mercury pollution through mercury resistant marine bacteria in Bhitarkanika mangrove ecosystem, Odisha, India
Title: Assessment of mercury pollution through mercury resistant marine bacteria in Bhitarkanika mangrove ecosystem, Odisha, India

Authors: Dash, Hirak Ranjan; Das, Surajit

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): 1103-1115

Mercury exposure Aasessment in fish and humans from Sundarban Mangrove Wetland of India
Title: Mercury exposure Aasessment in fish and humans from Sundarban Mangrove Wetland of India

Authors: Chatterjee, M.; Basu, N.; Sarkar, S. K.

Abstract: Present study had documented total mercury levels in six commonly consumed fish species, and performed a cross-sectional study on local residents to gauge their intake of fish (via dietary survey) and mercury exposure (via hair biomarker analyses). Mean total mercury content in edible composites of locally-caught fishes (topse, hilsa, mackerel, topse, sardinella, khoira) was low and ranged from 0.01 to 0.11 μg g-1 mercury, dry weight. In a cross-sectional study of 58 area residents, the mercury content in hair ranged from 0.25 to 1.23 μg g-1, with a mean of 0.65 ± 0.23 μg g-1. Hair mercury level was not influenced by gender, age, or occupation. Mean number of meals consumed per week was 3.1 ± 1.1, and all participants consumed at least one fish meal per week. When related to fish consumption, a significant positive association was found between number of fish meals consumed per week and hair mercury levels.

Page(s): 1095-1101

Sedimentary geochemistry of Chorao Island, Mandovi mangrove estuarine complex, Goa
Title: Sedimentary geochemistry of Chorao Island, Mandovi mangrove estuarine complex, Goa

Authors: Sappal, Swati M.; Ramanathan, AL.; Ranjan, Rajesh K.; Singh, Gurmeet

Abstract: Present study highlighted significant anthropogenic contributions in terms of heavy metal pollution in Mandovi estuarine complex. Sediment core was collected which was analyzed for different physico-chemical parameters. Sediments were found to be mature, quartz rich and weathering does not seem to play any role. Biological activities were significant due to abundance of S and OC in the sediments which along with the redox conditions controlled the metal variability. Sediments were found to be enriched with respect to heavy metals like Pb and Mn indicating anthropogenic influence in this region.

Page(s): 1085-1094

Patterns of seasonal variability in granulometric characteristics of Bhitarkanika Mangrove – estuarine complex, East coast of India
Title: Patterns of seasonal variability in granulometric characteristics of Bhitarkanika Mangrove – estuarine complex, East coast of India

Authors: Chauhan, Rita; Ramanathan, A. L.; Adhya, T. K.

Abstract: Textural attributes of recent sediments measured in terms of mean (Mz), Standard deviation (σ1), Skewness (Sk1) and Kurtosis (KG) are widely used to reconstruct the depositional environments of sediments. Sediments were collected in three seasons from different areas of Bhitarkanika mangrove estuary to investigate the spatial and seasonal variability and influence of sediment transport on grain size characteristics. A marked variation in granulometric parameters was observed with respect to its geomorphic location in different seasons. Most of sediments were dominated by fine to very fine grain size, which are poorly sorted throughout the year. These poorly sorted, positively skewed fine grained sand indicate depositional process in a low energy environment. Linear discriminant function (LDF) showed aeolian process for mixed up sediment causing poor sorting of the sediments during all seasons.

Page(s): 1077-1084

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