Abstract
Sundarban Mangrove forest is highly productive marine ecosystem where halophilic microbes actively participate in bio-mineralization and biotransformation of minerals. The population of aerobic halophilic microbes was studied to determine their distribution with the availability of different physicochemical parameters with increasing depth of this forest sediment. The present study revealed that microbes present in the top soil region were less tolerant to fluctuation in salinity than the middle and bottom segment. Microbes isolated from bottom segment showed higher growth rate in anaerobic condition. A decreasing trend of total microbial population and organic carbon content of soil were found with increase in depth. In contrary a reverse profile was found for salinity. A significant stratification was found to exist among microbial population and the salty nature of the soil of Sundarban Mangrove forest.
Highlights
Some studies investigated the impacts of soil salinization on the microbial community and found that increasing salt levels had a significant negative impact on microbial populations
After extraction of soil from 3 distinct zones with phosphate buffer solution (PBS), inoculations with 0.1 ml were done into Marine Agar 2216 medium and they were allowed to grow separately in aerobic and anaerobic condition
Microbes isolated from top segment was found to show maximum growth rate when they were allowed to grow in aerobic condition
Summary
Some studies investigated the impacts of soil salinization on the microbial community and found that increasing salt levels had a significant negative impact on microbial populations. S. Das et al / Open Journal of Ecology 1 (2011) 35-40 reduction, methane production, de-nitrification were the important processes for the terminal electron removal during decomposition of organic matter in anoxic environment. Methanotrophs are a subset of a physiological group of bacteria known as methylotrophs They are unique in their ability to utilize methane as a source of carbon and energy [13]. Halophilic bacteria are believed to be predominant in this ecosystem It serves as important source of food for a variety of marine organisms and maintains pristine nature of the environment. It acts as a biological mediator through their involvement in the bio-geochemical process [17]. In the present study an attempt has been taken to explore the vertical distribution of microbial population along with different physicochemical parameters of the soil and their response to fluctuation in salinity and availability of O2
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