Distribution of actinobacteria in the near shore estuarine sediments along north coastal Andhra Pradesh, India
Abstract
The distribution of actinobacteria in the near shore sediments of eight estuaries in the north coastal Andhra Pradesh was investigated in relation to physic-chemical parameters during May 2015 to May 2016. Eleven media were used to culture the actinobacteria. The study recorded 11 genera (Actinomyces, Actinoplanes, Kibdellosprangium, Microbispora, Micromonospora, Microtetraspora, Saccharomonospora, Saccharopolyspora, Streptomyces, Streptosporangium and Thermomonospora) of actinobactera. The study registered the occurrence of 143 species of Streptomyces of which, 79 species were recorded at Station 5 (Gosthani estuary). The species S.albus, S.atroolivaceus, S.catenulae, S.griseus, S.olivaceous, S.bellus and S.psammoticus are common species. Forty species were recorded only once during the study period. The mean densities of Actinobacteria and the genus Streptomyces at Station 5 (Gosthani estuary) were 36 x 10² cfu/g and 29 x 10² cfu/g respectively. The medium Glucose Asparagine Agar supported maximum number of (6) actionobacteria genera. The ISP 3 medium (Oat Meal Agar) harboured maximum number (27) of Streptomyces species. Majority (8) of the media supported Streptomyces albus. Species diversity indices (Simpson’s Index D : 0.513 to 0.643; Shannon’s Index: 0.755 to 1.3; Margalef’s Index :0.303 to 1.058) values were calculated. Four species exhibited moderate antibacterial activity. The distribution of actinobacvteria is discussed in relation to the physicochemical parameters investigated.
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