Abstract
Bacterial diversity in solar salterns and a simulated solar saltern under laboratory conditions was studied. The two systems were compared at the pre-salt harvesting phase and salt harvesting phase using Denaturing Gradient Gel Electrophoresis (DGGE). Bacterial composition was dominated by Gammaproteobacteria and more specifically with members of Alteromonas, Vibrio, Pseudomonas, Tolumonas, Marinobacter, Pseudoalteromonas and novel uncultured bacteria. The Shannon–Weaver index (H), Simpson diversity index (D) and Equitability index (E) values showed that salterns can support a wide range of microbes during the pre-salt harvesting phase (3–4 % salinity) when compared to the salt harvesting phase (21–29 % salinity). Range-weighted richness (Rr) values indicated that solar salterns are habitable only by a limited group of microbes as they have medium richness, indicated by physico-chemical characteristics. Principal Coordinate Analysis (PCO) of the simulated study showed a variation in diversity at a large scale with increase in salinity. Solar salterns as well as the simulated tank showed more diversity during the pre-salt harvesting phase.
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