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River Ganga has been the source of physical and spiritual sustenance of Indian civilization for millennia. Counted among the major riverine wonders of the world, it is a mega diverse ecosystem that is home to a wide variety of relic species from the tiny and microscopic to macroscopic forms from planktonic to benthic and free floating to submerged macrophytes. It is a hierarchical system of more than 2,000 biological forms, out of which more than 1,600 are the forms at 1st, 2nd and 3rd trophic levels. This book, based on extensive ecological analyses carried out for the preparation of the...