ABSTRACT:We assessed the Shannon Weiner species diversity index of true mangroves in Indian Sundarbans during 2000, 2006 and 2012 considering the natural-cum-anthropogenic threats along with conservation strategies operating in and around the ten selected sampling stations. Our analysis revealed pronounced spatio-temporal variations, which may be attributed primarily due to anthropogenic pressure that is more predominant in stations like Canning, Harinbari, Chemaguri and Sagar south. The adverse impact of hypersalinity on the diversity of true mangroves also surfaced out from this first order analysis.