Fig. 3: Boxplot of Shannon and Simpson’s diversity indices with 95% confidence interval error bars, characterizing the richness and evenness of ASVs that were present on Phra Thong Island and at Cuddalore.
From: Environmental DNA signatures distinguish between tsunami and storm deposition in overwash sand
Shannon and Simpson diversity indices indicate that the richness and evenness of ASVs on Phra Thong Island were higher than at Cuddalore. Marine sediments have the highest diversity compared to other sample types (intertidal, beach, overwash deposits and intercalating soil and terrestrial samples) at both locations, followed by the beach and intertidal sand. Backdune samples from Cuddalore and swale samples from Phra Thong have relatively lower diversity than the marine and beach samples at both locations. On Phra Thong Island, the 2007 storm and 2004 IOT deposits have relatively higher diversity compared to the soils above and below the two event deposits. In contrast, Cyclone Thane and the 2004 IOT deposits at Cuddalore have the lowest diversity compared to other sediment samples collected at the same study location.
