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Assessing diversity indices for the macroinvertebrates in the tidal mudflat of Hana Char in the Sunderbans, WB, India

Author Affiliations

  • 119, Raj Krishna Pal Lane, Kolkata–700 075, India

Int. Res. J. Environment Sci., Volume 10, Issue (3), Pages 39-46, July,22 (2021)

Abstract

Shannon-Wiener diversity index is undoubtedly the best choice for the estimation of diversity indices of a particular ecological community among several such conventional indices like Margalef index or Magurran index used by the researchers in the field of applied forest ecology, marine ecology, or brackish water ecology in the estuarine environment though the Margalef index and Magurran index categorically state about species richness indices sensitive to abundance based sampling of species. And after application of all these indices for the estimation of diversity index for the macro-invertebrates identified and sampled at a tidal mudflat of Hana Char in the estuarine environment of the world famous mangrove ecosystem of the Sunderbans, the obtained values show completely different results like the values of Shannon-Wiener diversity index 0.74, Margalef diversity index 1.066, and Magurran diversity index 0.30 because of their sensitiveness to the presence-absence based data and abundance based data of the sample populations. For obtaining such different diversity indices values, a thorough literature search has been conducted for finding a modified combined form or reformulated version of the Margalef diversity index and the Magurran diversity index that will be befitted for the better interpretation of the diversity indices in broader aspects and shows similarity in values with that of the Shannon-Wiener Index. Finding out no such scientific literatures related to the combined formulas of these indices, an attempt has been taken to reformulate the diversity indices measurement combining and modifying both Margalef diversity index and Magurran diversity index which are well-known as species richness indices in the field of applied ecology. The estimated value 0.72 for the macroinvertebrates of Hana Char applying the modified and reformulated version for measuring diversity indices is remarkably close to the value 0.74 obtained from the Shannon-Wiener diversity index which might be used for the estimation of diversity indices in a particular ecological community and might be compared with the index’s values of the Shannon-Wiener index.

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