Abstract
Natural variability in diversity of benthic macro invertebrate fauna or benthos has become a valuable tool in assessing, modeling and monitoring of water quality of inland water body with respect to its portability and of pollution level. However, inappropriate use of these indices may leads to false interpretation or prediction of behavior of inland water body. In this study we have employed two normalizing (i.e Shannon-Wiener Index (H’), Pielou´s Evenness (J’)) and one probability type (HurlbertPIE Index(PIE)) indices to evaluate behavior of Baikona tank water body between Jan-2008 to Dec 2009.Sampling was carried out for period of 24 months at three different location and diversity of benthos for each location was tabulated.
 It is observed that monthly variation these indices show same trend during observation period. Coefficient of correlation among normalizing indices is observed lesser degree when compared to correlation between normalizing and probability type index. Degree of correlation is equitable when samples in all three sampling stations are mapped as single for each sampling period. It can be summarized that to model the tank behavior (i)both normalizing type and probabilistic type indices to be considered.(ii)all samples taken at a time at different locations are to be mapped as single sample.
Highlights
Environmental pollution becomes primary concern worldwide due to increasingly deteriorating environmental condition
Benthos is group of organisms which found in fresh water bodies and known to be highly sensitive to environmental changes
The three diversity indices chosen for correlation study are : the Shannon-Wiener Index(H’), the and Pielous Evenness(J’ ),Hurlbert Index(SHPIE).These three were chosen because first two are normalizing indices whereas last one is probability index
Summary
Environmental pollution becomes primary concern worldwide due to increasingly deteriorating environmental condition. Benthos is group of organisms which found in fresh water bodies and known to be highly sensitive to environmental changes. Due to this characteristic assessment of benthos diversity with time, gives a faire indication of water bodies getting polluted or not. Like Shannon-Wiener Index (H’) and Pielous Evenness (J’) as assessment of normalized diversity and more dependent on sample size while Hurlbert Index (SHPIE) can be used as probabilistic indices and less dependent on sample size. The three diversity indices chosen for correlation study are : the Shannon-Wiener Index(H’), the and Pielous Evenness(J’ ),Hurlbert Index(SHPIE).These three were chosen because first two are normalizing indices whereas last one is probability index. The SH Hurlbert PIE represents the probability of interaction between species
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