Use of Hierarchical Diversity Indices in Lotic Community Analysis

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Abstract
Data from 5 macroinvertebrate communities, known to be affected by limestone strip mining, were analyzed with a taxonomic based hierarchical diversity index (HDI), calculated for 3 taxonomic levels. Results from these analyses indicate that identification of organisms to the family level would have sufficed to detect inter-site diversity differences. The advantages and disadvantages of employing the HDI are discussed. Studies that employ diversity indices should use the HDI, as more information can be obtained. A trophic based hierarchical index (HTDI) was also employed to determine its ecological value in lotic community analysis. Stream ecosystems form a continuum from headwater tributaries to downstream rivers, and the structure of biological communities within the system shifts in response to the input of light and particulate organic matter. The advantages and disadvantages of employing the HTDI are discussed.